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在項目開發過程中我們時常會碰到要設定下拉框為唯讀（readonly），但是可惜的是select沒有唯讀屬性，所以需要在select外麵包含一個span，通過js來改變。
下面這段html代碼是在struts2的下拉標籤中加入了span標籤，在頁面裝載的時候就讓下拉框變成不可讀。
複製代碼 代碼如下:
<body onload="init()">
<span id="id_select">
<s:select name="sjdwmc" list="sjdxdwList" listKey="dxbh" listValue="dwmc" headerKey="" headerValue=""></s:select>
</span>
</body>
如下是js代碼，在init方法中調用selectReadOnly讓下拉框變成唯讀。
複製代碼 代碼如下:
/*根據頁面上span的id設定select為唯讀/
function selectReadOnly(selectedId){
var obj = document.getElementById(selectedId);
obj.onmouseover = function(){
obj.setCapture();
}
obj.onmouseout = function(){
obj.releaseCapture();
}
obj.onfocus = function(){
obj.blur();
}
obj.onbeforeactivate = function(){
return false;
}
}
function init(){
selectReadOnly("id_select");
}
做到這裡大功告成，試試效果吧！！！
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