id
The id attribute identifies this element with a given name in the DOM tree.
Details
- There are two ways to identify elements in the page: document.getNodeById(<elementId>) and document.<elementId> where <elementId> is the id attribute of an element.
- document.getNodeById(<elementId>) searchs the DOM tree to find the first occurrence (highest order) of any element with id equal to <elementId>.
- document.<elementId> is a "short cut" to identify Parent Elements directly under the jin element and Display Elements directly under a page row element. Given multiple elements with id equal to <elementId>, this identifies the last occurence (lowest order) of the element in the DOM tree.
- document.<elementId> is the faster method to identify an element. It should be used in place of document.getNodeById(<elementId>) where possible.
Example
<script>
function findTheNode() {
var node = document.getNodeById('testId');
// this alerts "text" to the screen
alert(node.value);
var node2 = document.testId;
// this alerts "Press Me" to the screen
alert(node2.value);
}
</script>
<body>
<pr>
<text id="testId" value="text">Some text</text>
</pr>
<pr>
<input type="button" value="Press Me" id="testId" onselect="findTheNode()" />
</pr>
</body>
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