动态生成select选项全接触
[著者]zosatapo
[联系]dertyang@263.net
[文章简单说明]本文提供在不刷新页面的前提下，动态生成select选项的
目前比较主流的三种方案。并且提供简单效率测试，网页制作人员可以
根据自己需要选择。
由于时间问题，我没有能写文章说明一下，但是我提供我写的全部代码。
希望有兴趣的同行研究一下。
代码写的应该是很详细的。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<style type="text/css">
body{font-family:Courier New, Courier}
select{font-size:8pt;font-family:Courier New, Courier}
input{font-size:8pt;font-family:Courier New, Courier}
</style>
<SCRIPT LANGUAGE="JavaScript">
<!--
var opttext= new Array(1000);
var optvalue=new Array(1000);
function change(object){
opt=object.options[object.selectedIndex];
alert(opt.value+" : "+opt.text);
}
for(i=0;i<opttext.length;i++)
{
opttext[i]="zosatapo"+i;
optvalue[i]="name"+i;
}
function option(){
var opt;
var start;
var end;
start=new Date();
selContainer.innerHTML="";
selContainer.innerHTML="<select id='selShow' onchange='change(this);'></select>";
for(i=0;i<opttext.length;i++)
{ opt=new Option();
//or you may code like below:
//opt=document.createElement("OPTION");
opt.text=opttext[i];
opt.value=optvalue[i];
selShow.options.add(opt);
}
end=new Date();
optionTime.innerText="The Operation Took Time:"+(end.getTime()-start.getTime())+" milliseconds";
}
function object()
{
var start;
var end;
var str="<select id='selShow' onchange='change(this);'>";
start=new Date();
selContainer.innerHTML="";
for(i=0;i<opttext.length;i++)
{
str+="<option value='"+optvalue[i]+"'>"+opttext[i]+"</option>";
}
str+="</select>";
selContainer.innerHTML=str;
end=new Date();
objectTime.innerText="The Operation Took Time:"+(end.getTime()-start.getTime())+" milliseconds";
}
function join()
{
var len=opttext.length;
var arr=new Array(len);
var start;
var end;
start=new Date();
selContainer.innerHTML="";
joinTime.innerText="";
for(i=0;i<len;i++)
{
arr[i]="<option value='"+optvalue[i]+"'>"+opttext[i]+"</option>";
}
selContainer.innerHTML="<select id='selShow' onchange='change(this);'>"+arr.join()+"</select>";
end=new Date();
joinTime.innerText="The Operation Took Time:"+(end.getTime()-start.getTime())+" milliseconds";
}
//-->
</SCRIPT>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<p align=center><B><FONT SIZE=4>动态生成SELECT选项演示大全</FONT></B></p>
Method I:<font color=blue> options.add()</font><br>
<Input type="Button" value="New Option" onclick="option();">
<span id="optionTime">test</span><br><BR>
Method I:<font color=blue>object.innerHTML</font><br>
<Input type="Button" value="Object InnerHTML" onclick="object();">
<span id="objectTime">test</span><br><BR>
Method I:<font color=blue>object.innerHTML & Array.join()</font><br>
<Input type="Button" value="Array Join" onclick="join();">
<span id="joinTime"><a href=#>test</a></span><br><BR>
<font color=blue>演示效果预览区域：</font><br><br>
<span id="selContainer">
<select id="selShow"><option >Empty</option></select>
</span>
</BODY>
</HTML>