<%String sStr = request.getParameter("s")==null?"":request.getParameter("s") ;
String addValue = request.getParameter("t")==null?"":request.getParameter("t") ;%>
<script>
function window.onload(){
var objs = document.all.s ;
for (var i=0;i<objs.length;i++){
if (objs[i].value=="<%=sStr%>"){
objs[i].selected =true ;
break;
}
}
}
</script>
<BODY BGCOLOR="#FFFFFF">
<form name="f" method="post">
<select name="s">
<option value="aaa1">aaa1</option>
<option value="aaa2">aaa2</option>
<option value="aaa3">aaa3</option>
<option value="aaa4">aaa4</option>
<%if (!addValue.equals(""))
out.println("<option value=\""+addValue+"\">"+addValue+"</option>") ;
%>
</select>
<input type="text" name="t">
<input type="submit" name="sum" value="submit">
</form>
</BODY>你将addValue的值用session中的代替就是了。
有问题再说吧。
String addValue = request.getParameter("t")==null?"":request.getParameter("t") ;%>
<script>
function window.onload(){
var objs = document.all.s ;
for (var i=0;i<objs.length;i++){
if (objs[i].value=="<%=sStr%>"){
objs[i].selected =true ;
break;
}
}
}
</script>
<BODY BGCOLOR="#FFFFFF">
<form name="f" method="post">
<select name="s">
<option value="aaa1">aaa1</option>
<option value="aaa2">aaa2</option>
<option value="aaa3">aaa3</option>
<option value="aaa4">aaa4</option>
<%if (!addValue.equals(""))
out.println("<option value=\""+addValue+"\">"+addValue+"</option>") ;
%>
</select>
<input type="text" name="t">
<input type="submit" name="sum" value="submit">
</form>
</BODY>你将addValue的值用session中的代替就是了。
有问题再说吧。
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function addlistmember()
{
len = document.form1.select.option.length;
obj = new Option("下拉菜单要显示的内容","value");
document.form1.select.option[len] = obj;
}
function window.onload(){
var objs = document.all.s ;
for (var i=0;i<objs.length;i++){
if (objs[i].value=="<%=sStr%>"){
objs[i].selected =true ;
break;
}
}
addlistmember() ;//调用
}
</script>
我加了addlistmember() 之后运行出现对象错误,但是在出现错误之前似乎一闪好象写进去了,但是对象错误这种错误该如何排除啊?
我加了addlistmember() 之后运行出现对象错误,但是在出现错误之前似乎一闪好象写进去了,但是对象错误这种错误该如何排除啊?
能不能告诉我这个函数是那来的,他的作用是什么?
你看是怎么回事呢?
Andrawu你看看我写给你的问题
function window.onload(){
var objs = document.all.s ;
for (var i=0;i<objs.length;i++){
if (objs[i].value==""){
objs[i].selected =true ;
break;
}
}
addlistmember() ;
} function addlistmember()
{
len = document.all.s.length;
document.all.s.add(new Option("text","value"),len) ;
}
</script>
我想做一个类似的东西那该怎么做呢?
String sStr1 = request.getParameter("s1")==null?"":request.getParameter("s1") ;
String sStr2 = request.getParameter("s2")==null?"":request.getParameter("s2") ;
String addValue = request.getParameter("t")==null?"":request.getParameter("t") ;
String[] aStr =new String[3] ;
aStr[0]=sStr0;aStr[1]=sStr1;aStr[2] = sStr2 ;%>
<script>
function window.onload(){
<%for (int i=0;i<aStr.length;i++){%>
var objs = document.all.s<%=i%> ;
for (var i=0;i<objs.length;i++){
if (objs[i].value=="<%=aStr[i]%>"){
objs[i].selected =true ;
break;
}
}
addlistmember(<%=i%>) ;
<%}%>
} function addlistmember(j)
{
var objs = eval("document.all.s"+j) ;
len = objs.length;
objs.add(new Option("text","value"),len) ;
} </script>
<BODY BGCOLOR="#FFFFFF">
<form name="f" method="post">
<select name="s0">
<option value="aaa1">aaa1</option>
<option value="aaa2">aaa2</option>
<option value="aaa3">aaa3</option>
<option value="aaa4">aaa4</option>
</select>
<select name="s1">
<option value="aaa11">aaa11</option>
<option value="aaa21">aaa21</option></select>
<select name="s2">
<option value="aaa12">aaa12</option>
<option value="aaa22">aaa22</option>
<option value="aaa32">aaa32</option>
</select><input type="text" name="t">
<input type="submit" name="sum" value="submit">
</form>
我在最初打开1.jsp是因为session里没有值,所以发生null,point等错误,我后来先给了出值,进去之后就没有问题了,但发现运行后那些下拉菜单了多了几项text,我想是不是函数:addlistmember()的问题
下面:
len = document.all.num.length;
document.all.num.add(new Option("text","value"),len) ;
是什么意思,能给解释一下吗?
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY>
<form name="form1" method="post" action="">
<select name="select" size="1">
<option value="1" selected>1</option>
</select>
<INPUT type="button" name="submit" onclick="addlistmember()">
</form>
</BODY>
<script language="javascript">
function addlistmember()
{
len = document.form1.select.options.length;
obj = new Option("aaa","aaaa");
document.form1.select.options[len] = obj;
}
</script></HTML>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY>
<form name="form1" method="post" action="">
<select name="select" size="1">
<option value="1" selected>1</option>
</select>
<INPUT type="button" name="submit" onclick="addlistmember()">
</form>
</BODY>
<script language="javascript">
function addlistmember()
{
len = document.form1.select.options.length;
obj = new Option("aaa","aaaa");
document.form1.select.options[len] = obj;
}
</script></HTML>