jQuery对下拉框、单选框、多选框的处理

[ 2009-11-20 22:00:07 | Author: zhenhua ]
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下拉框:
//得到下拉菜单的选中项的文本(注意中间有空格)
var cc1 = $(".formc select[@name='country'] option[@selected]").text();

//得到下拉菜单的选中项的值
var cc2 = $('.formc select[@name="country"]').val();

//得到下拉菜单的选中项的ID属性值
var cc3 = $('.formc select[@name="country"]').attr("id");

//清空下拉框//
$("#select").empty();$("#select").html('');

//添加下拉框的option
$("<option value='1'>1111</option>").appendTo("#select")

select[@name='country'] option[@selected]
表示具有name 属性,并且该属性值为’country’ 的select元素里面的具有selected 属性的option 元素。可以看出有@开头的就表示后面跟的是属性。
单选框:
//得到单选框的选中项的值(注意中间没有空格)
$("input[@type=radio][@checked]").val();

//设置单选框value=2的为选中状态.(注意中间没有空格)
$("input[@type=radio][@value=2]").attr("checked",'checked');
复选框:
//得到复选框的选中的第一项的值
$("input[@type=checkbox][@checked]").val();

//由于复选框一般选中的是多个,所以可以循环输出
$("input[@type=checkbox][@checked]").each(function(){
alert($(this).val());
});

//不打勾
$("#chk1").attr("checked",'');

//打勾
$("#chk2").attr("checked",true);

//判断是否已经打勾
if($("#chk1").attr('checked')==undefined){}

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