select 或text的onchange事件需要手動（通過鍵盤輸入）改變select或text的值才能觸發，本文為大家介紹下使用js觸發select onchange事件
select 或text的onchange事件需要手動（通過鍵盤輸入）改變select或text的值才能觸發，如果在js中給select或text賦值，則無法觸發onchang事件， 例如，在頁面加載完成以後，需要觸發一個onChange事件，在js中用document.getElementById("province").value="湖北";直接給select或text賦值是不行的，要想實現手動觸發onchange事件，需要在js給select賦值後，加入下面的語句 document.getElementById("province").fireEvent('onchange') 來實現, 代碼如下: <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>無標題文檔</title> <script type="text/javascript"> var provinces = new Array(); provinces["湖北"] = ["武漢","襄陽","隨州","宜昌","十堰"]; provinces["四川"] = ["成都","內江","達州"]; provinces["河南"] =["鄭州","南陽","信陽","漯河"]; function changeProvince() { var prov = document.getElementById("province").value; var city =document.getElementById("city"); city.options.length =0; for(var i in provinces[prov]) { city.options.add(new Option(provinces[prov][i],provinces[prov][i])); } } window.onload = function(){ var province = document.getElementById("province"); for(var index in provinces) { //alert(index); province.options.add(new Option(index,index)); } province.fireEvent("onchange"); }; </script> </head> <body> 省份:<select id="province" onchange= "changeProvince()"></select> 城市:<select id="city"></select> </body> </html>