tom*_*ted 25 html javascript forms jquery
我正在使用我正在制作的形式中的select标签允许多个选择,但我想将最大选择量提高到10.这可能使用javascript或jquery吗？
提前致谢!
Top*_*gio 29
这里有一些完整的代码供您使用...得热爱Google AJAX API游乐场:-)
编辑1:注意:这只能让你选择5因为我不想复制/粘贴另外10个选项:-)
<!--
copyright (c) 2009 Google inc.
You are free to copy and use this sample.
License can be found here: http://code.google.com/apis/ajaxsearch/faq/#license
-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>Sample Select Maximum with jQuery</title>
<script src="http://www.google.com/jsapi?key=ABQIAAAA1XbMiDxx_BTCY2_FkPh06RRaGTYH6UMl8mADNa0YKuWNNa8VNxQEerTAUcfkyrr6OwBovxn7TDAH5Q"> </script>
<script type="text/javascript">
google.load("jquery", "1");
$(document).ready(function() {
var last_valid_selection = null;
$('#testbox').change(function(event) {
if ($(this).val().length > 5) {
alert('You can only choose 5!');
$(this).val(last_valid_selection);
} else {
last_valid_selection = $(this).val();
}
});
});
</script>
</head>
<body style="font-family: Arial;border: 0 none;">
<select multiple id='testbox'>
<option value='1'>First Option</option>
<option value='2'>Second Option</option>
<option value='3'>Third Option</option>
<option value='4'>Fourth Option</option>
<option value='5'>Fifth Option</option>
<option value='6'>Sixth Option</option>
<option value='7'>Seventh Option</option>
<option value='8'>Eighth Option</option>
<option value='9'>Ninth Option</option>
<option value='10'>Tenth Option</option>
</select>
</body>
</html>
Sam*_*son 16
这会将用户限制为3个选项:
$("select").on("click", "option", function () {
if ( 3 <= $(this).siblings(":selected").length ) {
$(this).removeAttr("selected");
}
});??????????
小提琴:http://jsfiddle.net/2GrYk/
这个答案适用于这些情况:
码:
$('#mySelect').on('change', function() {
if (this.selectedOptions.length < 4) {
$(this).find(':selected').addClass('selected');
$(this).find(':not(:selected)').removeClass('selected');
}else
$(this)
.find(':selected:not(.selected)')
.prop('selected', false);
});
或者,对于不支持的旧浏览器selectedOptions,
$('#mySelect').on('change', function() {
var $sel = $(this).find(':selected');
if ($sel.length < 4) {
$sel.addClass('selected');
$(this).find(':not(:selected)').removeClass('selected');
}else
$(this)
.find(':selected:not(.selected)')
.prop('selected', false);
});