通过隐藏option实现select的联动效果

复制代码代码如下: <!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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