JS動(dòng)態(tài)添加option和刪除option(附實(shí)例代碼)

更新時(shí)間：2013年04月01日 16:25:12 作者：

option的添加和刪除通過(guò)js實(shí)現(xiàn)及動(dòng)態(tài)創(chuàng)建select，本例提供實(shí)例的完整代碼，感興趣的朋友可以參考下哈，希望可以幫助到你

1.動(dòng)態(tài)創(chuàng)建select

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

2.添加選項(xiàng)option

復(fù)制代碼代碼如下:

 
function addOption(){ 
//根據(jù)id查找對(duì)象， 
var obj=document.getElementById('mySelect'); 
//添加一個(gè)選項(xiàng) 
obj.add(new Option("文本","值")); //這個(gè)只能在IE中有效 
obj.options.add(new Option("text","value")); //這個(gè)兼容IE與firefox 
} 

3.刪除所有選項(xiàng)option

復(fù)制代碼代碼如下:

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

4.刪除一個(gè)選項(xiàng)option

復(fù)制代碼代碼如下:

 
function removeOne(){ 
var obj=document.getElementById('mySelect'); 
//index,要?jiǎng)h除選項(xiàng)的序號(hào)，這里取當(dāng)前選中選項(xiàng)的序號(hào) 
var index=obj.selectedIndex; 
obj.options.remove(index); 
} 

5.獲得選項(xiàng)option的值

復(fù)制代碼代碼如下:

 
var obj=document.getElementById('mySelect'); 
var index=obj.selectedIndex; //序號(hào)，取當(dāng)前選中選項(xiàng)的序號(hào) 
var val = obj.options[index].value; 

6.獲得選項(xiàng)option的文本

復(fù)制代碼代碼如下:

 
var obj=document.getElementById('mySelect'); 
var index=obj.selectedIndex; //序號(hào)，取當(dāng)前選中選項(xiàng)的序號(hào) 
var val = obj.options[index].text; 

7.修改選項(xiàng)option

復(fù)制代碼代碼如下:

 
var obj=document.getElementById('mySelect'); 
var index=obj.selectedIndex; //序號(hào)，取當(dāng)前選中選項(xiàng)的序號(hào) 
var val = obj.options[index]=new Option("新文本","新值"); 

8.刪除select

復(fù)制代碼代碼如下:

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

整個(gè)實(shí)例的完整代碼如下：

復(fù)制代碼代碼如下:

 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w3.org/TR/html4/strict.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html"> 
<head> 
<script language=JavaScript> 
function $(id) 
{ 
return document.getElementById(id) 
} 
function show() 
{ 
var selectObj=$("area") 
var myOption=document.createElement("option") 
myOption.setAttribute("value","10") 
myOption.appendChild(document.createTextNode("上海")) 
var myOption1=document.createElement("option") 
myOption1.setAttribute("value","100") 
myOption1.appendChild(document.createTextNode("南京")) 
selectObj.appendChild(myOption) 
selectObj.appendChild(myOption1) 
} 
function choice() 
{ 
var index=$("area").selectedIndex; 
var val=$("area").options[index].getAttribute("value") 
if(val==10) 
{ 
var i=$("context").childNodes.length-1; 
var remobj=$("context").childNodes[i]; 
remobj.removeNode(true) 
var sh=document.createElement("select") 
sh.add(new Option("浦東新區(qū)","101")) 
sh.add(new Option("黃浦區(qū)","102")) 
sh.add(new Option("徐匯區(qū)","103")) 
sh.add(new Option("普陀區(qū)","104")) 
$("context").appendChild(sh) 
} 
if(val==100) 
{ 
var i=$("context").childNodes.length-1; 
var remobj=$("context").childNodes[i]; 
remobj.removeNode(true) 
var nj=document.createElement("select") 
nj.add(new Option("玄武區(qū)","201")) 
nj.add(new Option("白下區(qū)","202")) 
nj.add(new Option("下關(guān)區(qū)","203")) 
nj.add(new Option("棲霞區(qū)","204")) 
$("context").appendChild(nj) 
} 
} 
function calc() 
{ 
var x=$("context").childNodes.length-1; 
alert(x) 
} 
function remove() 
{ 
var i=$("context").childNodes.length-1; 
var remobj=$("context").childNodes[i]; 
remobj.removeNode(true) 
} 
</script> 
<body> 
<div id="context"> 
<select id="area" onchange="choice()"> 
</select> 
</div> 
<input type=button value="顯示" onclick="show()"> 
<input type=button value="計(jì)算結(jié)點(diǎn)" onclick="calc()"> 
<input type=button value="刪除" onclick="remove()"> 
</body> 
</html> 

改進(jìn)版：在select中添加、修改、刪除option元素

復(fù)制代碼代碼如下:

 
function watch_ini(){ // 初始 
for(var i=0; i<arguments.length; i++){ 
var word = document.createElement("OPTION"); 
word.text = arguments[i]; 
watch.keywords.add(word); // watch. is form name 
} 
} 
function watch_add(f){ // 增加 
var word = document.createElement("OPTION"); 
word.text = f.word.value; 
f.keywords.add(word); 
} 

但上述 add() 方法只在IE下有效，為兼容FF和Opera，對(duì)上述代碼進(jìn)行了一下改進(jìn)，改動(dòng)后代碼如下：

復(fù)制代碼代碼如下:

 
function watch_ini(){ // 初始 
for(var i=0; i<arguments.length; i++){ 
var oOption=new Option(arguments[i],arguments[i]); 
document.getElementById("MySelect")[i]=oOption; 
} 
} 
function watch_add(f){ // 增加 
var oOption=new Option(f.word.value,f.word.value); 
f.keywords[f.keywords.length]=oOption; 
} 

整個(gè)實(shí)例的完整代碼如下：

復(fù)制代碼代碼如下:

 
<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> 
<html> 
<head> 
<title>javascript select options text value</title> 
<meta name="keywords" content="javascript select options text value add modify delete set"> 
<meta name="description" content="javascript select options text value add modify delete set"> 
<script language="javascript"> 
<!-- 
function watch_ini(){ // 初始 
for(var i=0; i<arguments.length; i++){ 
var oOption=new Option(arguments[i],arguments[i]); 
document.getElementById("MySelect")[i]=oOption; 
} 
} 
function watch_add(f){ // 增加 
var oOption=new Option(f.word.value,f.word.value); 
f.keywords[f.keywords.length]=oOption; 
} 
function watch_sel(f){ // 編輯 
f.word.value = f.keywords[f.keywords.selectedIndex].text; 
} 
function watch_mod(f){ // 修改 
f.keywords[f.keywords.selectedIndex].text = f.word.value; 
} 
function watch_del(f){ // 刪除 
f.keywords.remove(f.keywords.selectedIndex); 
} 
function watch_set(f){ // 保存 
var set = ""; 
for(var i=0; i<f.keywords.length; i++){ 
set += f.keywords[i].text + ";"; 
} 
confirm(set); 
} 
//--> 
</script> 
</head> 
<body> 
<form name="watch" method="post" action=""> 
<select id="MySelect" name="keywords" size="10" onchange="watch_sel(this.form)"></select><br> 
<script language="javascript"> 
<!-- 
watch_ini("我","你","妳","他","她","它","爾"); // 初始關(guān)鍵詞 
//--> 
</script> 
<input type="text" name="word" /><br /> 
<input type="button" value="增加" onclick="watch_add(this.form);" /> 
<input type="button" value="修改" onclick="watch_mod(this.form);" /> 
<input type="button" value="刪除" onclick="watch_del(this.form);" /> 
<input type="button" value="保存" onclick="watch_set(this.form);" /> 
</form> 

用一個(gè)字符串創(chuàng)建一個(gè)數(shù)組方法:

復(fù)制代碼代碼如下:

 
<script language="javascript"> 
</body> 
</html> 
<script> 
functionspli(){ 
datastr="2,2,3,5,6,6"; 
varstr=newArray(); 
str=datastr.split(","); 
for(i=0;i<str.length ;i++ ) { 
document.write(str[i]+"<br/>"); 
} } spli(); 
</script> 

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