Question

用js如何得到隐藏域的值

我做的是动态广告轮换，取出来可是得不到值
<script language="javascript" type="text/javascript">
var pics = document.getElementById(lblPic).value;
var links="#";
var texts="";
var focus_width=380;
var focus_height=180;
var text_height=0;
var swf_height = focus_height+text_height;

document.write('<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="'+ focus_width +'" height="'+ swf_height +'">');
document.write('<param name="allowScriptAccess" value="sameDomain"><param name="movie" value="swf/autof06n.swf"><param name=wmode value=transparent><param name="quality" value="high">');
document.write('<param name="menu" value="false"><param name=wmode value="opaque">');
document.write('<param name="FlashVars" value="pics='+pics+'&links='+links+'&texts='+texts+'&borderwidth='+focus_width+'&borderheight='+focus_height+'&textheight='+text_height+'">');
document.write('<embed src="swf/autof06n.swf" wmode="opaque" FlashVars="pics='+pics+'&links='+links+'&texts='+texts+'&borderwidth='+focus_width+'&borderheight='+focus_height+'&textheight='+text_height+'" menu="false" bgcolor="#DADADA" quality="high" width="'+ focus_width +'" height="'+ swf_height +'" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />');
document.write('</object>');
</script>
<input type="hidden" name="lblPic" id="lblPic" runat="server" />
后台中已绑定了lblPic，测试时也有值，就是放到js里就出不来效果，什么也没有，麻烦各位帮帮忙

Answer 1

直接通过id来获取

<input type="hidden" id="hideIpt">

//js 这样写
var hideIpt  = document.getElementById('hideIpt');
alert(hideIpt.value)

Answer 2

var pics = document.getElementById(lblPic).value;
这个改成 var pics = document.getElementById("lblPic").value;
id 要引起来的
如果.value拿不到值。你试下.text.还有.innerText

Answer 3

<input type="hidden" name="lblPic" id="lblPic" runat="server" />
你这是ASP。NET？

那玩意很久没玩了。。。 runat="server"这句代表这个隐藏域是服务器控件吧？这样通过getElementById能取到吗？把这个属性去掉试试。。。

Answer 4

var pics = document.getElementById("lblPic").value;

Answer 5

这位仁兄 getElementById("")要加引号的!你连这个input都没获取到怎么获取到值啊 自己alert(document.getElementById(lblPic)) 输出一下就知道了 应该是null吧