js限制文本域输入长度

来源：互联网发布：为什么淘宝商品被下架编辑：程序博客网时间：2024/06/07 06:19

function textCounter(field, countfield, maxlimit)

{

if (field.value.length > maxlimit) // if too long

trim it!

field.value = field.value.substring(0, maxlimit);

// otherwise, update 'characters left' counter

else

countfield.value = maxlimit - field.value.length;

}

// End -->

</SCRIPT>

</HEAD>

<BODY>

<font size="1" face="arial, helvetica, sans-serif">( You may enter up to 125

characters. )<br>

<textarea name="message" wrap="physical" cols="28" rows="4" onKeyDown="textCounter(this.form.message,this.form.remLen,125);"

onKeyUp="textCounter(this.form.message,this.form.remLen,125);"></textarea>

<br>

<input readonly type="text" name="remLen" size="3" maxlength="3" value="125"> characters

left</font>

</form>

</center>

<font face="arial, helvetica" SIZE="-2">Free JavaScripts provided<br>

by <a href="http://javascriptsource.com">The JavaScript Source</a></font>

</center>

</BODY>