?? retrievingtextboxlengthsexample.htm
字號:
<html>
<head>
<title>Retrieving a Textbox Length Example</title>
<script type="text/javascript">
function getLengths() {
var oTextbox1 = document.getElementById("txt1");
var oTextbox2 = document.getElementById("txt2");
alert("The length of txt1 is " + oTextbox1.value.length + "\n"
+ "The length of txt2 is " + oTextbox2.value.length);
}
</script>
</head>
<body>
<input type="text" size="12" id="txt1" /><br />
<textarea rows="5" cols="25" id="txt2"></textarea><br />
<input type="button" value="Get Lengths" onclick="getLengths()" />
</body>
</html>
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