Class HTMLDocument
- java.lang.Object
-
- javax.swing.text.AbstractDocument
-
- javax.swing.text.DefaultStyledDocument
-
- javax.swing.text.html.HTMLDocument
- All Implemented Interfaces:
-
Serializable
,Document
,StyledDocument
public class HTMLDocument extends DefaultStyledDocument
A document that models HTML. The purpose of this model is to support both browsing and editing. As a result, the structure described by an HTML document is not exactly replicated by default. The element structure that is modeled by default, is built by the class HTMLDocument.HTMLReader
, which implements the HTMLEditorKit.ParserCallback
protocol that the parser expects. To change the structure one can subclass HTMLReader
, and reimplement the method getReader(int)
to return the new reader implementation. The documentation for HTMLReader
should be consulted for the details of the default structure created. The intent is that the document be non-lossy (although reproducing the HTML format may result in a different format).
The document models only HTML, and makes no attempt to store view attributes in it. The elements are identified by the StyleContext.NameAttribute
attribute, which should always have a value of type HTML.Tag
that identifies the kind of element. Some of the elements (such as comments) are synthesized. The HTMLFactory
uses this attribute to determine what kind of view to build.
This document supports incremental loading. The TokenThreshold
property controls how much of the parse is buffered before trying to update the element structure of the document. This property is set by the EditorKit
so that subclasses can disable it.
The Base
property determines the URL against which relative URLs are resolved. By default, this will be the Document.StreamDescriptionProperty
if the value of the property is a URL. If a <BASE> tag is encountered, the base will become the URL specified by that tag. Because the base URL is a property, it can of course be set directly.
The default content storage mechanism for this document is a gap buffer (GapContent
). Alternatives can be supplied by using the constructor that takes a Content
implementation.
Modifying HTMLDocument
In addition to the methods provided by Document and StyledDocument for mutating an HTMLDocument, HTMLDocument provides a number of convenience methods. The following methods can be used to insert HTML content into an existing document.
setInnerHTML(Element, String)
setOuterHTML(Element, String)
insertBeforeStart(Element, String)
insertAfterStart(Element, String)
insertBeforeEnd(Element, String)
insertAfterEnd(Element, String)
The following examples illustrate using these methods. Each example assumes the HTML document is initialized in the following way:
JEditorPane p = new JEditorPane(); p.setContentType("text/html"); p.setText("..."); // Document text is provided below. HTMLDocument d = (HTMLDocument) p.getDocument();
With the following HTML content:
<html> <head> <title>An example HTMLDocument</title> <style type="text/css"> div { background-color: silver; } ul { color: blue; } </style> </head> <body> <div id="BOX"> <p>Paragraph 1</p> <p>Paragraph 2</p> </div> </body> </html>
All the methods for modifying an HTML document require an Element
. Elements can be obtained from an HTML document by using the method getElement(Element e, Object attribute, Object
value)
. It returns the first descendant element that contains the specified attribute with the given value, in depth-first order. For example, d.getElement(d.getDefaultRootElement(),
StyleConstants.NameAttribute, HTML.Tag.P)
returns the first paragraph element.
A convenient shortcut for locating elements is the method getElement(String)
; returns an element whose ID
attribute matches the specified value. For example, d.getElement("BOX")
returns the DIV
element.
The getIterator(HTML.Tag t)
method can also be used for finding all occurrences of the specified HTML tag in the document.
Inserting elements
Elements can be inserted before or after the existing children of any non-leaf element by using the methods insertAfterStart
and insertBeforeEnd
. For example, if e
is the DIV
element, d.insertAfterStart(e, "<ul><li>List
Item</li></ul>")
inserts the list before the first paragraph, and d.insertBeforeEnd(e, "<ul><li>List
Item</li></ul>")
inserts the list after the last paragraph. The DIV
block becomes the parent of the newly inserted elements.
Sibling elements can be inserted before or after any element by using the methods insertBeforeStart
and insertAfterEnd
. For example, if e
is the DIV
element, d.insertBeforeStart(e,
"<ul><li>List Item</li></ul>")
inserts the list before the DIV
element, and d.insertAfterEnd(e,
"<ul><li>List Item</li></ul>")
inserts the list after the DIV
element. The newly inserted elements become siblings of the DIV
element.
Replacing elements
Elements and all their descendants can be replaced by using the methods setInnerHTML
and setOuterHTML
. For example, if e
is the DIV
element, d.setInnerHTML(e, "<ul><li>List
Item</li></ul>")
replaces all children paragraphs with the list, and d.setOuterHTML(e, "<ul><li>List
Item</li></ul>")
replaces the DIV
element itself. In latter case the parent of the list is the BODY
element.
Summary
The following table shows the example document and the results of various methods described above.
Example | insertAfterStart | insertBeforeEnd | insertBeforeStart | insertAfterEnd | setInnerHTML | setOuterHTML |
---|---|---|---|---|---|---|
Paragraph 1 Paragraph 2 |
Paragraph 1 Paragraph 2 | Paragraph 1 Paragraph 2
|
Paragraph 1 Paragraph 2 | Paragraph 1 Paragraph 2
|
|
|
Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans™ has been added to the java.beans
package. Please see XMLEncoder
.
- See Also:
- Serialized Form
Nested Class Summary
Modifier and Type | Class | Description |
---|---|---|
class | HTMLDocument.BlockElement | An element that represents a structural block of HTML. |
class | HTMLDocument.HTMLReader | An HTML reader to load an HTML document with an HTML element structure. |
static class | HTMLDocument.Iterator | An iterator to iterate over a particular type of tag. |
class | HTMLDocument.RunElement | An element that represents a chunk of text that has a set of HTML character level attributes assigned to it. |
Nested classes/interfaces declared in class javax.swing.text.DefaultStyledDocument
DefaultStyledDocument.AttributeUndoableEdit, DefaultStyledDocument.ElementBuffer, DefaultStyledDocument.ElementSpec, DefaultStyledDocument.SectionElement
Nested classes/interfaces declared in class javax.swing.text.AbstractDocument
AbstractDocument.AbstractElement, AbstractDocument.AttributeContext, AbstractDocument.BranchElement, AbstractDocument.Content, AbstractDocument.DefaultDocumentEvent, AbstractDocument.ElementEdit, AbstractDocument.LeafElement
Field Summary
Modifier and Type | Field | Description |
---|---|---|
static String | AdditionalComments | Document property key value. |
Fields declared in class javax.swing.text.DefaultStyledDocument
buffer, BUFFER_SIZE_DEFAULT
Fields declared in class javax.swing.text.AbstractDocument
BAD_LOCATION, BidiElementName, ContentElementName, ElementNameAttribute, listenerList, ParagraphElementName, SectionElementName
Fields declared in interface javax.swing.text.Document
StreamDescriptionProperty, TitleProperty
Constructor Summary
Constructor | Description |
---|---|
HTMLDocument() | Constructs an HTML document using the default buffer size and a default |
HTMLDocument(AbstractDocument.Content c,
StyleSheet styles) | Constructs an HTML document with the given content storage implementation and the given style/attribute storage mechanism. |
HTMLDocument(StyleSheet styles) | Constructs an HTML document with the default content storage implementation and the specified style/attribute storage mechanism. |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
protected void | create(DefaultStyledDocument.ElementSpec[] data) | Replaces the contents of the document with the given element specifications. |
protected Element | createBranchElement(Element parent,
AttributeSet a) | Creates a document branch element, that can contain other elements. |
protected AbstractDocument.AbstractElement | createDefaultRoot() | Creates the root element to be used to represent the default document structure. |
protected Element | createLeafElement(Element parent,
AttributeSet a,
int p0,
int p1) | Creates a document leaf element that directly represents text (doesn't have any children). |
protected void | fireChangedUpdate(DocumentEvent e) | Notifies all listeners that have registered interest for notification on this event type. |
protected void | fireUndoableEditUpdate(UndoableEditEvent e) | Notifies all listeners that have registered interest for notification on this event type. |
URL | getBase() | Returns the location to resolve relative URLs against. |
Element | getElement(String id) | Returns the element that has the given id |
Element | getElement(Element e,
Object attribute,
Object value) | Returns the child element of |
HTMLDocument.Iterator | getIterator(HTML.Tag t) | Fetches an iterator for the specified HTML tag. |
HTMLEditorKit.Parser | getParser() | Returns the parser that is used when inserting HTML into the existing document. |
boolean | getPreservesUnknownTags() | Returns the behavior the parser observes when encountering unknown tags. |
HTMLEditorKit.ParserCallback | getReader(int pos) | Fetches the reader for the parser to use when loading the document with HTML. |
HTMLEditorKit.ParserCallback | getReader(int pos,
int popDepth,
int pushDepth,
HTML.Tag insertTag) | Returns the reader for the parser to use to load the document with HTML. |
StyleSheet | getStyleSheet() | Fetches the |
int | getTokenThreshold() | Gets the number of tokens to buffer before trying to update the documents element structure. |
protected void | insert(int offset,
DefaultStyledDocument.ElementSpec[] data) | Inserts new elements in bulk. |
void | insertAfterEnd(Element elem,
String htmlText) | Inserts the HTML specified as a string after the end of the given element. |
void | insertAfterStart(Element elem,
String htmlText) | Inserts the HTML specified as a string at the start of the element. |
void | insertBeforeEnd(Element elem,
String htmlText) | Inserts the HTML specified as a string at the end of the element. |
void | insertBeforeStart(Element elem,
String htmlText) | Inserts the HTML specified as a string before the start of the given element. |
protected void | insertUpdate(AbstractDocument.DefaultDocumentEvent chng,
AttributeSet attr) | Updates document structure as a result of text insertion. |
void | processHTMLFrameHyperlinkEvent(HTMLFrameHyperlinkEvent e) | Processes |
void | setBase(URL u) | Sets the location to resolve relative URLs against. |
void | setInnerHTML(Element elem,
String htmlText) | Replaces the children of the given element with the contents specified as an HTML string. |
void | setOuterHTML(Element elem,
String htmlText) | Replaces the given element in the parent with the contents specified as an HTML string. |
void | setParagraphAttributes(int offset,
int length,
AttributeSet s,
boolean replace) | Sets attributes for a paragraph. |
void | setParser(HTMLEditorKit.Parser parser) | Sets the parser that is used by the methods that insert html into the existing document, such as |
void | setPreservesUnknownTags(boolean preservesTags) | Determines how unknown tags are handled by the parser. |
void | setTokenThreshold(int n) | Sets the number of tokens to buffer before trying to update the documents element structure. |
Methods declared in class javax.swing.text.DefaultStyledDocument
addDocumentListener, addStyle, getBackground, getCharacterElement, getDefaultRootElement, getFont, getForeground, getLogicalStyle, getParagraphElement, getStyle, getStyleNames, removeDocumentListener, removeElement, removeStyle, removeUpdate, setCharacterAttributes, setLogicalStyle, styleChanged
Methods declared in class javax.swing.text.AbstractDocument
addUndoableEditListener, createPosition, dump, fireInsertUpdate, fireRemoveUpdate, getAsynchronousLoadPriority, getAttributeContext, getBidiRootElement, getContent, getCurrentWriter, getDocumentFilter, getDocumentListeners, getDocumentProperties, getEndPosition, getLength, getListeners, getProperty, getRootElements, getStartPosition, getText, getText, getUndoableEditListeners, insertString, postRemoveUpdate, putProperty, readLock, readUnlock, remove, removeUndoableEditListener, render, replace, setAsynchronousLoadPriority, setDocumentFilter, setDocumentProperties, writeLock, writeUnlock
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods declared in interface javax.swing.text.Document
addUndoableEditListener, createPosition, getEndPosition, getLength, getProperty, getRootElements, getStartPosition, getText, getText, insertString, putProperty, remove, removeUndoableEditListener, render
Field Detail
AdditionalComments
public static final String AdditionalComments
Document property key value. The value for the key will be a Vector of Strings that are comments not found in the body.
- See Also:
- Constant Field Values
Constructor Detail
HTMLDocument
public HTMLDocument()
Constructs an HTML document using the default buffer size and a default StyleSheet
. This is a convenience method for the constructor HTMLDocument(Content, StyleSheet)
.
HTMLDocument
public HTMLDocument(StyleSheet styles)
Constructs an HTML document with the default content storage implementation and the specified style/attribute storage mechanism. This is a convenience method for the constructor HTMLDocument(Content, StyleSheet)
.
- Parameters:
-
styles
- the styles
HTMLDocument
public HTMLDocument(AbstractDocument.Content c, StyleSheet styles)
Constructs an HTML document with the given content storage implementation and the given style/attribute storage mechanism.
- Parameters:
-
c
- the container for the content -
styles
- the styles
Method Detail
getReader
public HTMLEditorKit.ParserCallback getReader(int pos)
Fetches the reader for the parser to use when loading the document with HTML. This is implemented to return an instance of HTMLDocument.HTMLReader
. Subclasses can reimplement this method to change how the document gets structured if desired. (For example, to handle custom tags, or structurally represent character style elements.)
- Parameters:
-
pos
- the starting position - Returns:
- the reader used by the parser to load the document
getReader
public HTMLEditorKit.ParserCallback getReader(int pos, int popDepth, int pushDepth, HTML.Tag insertTag)
Returns the reader for the parser to use to load the document with HTML. This is implemented to return an instance of HTMLDocument.HTMLReader
. Subclasses can reimplement this method to change how the document gets structured if desired. (For example, to handle custom tags, or structurally represent character style elements.)
This is a convenience method for getReader(int, int, int, HTML.Tag, TRUE)
.
- Parameters:
-
pos
- the starting position -
popDepth
- the number ofElementSpec.EndTagTypes
to generate before inserting -
pushDepth
- the number ofElementSpec.StartTagTypes
with a direction ofElementSpec.JoinNextDirection
that should be generated before inserting, but after the end tags have been generated -
insertTag
- the first tag to start inserting into document - Returns:
- the reader used by the parser to load the document
getBase
public URL getBase()
Returns the location to resolve relative URLs against. By default this will be the document's URL if the document was loaded from a URL. If a base tag is found and can be parsed, it will be used as the base location.
- Returns:
- the base location
setBase
public void setBase(URL u)
Sets the location to resolve relative URLs against. By default this will be the document's URL if the document was loaded from a URL. If a base tag is found and can be parsed, it will be used as the base location.
This also sets the base of the StyleSheet
to be u
as well as the base of the document.
- Parameters:
-
u
- the desired base URL
insert
protected void insert(int offset, DefaultStyledDocument.ElementSpec[] data) throws BadLocationException
Inserts new elements in bulk. This is how elements get created in the document. The parsing determines what structure is needed and creates the specification as a set of tokens that describe the edit while leaving the document free of a write-lock. This method can then be called in bursts by the reader to acquire a write-lock for a shorter duration (i.e. while the document is actually being altered).
- Overrides:
-
insert
in classDefaultStyledDocument
- Parameters:
-
offset
- the starting offset -
data
- the element data - Throws:
-
BadLocationException
- if the given position does not represent a valid location in the associated document.
insertUpdate
protected void insertUpdate(AbstractDocument.DefaultDocumentEvent chng, AttributeSet attr)
Updates document structure as a result of text insertion. This will happen within a write lock. This implementation simply parses the inserted content for line breaks and builds up a set of instructions for the element buffer.
- Overrides:
-
insertUpdate
in classDefaultStyledDocument
- Parameters:
-
chng
- a description of the document change -
attr
- the attributes
create
protected void create(DefaultStyledDocument.ElementSpec[] data)
Replaces the contents of the document with the given element specifications. This is called before insert if the loading is done in bursts. This is the only method called if loading the document entirely in one burst.
- Overrides:
-
create
in classDefaultStyledDocument
- Parameters:
-
data
- the new contents of the document
setParagraphAttributes
public void setParagraphAttributes(int offset, int length, AttributeSet s, boolean replace)
Sets attributes for a paragraph.
This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.
- Specified by:
-
setParagraphAttributes
in interfaceStyledDocument
- Overrides:
-
setParagraphAttributes
in classDefaultStyledDocument
- Parameters:
-
offset
- the offset into the paragraph (must be at least 0) -
length
- the number of characters affected (must be at least 0) -
s
- the attributes -
replace
- whether to replace existing attributes, or merge them
getStyleSheet
public StyleSheet getStyleSheet()
Fetches the StyleSheet
with the document-specific display rules (CSS) that were specified in the HTML document itself.
- Returns:
- the
StyleSheet
getIterator
public HTMLDocument.Iterator getIterator(HTML.Tag t)
Fetches an iterator for the specified HTML tag. This can be used for things like iterating over the set of anchors contained, or iterating over the input elements.
- Parameters:
-
t
- the requestedHTML.Tag
- Returns:
- the
Iterator
for the given HTML tag - See Also:
HTML.Tag
createLeafElement
protected Element createLeafElement(Element parent, AttributeSet a, int p0, int p1)
Creates a document leaf element that directly represents text (doesn't have any children). This is implemented to return an element of type HTMLDocument.RunElement
.
- Overrides:
-
createLeafElement
in classAbstractDocument
- Parameters:
-
parent
- the parent element -
a
- the attributes for the element -
p0
- the beginning of the range (must be at least 0) -
p1
- the end of the range (must be at least p0) - Returns:
- the new element
createBranchElement
protected Element createBranchElement(Element parent, AttributeSet a)
Creates a document branch element, that can contain other elements. This is implemented to return an element of type HTMLDocument.BlockElement
.
- Overrides:
-
createBranchElement
in classAbstractDocument
- Parameters:
-
parent
- the parent element -
a
- the attributes - Returns:
- the element
createDefaultRoot
protected AbstractDocument.AbstractElement createDefaultRoot()
Creates the root element to be used to represent the default document structure.
- Overrides:
-
createDefaultRoot
in classDefaultStyledDocument
- Returns:
- the element base
setTokenThreshold
public void setTokenThreshold(int n)
Sets the number of tokens to buffer before trying to update the documents element structure.
- Parameters:
-
n
- the number of tokens to buffer
getTokenThreshold
public int getTokenThreshold()
Gets the number of tokens to buffer before trying to update the documents element structure. The default value is Integer.MAX_VALUE
.
- Returns:
- the number of tokens to buffer
setPreservesUnknownTags
public void setPreservesUnknownTags(boolean preservesTags)
Determines how unknown tags are handled by the parser. If set to true, unknown tags are put in the model, otherwise they are dropped.
- Parameters:
-
preservesTags
- true if unknown tags should be saved in the model, otherwise tags are dropped - See Also:
HTML.Tag
getPreservesUnknownTags
public boolean getPreservesUnknownTags()
Returns the behavior the parser observes when encountering unknown tags.
- Returns:
- true if unknown tags are to be preserved when parsing
- See Also:
HTML.Tag
processHTMLFrameHyperlinkEvent
public void processHTMLFrameHyperlinkEvent(HTMLFrameHyperlinkEvent e)
Processes HyperlinkEvents
that are generated by documents in an HTML frame. The HyperlinkEvent
type, as the parameter suggests, is HTMLFrameHyperlinkEvent
. In addition to the typical information contained in a HyperlinkEvent
, this event contains the element that corresponds to the frame in which the click happened (the source element) and the target name. The target name has 4 possible values:
- _self
- _parent
- _top
- a named frame
HTML.Attribute.SRC
attribute and fires a ChangedUpdate
event.
If the target is _parent, then it deletes the parent element, which is a <FRAMESET> element, and inserts a new <FRAME> element, and sets its HTML.Attribute.SRC
attribute to have a value equal to the destination URL and fire a RemovedUpdate
and InsertUpdate
.
If the target is _top, this method does nothing. In the implementation of the view for a frame, namely the FrameView
, the processing of _top is handled. Given that _top implies replacing the entire document, it made sense to handle this outside of the document that it will replace.
If the target is a named frame, then the element hierarchy is searched for an element with a name equal to the target, its HTML.Attribute.SRC
attribute is updated and a ChangedUpdate
event is fired.
- Parameters:
-
e
- the event
setParser
public void setParser(HTMLEditorKit.Parser parser)
Sets the parser that is used by the methods that insert html into the existing document, such as setInnerHTML
, and setOuterHTML
.
HTMLEditorKit.createDefaultDocument
will set the parser for you. If you create an HTMLDocument
by hand, be sure and set the parser accordingly.
- Parameters:
-
parser
- the parser to be used for text insertion - Since:
- 1.3
getParser
public HTMLEditorKit.Parser getParser()
Returns the parser that is used when inserting HTML into the existing document.
- Returns:
- the parser used for text insertion
- Since:
- 1.3
setInnerHTML
public void setInnerHTML(Element elem, String htmlText) throws BadLocationException, IOException
Replaces the children of the given element with the contents specified as an HTML string.
This will be seen as at least two events, n inserts followed by a remove.
Consider the following structure (the elem
parameter is in bold).
<body> | <div> / \ <p> <p>
Invoking setInnerHTML(elem, "<ul><li>")
results in the following structure (new elements are in blue).
<body> | <div> \ <ul> \ <li>
Parameter elem
must not be a leaf element, otherwise an IllegalArgumentException
is thrown. If either elem
or htmlText
parameter is null
, no changes are made to the document.
For this to work correctly, the document must have an HTMLEditorKit.Parser
set. This will be the case if the document was created from an HTMLEditorKit via the createDefaultDocument
method.
- Parameters:
-
elem
- the branch element whose children will be replaced -
htmlText
- the string to be parsed and assigned toelem
- Throws:
-
IllegalArgumentException
- ifelem
is a leaf -
IllegalStateException
- if anHTMLEditorKit.Parser
has not been defined -
BadLocationException
- if replacement is impossible because of a structural issue -
IOException
- if an I/O exception occurs - Since:
- 1.3
setOuterHTML
public void setOuterHTML(Element elem, String htmlText) throws BadLocationException, IOException
Replaces the given element in the parent with the contents specified as an HTML string.
This will be seen as at least two events, n inserts followed by a remove.
When replacing a leaf this will attempt to make sure there is a newline present if one is needed. This may result in an additional element being inserted. Consider, if you were to replace a character element that contained a newline with <img> this would create two elements, one for the image, and one for the newline.
If you try to replace the element at length you will most likely end up with two elements, eg setOuterHTML(getCharacterElement (getLength()),
"blah")
will result in two leaf elements at the end, one representing 'blah', and the other representing the end element.
Consider the following structure (the elem
parameter is in bold).
<body> | <div> / \ <p> <p>
Invoking setOuterHTML(elem, "<ul><li>")
results in the following structure (new elements are in blue).
<body> | <ul> \ <li>
If either elem
or htmlText
parameter is null
, no changes are made to the document.
For this to work correctly, the document must have an HTMLEditorKit.Parser set. This will be the case if the document was created from an HTMLEditorKit via the createDefaultDocument
method.
- Parameters:
-
elem
- the element to replace -
htmlText
- the string to be parsed and inserted in place ofelem
- Throws:
-
IllegalStateException
- if an HTMLEditorKit.Parser has not been set -
BadLocationException
- if replacement is impossible because of a structural issue -
IOException
- if an I/O exception occurs - Since:
- 1.3
insertAfterStart
public void insertAfterStart(Element elem, String htmlText) throws BadLocationException, IOException
Inserts the HTML specified as a string at the start of the element.
Consider the following structure (the elem
parameter is in bold).
<body> | <div> / \ <p> <p>
Invoking insertAfterStart(elem,
"<ul><li>")
results in the following structure (new elements are in blue).
<body> | <div> / | \ <ul> <p> <p> / <li>
Unlike the insertBeforeStart
method, new elements become children of the specified element, not siblings.
Parameter elem
must not be a leaf element, otherwise an IllegalArgumentException
is thrown. If either elem
or htmlText
parameter is null
, no changes are made to the document.
For this to work correctly, the document must have an HTMLEditorKit.Parser
set. This will be the case if the document was created from an HTMLEditorKit via the createDefaultDocument
method.
- Parameters:
-
elem
- the branch element to be the root for the new text -
htmlText
- the string to be parsed and assigned toelem
- Throws:
-
IllegalArgumentException
- ifelem
is a leaf -
IllegalStateException
- if an HTMLEditorKit.Parser has not been set on the document -
BadLocationException
- if insertion is impossible because of a structural issue -
IOException
- if an I/O exception occurs - Since:
- 1.3
insertBeforeEnd
public void insertBeforeEnd(Element elem, String htmlText) throws BadLocationException, IOException
Inserts the HTML specified as a string at the end of the element.
If elem
's children are leaves, and the character at a elem.getEndOffset() - 1
is a newline, this will insert before the newline so that there isn't text after the newline.
Consider the following structure (the elem
parameter is in bold).
<body> | <div> / \ <p> <p>
Invoking insertBeforeEnd(elem, "<ul><li>")
results in the following structure (new elements are in blue).
<body> | <div> / | \ <p> <p> <ul> \ <li>
Unlike the insertAfterEnd
method, new elements become children of the specified element, not siblings.
Parameter elem
must not be a leaf element, otherwise an IllegalArgumentException
is thrown. If either elem
or htmlText
parameter is null
, no changes are made to the document.
For this to work correctly, the document must have an HTMLEditorKit.Parser
set. This will be the case if the document was created from an HTMLEditorKit via the createDefaultDocument
method.
- Parameters:
-
elem
- the element to be the root for the new text -
htmlText
- the string to be parsed and assigned toelem
- Throws:
-
IllegalArgumentException
- ifelem
is a leaf -
IllegalStateException
- if an HTMLEditorKit.Parser has not been set on the document -
BadLocationException
- if insertion is impossible because of a structural issue -
IOException
- if an I/O exception occurs - Since:
- 1.3
insertBeforeStart
public void insertBeforeStart(Element elem, String htmlText) throws BadLocationException, IOException
Inserts the HTML specified as a string before the start of the given element.
Consider the following structure (the elem
parameter is in bold).
<body> | <div> / \ <p> <p>
Invoking insertBeforeStart(elem,
"<ul><li>")
results in the following structure (new elements are in blue).
<body> / \ <ul> <div> / / \ <li> <p> <p>
Unlike the insertAfterStart
method, new elements become siblings of the specified element, not children.
If either elem
or htmlText
parameter is null
, no changes are made to the document.
For this to work correctly, the document must have an HTMLEditorKit.Parser
set. This will be the case if the document was created from an HTMLEditorKit via the createDefaultDocument
method.
- Parameters:
-
elem
- the element the content is inserted before -
htmlText
- the string to be parsed and inserted beforeelem
- Throws:
-
IllegalStateException
- if an HTMLEditorKit.Parser has not been set on the document -
BadLocationException
- if insertion is impossible because of a structural issue -
IOException
- if an I/O exception occurs - Since:
- 1.3
insertAfterEnd
public void insertAfterEnd(Element elem, String htmlText) throws BadLocationException, IOException
Inserts the HTML specified as a string after the end of the given element.
Consider the following structure (the elem
parameter is in bold).
<body> | <div> / \ <p> <p>
Invoking insertAfterEnd(elem, "<ul><li>")
results in the following structure (new elements are in blue).
<body> / \ <div> <ul> / \ \ <p> <p> <li>
Unlike the insertBeforeEnd
method, new elements become siblings of the specified element, not children.
If either elem
or htmlText
parameter is null
, no changes are made to the document.
For this to work correctly, the document must have an HTMLEditorKit.Parser
set. This will be the case if the document was created from an HTMLEditorKit via the createDefaultDocument
method.
- Parameters:
-
elem
- the element the content is inserted after -
htmlText
- the string to be parsed and inserted afterelem
- Throws:
-
IllegalStateException
- if an HTMLEditorKit.Parser has not been set on the document -
BadLocationException
- if insertion is impossible because of a structural issue -
IOException
- if an I/O exception occurs - Since:
- 1.3
getElement
public Element getElement(String id)
Returns the element that has the given id Attribute
. If the element can't be found, null
is returned. Note that this method works on an Attribute
, not a character tag. In the following HTML snippet: <a id="HelloThere">
the attribute is 'id' and the character tag is 'a'. This is a convenience method for getElement(RootElement, HTML.Attribute.id, id)
. This is not thread-safe.
- Parameters:
-
id
- the string representing the desiredAttribute
- Returns:
- the element with the specified
Attribute
ornull
if it can't be found, ornull
ifid
isnull
- Since:
- 1.3
- See Also:
HTML.Attribute
getElement
public Element getElement(Element e, Object attribute, Object value)
Returns the child element of e
that contains the attribute, attribute
with value value
, or null
if one isn't found. This is not thread-safe.
- Parameters:
-
e
- the root element where the search begins -
attribute
- the desiredAttribute
-
value
- the values for the specifiedAttribute
- Returns:
- the element with the specified
Attribute
and the specifiedvalue
, ornull
if it can't be found - Since:
- 1.3
- See Also:
HTML.Attribute
fireChangedUpdate
protected void fireChangedUpdate(DocumentEvent e)
Notifies all listeners that have registered interest for notification on this event type. The event instance is lazily created using the parameters passed into the fire method.
- Overrides:
-
fireChangedUpdate
in classAbstractDocument
- Parameters:
-
e
- the event - See Also:
EventListenerList
fireUndoableEditUpdate
protected void fireUndoableEditUpdate(UndoableEditEvent e)
Notifies all listeners that have registered interest for notification on this event type. The event instance is lazily created using the parameters passed into the fire method.
- Overrides:
-
fireUndoableEditUpdate
in classAbstractDocument
- Parameters:
-
e
- the event - See Also:
EventListenerList