1.动态创建select
复制代码代码如下:
function createSelect(){
var mySelect = document.createElement_x("select");
mySelect.id = "mySelect";
document.body.appendChild(mySelect);
}
2.添加选项option
复制代码代码如下:
function addOption(){
//根据id查找对象，
var obj=document.getElementByIdx_x('mySelect');
//添加一个选项
obj.add(new Option("文本","值")); //这个只能在IE中有效
obj.options.add(new Option("text","value")); //这个兼容IE与firefox
}
3.删除所有选项option
复制代码代码如下:
function removeAll(){
var obj=document.getElementByIdx_x('mySelect');
obj.options.length=0;
}
4.删除一个选项option
复制代码代码如下:
function removeOne(){
var obj=document.getElementByIdx_x('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.获得选项option的值
var obj=document.getElementByIdx_x('mySelect');
var index=obj.selectedIndex; //序号，取当前选中选项的序号
var val = obj.options[index].value;
6.获得选项option的文本
var obj=document.getElementByIdx_x('mySelect');
var index=obj.selectedIndex; //序号，取当前选中选项的序号
var val = obj.options[index].text;
7.修改选项option
var obj=document.getElementByIdx_x('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.删除select
复制代码代码如下:
function removeSelect(){
var mySelect = document.getElementByIdx_x("mySelect");
mySelect.parentNode.removeChild(mySelect);
}
整个实例的完整代码如下：
复制代码代码如下:
< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w***3.org/TR/html4/strict.dtd" >
< html >
< head >
< meta http-equiv="Content-Type" content="text/html" >
< head >
< script language=JavaScript >
function $(id)
{
return document.getElementByIdx_x(id)
}
function show()
{
var selectObj=$("area")
var myOption=document.createElement_x("option")
myOption.setAttribute("value","10")
myOption.appendChild(document.createTextNode("上海"))
var myOption1=document.createElement_x("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_x("select")
sh.add(new Option("浦东新区","101"))
sh.add(new Option("黄浦区","102"))
sh.add(new Option("徐汇区","103"))
sh.add(new Option("普陀区","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_x("select")
nj.add(new Option("玄武区","201"))
nj.add(new Option("白下区","202"))
nj.add(new Option("下关区","203"))
nj.add(new Option("栖霞区","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="显示" onclick="show()" >
< input type=button value="计算结点" onclick="calc()" >
< input type=button value="删除" onclick="remove()" >
< /body >
< /html >
改进版：在select中添加、修改、删除option元素
复制代码代码如下:
function watch_ini(){ // 初始
for(var i=0; i< arguments.length; i++){
var word = document.createElement_x("OPTION");
word.text = arguments[i];
watch.keywords.add(word); // watch. is form name
}
}
function watch_add(f){ // 增加
var word = document.createElement_x("OPTION");
word.text = f.word.value;
f.keywords.add(word);
}
但上述 add() 方法只在IE下有效，为兼容FF和Opera，对上述代码进行了一下改进，改动后代码如下：
复制代码代码如下:
function watch_ini(){ // 初始
for(var i=0; i< arguments.length; i++){
var oOption=new Option(arguments[i],arguments[i]);
document.getElementByIdx_x("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;
}
整个实例的完整代码如下：
复制代码代码如下:
< !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.getElementByIdx_x("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){ // 编辑
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){ // 删除
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","","他","她","它","尔"); // 初始关键词
//-- >
< /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="删除" onclick="watch_del(this.form);" / >
< input type="button" value="保存" onclick="watch_set(this.form);" / >
< /form >
用一个字符串创建一个数组方法:
复制代码代码如下:
< script language="javascript" >
< /body >
< /html >
< script >
function spli(){
datastr="2,2,3,5,6,6";
var str= new Array();
str=datastr.split(",");
for (i=0;i< str.length ;i++ )
{ document.write(str[i]+"< br/ >"); }
}
spli();
< /script >
今天调试了一段js，在ie上运行良好，在火狐上调试出现错误，查资料发现
obj.add(new Option("文本","值")); //这个只能在IE中有效
obj.options.add(new Option("text","value")); //这个兼容IE与firefox
因为这段代码，在网上查资料收藏了这篇文章，实时的温故js