一个简单的实现下拉框多选的插件可移植性比较好_jquery

(function(){

$.fn.extend({
checks_select: function(options){
jq_checks_select = null;
$(this).val("---请选择---");
$(this).next().empty(); //先清空
$(this).unbind("click");
$(this).click(function(e){
jq_check = $(this);
//jq_check.attr("class", "");
if (jq_checks_select == null) {
jq_checks_select = jq_check.next();
jq_checks_select.addClass("checks_div_select");
//jq_checks_select = $("").insertAfter(jq_check);
$.each(options, function(i, n){
check_div=$("").appendTo(jq_checks_select);
check_box=check_div.children();
check_box.click(function(e){
//jq_check.attr("value",$(this).attr("value") );

temp="";
$(this).parents().find("input:checked").each(function(i){
if(i==0){
temp=$(this).val();
}else{
temp+=","+$(this).val();
}
});
//alert(temp);
jq_check.val(temp);
e.stopPropagation();
});
});
jq_checks_select.show();
}else{
jq_checks_select.toggle();

}
e.stopPropagation();
});
$(document).click(function () {
flag=$("#test_div");
if(flag.val()==""){
flag.val("---请选择---");
}
jq_checks_select.hide();
});
//$(this).blur(function(){
//jq_checks_select.css("visibility","hidden");
//alert();
//});
}
})

})(jQuery);