This article introduces to you a summary (code) of various usages of select in HTML. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
1) Hide and show select:
$("selectList").style.display=$("selectList").style.display=="block"?"none":"block";
2) Select is available or unavailable:
<select disabled="value"> document.getElementById("LevelDropList").disabled = "value"; 不可用 document.getElementById("LevelDropList").disabled = "value"; 可用
<html> < 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); }
function fnChange(){ oData.value+=oCars.options[oCars.selectedIndex].text + " "; } //--> < /SCRIPT> < /head> <body onload="onload()">< !--手工添加一个Select--> < !--1 uses the SELECT element to create a drop-down list box--> <SELECT NAME="Cats" SIZE="1"> < OPTION VALUE="1">Calico < OPTION VALUE="2">Tortie < OPTION VALUE="3" SELECTED>Siamese < /SELECT> <P> < !--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。--> <SELECT ID="oSelect" NAME="Cars" SIZE="3" MULTIPLE> <!--此处设置了3和multiple--> <OPTION VALUE="1" SELECTED>BMW < OPTION VALUE="2">Porsche < OPTION VALUE="3" SELECTED>Mercedes < /SELECT> <P> < !--3 以下演示Option的用法--> <SELECT ID="oCars" SIZE="1" onchange="fnChange()"> < OPTION VALUE="1">宝马 <OPTION VALUE="2">保时捷 <OPTION VALUE="3" SELECTED>大奔 < /SELECT> <P> < TEXTAREA ID="oData"></TEXTAREA> < /body> </html>
Attachment: Some Select skills
1. Dynamic Create select
function createSelect(){ var mySelect = document.createElement("select"); mySelect.id = "mySelect"; document.body.appendChild(mySelect); }
2. Add option option
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"));}
3. Delete all options option
function removeAll(){ var obj=document.getElementById('mySelect'); obj.options.length=0; }
4. Delete one option option
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); }
5. Get The value of option option
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;
6. Get the text of option option
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;
7. Modify option option
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");
8. Delete select
function removeSelect(){ var mySelect = document.getElementById("mySelect"); mySelect.parentNode.removeChild(mySelect); }
9. Set select optin
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;
Recommended related articles:
How the HTML Select object operates the Option object
Introduction to three methods of distributing status across components in React
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