jQuery dynamically adds and deletes select items

// 添加
function col_add() {
	var selObj = $("#mySelect");
	var value="value";
	var text="text";
	selObj.append("<option value=&#39;"+value+"&#39;>"+text+"</option>");
}
// 删除
function col_delete() {
	var selOpt = $("#mySelect option:selected");
	selOpt.remove();
}
// 清空
function col_clear() {
	var selOpt = $("#mySelect option");
	selOpt.remove();
}

The above method isjQuerydynamically add, delete and clear the select. The following is how to write pure js:

var sid = document.getElementById("mySelect");
       
sid.options[sid.options.length]=new Option("text","value");   // 在select最后添加一项

Other commonly used methods:

$("#mySelect").change(function(){//code...});    //select选中项改变时触发

// 获取select值
var text=$("#mySelect").find("option:selected").text();   //获取Select选中项的Text
var value=$("#mySelect").val();   //获取Select选中项的Value
var value=$("#mySelect option:selected").attr("value");   //获取Select选中项的Value
var index=$("#mySelect").get(0).selectedIndex;   //获取Select选中项的索引值，从0开始
var index=$("#mySelect option:selected").attr("index");   //不可用！！！
var index=$("#mySelect option:selected").index();   //获取Select选中项的索引值，从0开始
var maxIndex=$("#mySelect option:last").attr("index");   //不可用！！！
var maxIndex=$("#mySelect option:last").index();//获取Select最大索引值，从0开始
$("#mySelect").prepend("<option value=&#39;value&#39;>text</option>");   //Select第一项前插入一项

// 设置select值
//根据索引设置选中项
$("#mySelect").get(0).selectedIndex=index;//index为索引值 
//根据value设置选中项
$("#mySelect").attr("value","newValue"); 
$("#mySelect").val("newValue"); 
$("#mySelect").get(0).value = value; 
//根据text设置对应的项为选中项
var count=$("#mySelect option").length; 
for(var i=0;i<count;i++) 
{ 
    if($("#mySelect").get(0).options[i].text == text) 
    { 
        $("#mySelect").get(0).options[i].selected = true; 
        break; 
    } 
} 

// 清空select
$("#mySelect").empty();

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