JavaScript DOM HTML method: getAttribute()
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The getAttribute() method (when applied to
HTML
elements in the JavaScript
DOM) returns
the value of the specified attribute.
It
has the following syntax with the following parameters. It returns a String
representing the value of the specified attribute. If the attribute does not
exist then the return value will be null
or an empty string, i.e. "".
element.getAttribute(attributename)
|
Parameter
|
Required / Optional
|
Description
|
|
attributename
|
Required
|
String containing name
of attribute
|
EXAMPLE:
HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head></head>
<body>
<span id="element"></span><br>
<span id="element2"></span>
<script>
var x2 = document.createElement("CANVAS");
x2.setAttribute("width","150");
x2.setAttribute("height","70");
x2.setAttribute("style","border: 1px solid black");
var c2 = x2.getContext("2d");
c2.fillStyle = "blue";
c2.font = "40px Verdana";
c2.shadowBlur = "4";
c2.shadowColor = "red";
c2.shadowOffsetX = "2";
c2.shadowOffsetY = "3";
c2.fillText("Hello", 10, 50);
document.getElementById("element").appendChild(x2);
var a = x2.attributes;
var ct = a.length;
document.getElementById("element2").innerHTML =
"Has attributes? " + x2.hasAttributes() + "<br>" +
"Has width attribute? " + x2.hasAttribute("width") + "<br>" +
"Width attribute using getAttribute = " + x2.getAttribute("width") + "<br>" +
"Number of attributes = " + ct + ", i.e.:<br>" +
" " + a[0].name + " = " + a[0].value + "<br>" +
" " + a[1].name + " = " + a[1].value + "<br>" +
" " + a[2].name + " = " + a[2].value + "<br>";
</script>
</body>
</html>
|
FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodDomHtmlGetAttribute() {
var z = document.createElement("TABLE"); return !!z.getAttribute;
} |
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