通过隐藏通过隐藏option实现实现select的联动效果的联动效果
代码如下:
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-
transitional.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml”>
<head>
<title>Untitled Page</title>
<script type=”text/javascript” src=”http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js”></script>
<script type=”text/javascript” language=”javascript”>
$(function(){
//Bind the change event
$(“#dropLang”).unbind(“change”, eDropLangChange).bind(“change”, eDropLangChange);
$(“#dropFrame”).unbind(“change”, eDropFrameChange).bind(“change”, eDropFrameChange);
});
//The change event of language dropdown-list
var eDropLangChange = function(){
//The selected value of the language dropdown-list.
var selectedValue = $(this).val();
//show all options.
$(“#dropFrame”).children(“span”).each(function(){
$(this).children().clone().replaceAll($(this)); //use the content of the <span> replace the <span>
});
//Filter the data through selected value of language dropdown-list except <Please Select>.
//If the option is <Please Select>, it only needs to show all and hide nothing.
if(parseInt(selectedValue) != 0){
//hide the option whose parentid is not equal with selected value of language dropdown-list.
//The <Please Select> option should not be hidden.
$(“#dropFrame”).children(“option[parentid!='” + selectedValue + “‘][value!=’0’]”).each(function(){
$(this).wrap(“<span style=’display:none’></span>”); //add a <span> around the <option> and hide the <span>.
});
}
};
//The change event of frame dropdown-list.
var eDropFrameChange = function(){
//Find the selected option of frame dropdown-list. set the value of language dropdown-list by selected parentid.
$(“#dropLang”).val($(this).children(“option:selected”).attr(“parentid”));
};
</script>
</head>
<body>
<div>
<select id=”dropLang”>
<option selected=”selected” value=”0″><Please Select></option>
<option value=”1″>Javascript</option>
<option value=”2″>Java</option>
<option value=”3″>C#</option>
</select>
<select id=”dropFrame”>
<option selected=”selected” value=”0″><Please Select></option>
<option value=”1″ parentid=”1″>JQuery</option>
<option value=”2″ parentid=”1″>Prototype</option>
<option value=”3″ parentid=”2″>Struts</option>
<option value=”4″ parentid=”2″>Spring</option>
<option value=”5″ parentid=”2″>Velocity</option>
<option value=”6″ parentid=”2″>Hibernate</option>
<option value=”7″ parentid=”3″>ASP.NET MVC</option>
<option value=”8″ parentid=”3″>Castle</option>
</select>
</div>
</body>
</html>
这样，通过上一个下拉框的选择过滤下拉框的内容，基本实现了隐藏<option>的效果，当然，也可以把这种方法利用在下拉框
级联选择的功能上，无需Ajax。
该代码在IE6，IE7，Chrome2，Firefox3。5下验证通过。
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