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博客园 - liufei

阿里云服务器访问不了外网 MySQL修改root密码的多种方法 为需要远程登录的用户赋予权限: C#生成电子印章源码 ASP.NET的优点 Android上传 apk格式文件下载 Could not load file or assembly 'System.Core, Version=2.0.5.0 和autofac冲突的问题 1130 - Host '' is not allowerd to connect to this MySQL server, HTTP 错误 500.21 - Internal Server Error 解决方案 . 修改SQL Service数据库排序规则 MSSQL获取昨天,本周,本月。。。 MySQL Packets larger than max_allowed_packet are not allowed asp.net Mvc Npoi 导出导入 excel 骗子手机 15311888578 北京高德豪门网络科技有限公司 面试题 JetBrains ReSharper 8.2 Build 8.2.0.2160 && StyleCop win7开启特定端口 asp.net发布到IIS中出现错误:处理程序“PageHandlerFactory-Integrated”在其模块列表中有一个错误模块“ManagedPipelineHandler” System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e, Retargetable=Yes”
jquery关于select框的取值和赋值
liufei · 2014-08-19 · via 博客园 - liufei

jQuery("#select_id").change(function(){}); // 1.为Select添加事件,当选择其中一项时触发     

var checkValue = jQuery("#select_id").val(); // 2.获取Select选中项的Value  

var checkText = jQuery("#select_id :selected").text(); // 3.获取Select选中项的Text   

var checkIndex = jQuery("#select_id").attr("selectedIndex");// 4.获取Select选中项的索引值,

或者:jQuery("#select_id").get(0).selectedIndex;  

var maxIndex = jQuery("#select_id :last").attr("index");  // 5.获取Select最大的索引值,

或者:jQuery("#select_id :last").get(0).index;

jQuery("#select_id").get(0).selectedIndex = 1; // 1.设置Select索引值为1的项选中  

jQuery("#select_id").val(4);  // 2.设置Select的Value值为4的项选中

$("#select_id").attr("value","Normal“);

$("#select_id").get(0).value = value;

//根据select的显示值来为select设值

var count=$("#select_id").get(0).options.length;

for(var i=0;i<count;i++){

if($("#select_id").get(0).options[i].text == text)  

{

$("#select_id").get(0).options[i].selected = true;          

break;  

}  

}

jQuery("#select_id").append("<option value='新增'>新增option</option>"); // 1.为Select追加一个Option(下拉项)   

jQuery("#select_id").prepend("<option value='请选择'>请选择</option>"); // 2.为Select插入一个Option(第一个位置)  

jQuery("#select_id").get(0).remove(1);  // 3.删除Select中索引值为1的Option(第二个)  

jQuery("#select_id :last").remove();  // 4.删除Select中索引值最大Option(最后一个)   

jQuery("#select_id [value='3']").remove(); // 5.删除Select中Value='3'的Option   

jQuery("#select_id").empty();   // 6.清空下拉列表