Summary of various usages of select in html (code)

$("selectList").style.display=$("selectList").style.display=="block"?"none":"block";

 document.getElementById("LevelDropList").disabled = "value"; 不可用 document.getElementById("LevelDropList").disabled = "value"; 可用
        

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 < head> < SCRIPT LANGUAGE="JavaScript"> < !-- //oSelect 列表的底部添加了一个新选项 function onload(){ var oOption = document.createElement("OPTION"); oOption.text="Ferrari"; oOption.value="4"; oSelect.add(oOption); }
        

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function fnChange(){ oData.value+=oCars.options[oCars.selectedIndex].text + " "; } //--> < /SCRIPT> < /head> < !--手工添加一个Select--> < !--1 uses the SELECT element to create a drop-down list box-->  < OPTION VALUE="1">Calico < OPTION VALUE="2">Tortie < OPTION VALUE="3" SELECTED>Siamese < /SELECT> 
 < !--2 select 元素创建了多项选择列表框，方法是设置了 SIZE 和 MULTIPLE 标签属性。要获得多项选择列表框的选中选项，则须遍历 options 集合并检查 SELECTED 是否被设为 true。-->   BMW < OPTION VALUE="2">Porsche < OPTION VALUE="3" SELECTED>Mercedes < /SELECT> 
 < !--3 以下演示Option的用法-->  < OPTION VALUE="1">宝马 保时捷 大奔 < /SELECT> 
 < TEXTAREA ID="oData"> < /body> 

function createSelect(){ var mySelect = document.createElement("select"); mySelect.id = "mySelect"; document.body.appendChild(mySelect); }

function addOption(){ //根据id查找对象，var obj=document.getElementById('mySelect'); //添加一个选项obj.add(new Option("文本","值"));}

function removeAll(){ var obj=document.getElementById('mySelect'); obj.options.length=0; }

function removeOne(){ var obj=document.getElementById('mySelect'); //index,要删除选项的序号，这里取当前选中选项的序号 var index=obj.selectedIndex; obj.options.remove(index); }

var obj=document.getElementById('mySelect'); var index=obj.selectedIndex; //序号，取当前选中选项的序号 var val = obj.options[index].value;

var obj=document.getElementById('mySelect'); var index=obj.selectedIndex; //序号，取当前选中选项的序号 var val = obj.options[index].text;

var obj=document.getElementById('mySelect'); var index=obj.selectedIndex; //序号，取当前选中选项的序号 var val = obj.options[index]=new Option("新文本","新值");

function removeSelect(){ var mySelect = document.getElementById("mySelect"); mySelect.parentNode.removeChild(mySelect); }

function removeSelect(){ // 向办件人员下拉列表动态添加员工 for ( var i = 0; i < json.length; i++) { var newOption = new Option(json[i].empname, json[i].empid, i); //向办件人员下拉列表添加员工信息 objDeal.options.add(newOption); //客户业务员的Id不为空 if(empbyDealEmpId!="" || empbyDealEmpId!=0){ //员工id等于下拉列表中的值,则下拉列表被选中 if(empbyDealEmpId==objDeal.options[i].value){ //判断此下拉列表被选中 objDeal.options[i].selected=true;