给IE下的option项添加disabled的禁用功能
select只读模式
1.disabled:方便,但在表单提交时无法获得值
2.给出默认值,改变选项时自动变回默认选项
3.使用optgroup元素
参考内容:
1.http://www.cainiao8.com/web/js_blueidea/32_readonly_select.html
2.http://blog.youkuaiyun.com/fableking/archive/2008/01/31/2075881.aspx
window.onload = function() {
if (document.getElementsByTagName){
var s = document.getElementsByTagName("select");
if (s.length > 0){
window.select_current = new Array();
for (var i=0, select; select = s[i]; i++){
select.onfocus = function(){
window.select_current[this.id] = this.selectedIndex;
}
select.onchange = function(){
restore(this);
}
emulate(select);
}
}
}
}
function restore(e){
if (e.options[e.selectedIndex].disabled){
e.selectedIndex = window.select_current[e.id];
}
}
function emulate(e){
for (var i=0, option; option = e.options[i]; i++){
if (option.disabled){
option.style.color = "graytext";
}else{
option.style.color = "menutext";
}
}
}
select只读模式
1.disabled:方便,但在表单提交时无法获得值
<select name="" disabled="disabled">
<option>哎,禁用了啊。</option>
<option>没用的选项。</option>
</select>
2.给出默认值,改变选项时自动变回默认选项
<select name="select" onchange="selectedIndex=0">
<option>abc</option>
<option>def</option>
</select>
3.使用optgroup元素
<select>
<option selected>下面两项只能看看啊</option>
<optgroup label="看看一">
</optgroup>
<optgroup label="看看二,哈哈">
</optgroup>
</select>
参考内容:
1.http://www.cainiao8.com/web/js_blueidea/32_readonly_select.html
2.http://blog.youkuaiyun.com/fableking/archive/2008/01/31/2075881.aspx