java code 39 barcode The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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When the Check ALT Tags button is clicked, the checkAltTags() function retrieves a list of <IMG> tags in the document using getElementsByTagName() It then uses the getAttribute() method to see if each element has an ALT attribute If it finds an <IMG> tag with no ALT attribute, an alert is displayed containing the name of the image In this example, the fourth image tag has no ALT attribute, so it will be flagged by the code
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Most browsers will let you retrieve the content of an attribute by referring to the attribute s name as a property of a tag (that is, documenttitle or imagesrc) However, using the getAttribute() method is more flexible and is more likely to work across multiple DOM implementations, not just web browsers In addition, some browsers may not properly register custom user-defined attributes as properties of a node, so this notation may not work in those circumstances To be safe, portable, and in tune with the specification, always use getAttribute()
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Creating and Modifying Page Elements
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Creating and modifying document elements in a web browser dynamically is relatively straightforward using the DOM Once you have obtained a reference to the node or list of nodes that you want to modify, you can use the DOM to change attributes, rearrange nodes, or change their content
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Modifying Document Nodes
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To modify an attribute associated with a page element, you can use the setAttribute() and removeAttribute() methods For example, the following code allows the user to set the background color of the document by clicking one of three buttons:
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<HTML> <HEAD> <TITLE>Untitled</TITLE> <SCRIPT> function setBackground(backColor) { var oBody = documentgetElementsByTagName("BODY")item(0); if (backColor == "") oBodyremoveAttribute("bgColor"); else oBodysetAttribute("bgColor",backColor); }
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5: Browsers
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</SCRIPT> </HEAD> <BODY BGCOLOR="#FF0000"> <INPUT TYPE="button" VALUE="Black" onClick="setBackground('Black')"> <INPUT TYPE="button" VALUE="White " onClick="setBackground('White')"> <INPUT TYPE="button" VALUE="Blue " onClick="setBackground('Blue')"> <INPUT TYPE="button" VALUE="Default " onClick="setBackground('')"> </BODY> </HTML>
When one of the buttons representing a color is clicked, the background of the page is changed to that color by setting the BGCOLOR attribute of the <BODY> tag If the Default Background button is clicked, the color of the page is set to whatever the default for the browser is in effect, the BGCOLOR attribute is removed from the <BODY> tag Similarly, block-level items, such as paragraphs and other elements, can be modified by changing attributes For example, to change the alignment of a paragraph, a script only needs to set its align attribute, as shown in the following example:
<HTML> <HEAD> <TITLE>Align Example</TITLE> </HEAD> <BODY> <P ID="para1">Paragraph 1</P> <P> <A HREF="#" ONCLICK="documentgetElementById('para1')setAttribute( 'align','left')">Align Left</A> <A HREF="#" ONCLICK="documentgetElementById('para1')setAttribute( 'align','center')">Align Center</A> <A HREF="#" ONCLICK="documentgetElementById('para1')setAttribute( 'align','right')">Align Right</A> </P> </BODY> </HTML>
This code uses the getElementById() method to retrieve the paragraph node whose ID attribute is para1 When each link is clicked, the align attribute of the paragraph node is set to left, right, or center The results are updated immediately in the browser
The Document Object Model: Processing Structured Documents
In addition to modifying the appearance of a page or its nodes, the content of the nodes themselves can be changed This is accomplished by changing the data property of a given text node The following code is the same as the previous example, but the code has been updated to change the text of the paragraph node with ID para1 Because the first child of the paragraph node is a text node, changing its data property will update the text content
<HTML> <HEAD> <TITLE>Untitled</TITLE> </HEAD> <BODY> <P ID="para1">Click on a link!</P> <P> <A HREF="#" ONCLICK="documentgetElementById('para1')firstChilddata= 'You clicked link 1'">Link 1</A> <A HREF="#" ONCLICK="documentgetElementById('para1')firstChilddata= 'You clicked link 2'">Link 2</A> <A HREF="#" ONCLICK="documentgetElementById('para1')firstChilddata= 'You clicked link 3'">Link 3</A> </P> </BODY> </HTML>
Creating and Removing Document Nodes
Creating nodes at runtime is accomplished by using the DOM s factory methods for creating nodes: the various create() methods of the Document interface, such as createElement(), createTextNode(), and so on Each of these methods creates a new type of node For example, the following code creates new paragraph nodes and appends them to the end of the document s <BODY> tag:
<HTML> <HEAD> <TITLE>Creating New Nodes</TITLE> <SCRIPT> var pCounter = 1; function addParagraph() {
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