cols
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Textarea cols 属性
定义和用法
cols 属性设置或返回文本框的字符列的宽度。
语法
设置 cols 属性:
textareaObject.cols="number"
返回 cols 属性:
textareaObject.cols
值 | 描述 |
---|---|
number | 指定文本框的宽度。默认为20。 |
浏览器支持
所有主流浏览器都支持 cols 属性
实例
下面的例子更改的文本框的宽度:
<html>
<head>
<script>
function displayResult()
{
var textarea=document.getElementById("myTextarea");
textarea.cols=document.getElementById("myInput").value;
}
</script>
</head>
<body>
<textarea id="myTextarea" cols="20">
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</textarea>
<br>
<p>Set cols attribute value: <input type="text" id="myInput" value="60">
<button type="button" onclick="displayResult()">Change cols attribute</button></p>
</body>
</html>
<head>
<script>
function displayResult()
{
var textarea=document.getElementById("myTextarea");
textarea.cols=document.getElementById("myInput").value;
}
</script>
</head>
<body>
<textarea id="myTextarea" cols="20">
At W3CSchool you will find all the Web-building tutorials you need, from basic HTML to advanced XML, SQL, ASP, and PHP.
</textarea>
<br>
<p>Set cols attribute value: <input type="text" id="myInput" value="60">
<button type="button" onclick="displayResult()">Change cols attribute</button></p>
</body>
</html>