我希望有一些功能,如果我写
<textarea maxlength="50"></textarea>
<textarea maxlength="150"></textarea>
<textarea maxlength="250"></textarea>
它会自动将最大长度施加到textArea上。如果可能,请不要在jQuery中提供解决方案。
注意:如果我这样做,可以做到这一点:
<textarea onkeypress="return imposeMaxLength(event, this, 110);" rows="4" cols="50">
function imposeMaxLength(Event, Object, MaxLen)
{
return (Object.value.length <= MaxLen)||(Event.keyCode == 8 ||Event.keyCode==46||(Event.keyCode>=35&&Event.keyCode<=40))
}
从复制
但重点是,我不想每次声明textArea时都编写onKeyPress和onKeyUp。
发布于 2009-07-14 13:48:39
window.onload = function() {
var txts = document.getElementsByTagName('TEXTAREA');
for(var i = 0, l = txts.length; i < l; i++) {
if(/^[0-9]+$/.test(txts[i].getAttribute("maxlength"))) {
var func = function() {
var len = parseInt(this.getAttribute("maxlength"), 10);
if(this.value.length > len) {
alert('Maximum length exceeded: ' + len);
this.value = this.value.substr(0, len);
return false;
}
}
txts[i].onkeyup = func;
txts[i].onblur = func;
}
};
}
发布于 2011-05-09 20:01:30
我知道你想避免jQuery,但是由于解决方案需要JavaScript,所以这个解决方案(使用jQuery 1.4)是最谨慎和健壮的。
灵感来自于Dana Woodman的回答,但这是对Dana Woodman答案的改进:
这个答案的变化是:更简单,更通用,使用jQuery.live,如果长度合适,也不设置val (导致在IE中使用箭头键,在IE中有明显的加速):
// Get all textareas that have a "maxlength" property. Now, and when later adding HTML using jQuery-scripting:
$('textarea[maxlength]').live('keyup blur', function() {
// Store the maxlength and value of the field.
var maxlength = $(this).attr('maxlength');
var val = $(this).val();
// Trim the field if it has content over the maxlength.
if (val.length > maxlength) {
$(this).val(val.slice(0, maxlength));
}
});
编辑:jQuery 1.7+的更新版本,使用on
而不是live
// Get all textareas that have a "maxlength" property. Now, and when later adding HTML using jQuery-scripting:
$('textarea[maxlength]').on('keyup blur', function() {
// Store the maxlength and value of the field.
var maxlength = $(this).attr('maxlength');
var val = $(this).val();
// Trim the field if it has content over the maxlength.
if (val.length > maxlength) {
$(this).val(val.slice(0, maxlength));
}
});
发布于 2011-08-11 02:21:02
HTML5将maxlength
属性添加到textarea
元素,如下所示:
<!DOCTYPE html>
<html>
<body>
<form action="processForm.php" action="post">
<label for="story">Tell me your story:</label><br>
<textarea id="story" maxlength="100"></textarea>
<input type="submit" value="Submit">
</form>
</body>
</html>
目前在Chrome 13、FF 5和Safari 5中支持此功能。毫不奇怪,IE 9不支持此功能。(在Win 7上测试)
https://stackoverflow.com/questions/1125482
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