Example code for JavaScript operations on select elements and options

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Example code for JavaScript operations on select elements and options_javascript skills

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May 16, 2016 pm 03:16 PM

Without further ado, I will post the code directly for you. The specific code is as follows:

<!DOCTYPE html PUBLIC "-//WC//DTD XHTML . Transitional//EN" "http://www.w.org/TR/xhtml/DTD/xhtml-transitional.dtd">
<html xmlns="http://www.w.org//xhtml">
<head>
<title></title>
<!--添加jquery-->
<script src="../Script/jQuery/jquery-...min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
createSelect("select", "addSel");
addOption("addSel", "first", "第一个数据");
addOption("addSel", "secord", "第二个数据");
addOption("addSel", "three", "第三个数据");
addOption("addSel", "four", "第四个数据");
addOption("addSel", "fives", "第五个数据");
removeOneByIndex("addSel", );
removeOneByObj("addSel", "secord");
//添加一个option更改事件 调用自己写的方法
$("#addSel").change(function () {
alert("旧文本："+getOptionText("addSel") + "旧Value：" + getOptionValue("addSel"));
editOptions("addSel", "新文本","新Value"); //注意：不传value值的时候 value值默认为text的值
alert("新文本：" + getOptionText("addSel") + "新Value：" + getOptionValue("addSel"));
})
})
//动态创建带id的元素
function createSelect(element, id) {
var select = document.createElement(element);
select.id = id;
document.body.appendChild(select);
}
//根据select的id 添加选项option
function addOption(selectID,value,text) {
//根据id查找对象， 
var obj = document.getElementById(selectID); 
obj.options.add(new Option(text, value)); //这个兼容IE与firefox 
}
//删除所有选项option
function removeAll(selectID) {
var obj = document.getElementById(selectID);
obj.options.length = ;
}
//根据 index 值删除一个选项option
function removeOneByIndex(selectID,index) {
var obj = document.getElementById(selectID);
//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;//获取选中的选项的index;
obj.options.remove(index);
}
//根据 value或者text值删除一个选项option
function removeOneByObj(selectID, textOrValue) {
var obj = document.getElementById(selectID);
//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;//获取选中的选项的index;
for (var i = ; i < obj.options.length; i++) {
if (obj.options[i].innerHTML == textOrValue || obj.options[i].value == textOrValue) {
obj.options.remove(i);
break;
}
}
} 
//获得一个Option Value；
function getOptionValue(selectID){
var obj = document.getElementById(selectID); 
var index=obj.selectedIndex; //序号，取当前选中选项的序号 
var val = obj.options[index].value;
return val;
} 
//获得一个option Text;
function getOptionText(selectID) {
var obj = document.getElementById(selectID); 
var index=obj.selectedIndex; //序号，取当前选中选项的序号 
var val = obj.options[index].text;
return val;
}
//修改选中的option
function editOptions(selectID,newText,newValue) {
var obj = document.getElementById(selectID); 
var index=obj.selectedIndex; //序号，取当前选中选项的序号 
obj.options[index] = new Option(newText, newValue);
obj.options[index].selected = true;
}
//删除select
function removeSelect(){
var select = document.getElementById("select"); 
select.parentNode.removeChild(select); 
}
</script>
</head>
<body>
</body>
</html>

The above is the example code that the editor shared with you to operate the select element and option in JavaScript. I hope it will be helpful to you.

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