使用JavaScript来设置隐藏字段的值，然后从服务器端的C＃代码访问值 [英] Using javascript to set value of hidden field then access value from serverside c# code

问题描述

我使用的样式为下拉一个嵌套的HTML无序列表。当内部列表列表项中的一个标签被点击它引发一些JavaScript这应该设置隐藏字段的文本被点击的链接的价值。

JavaScript的似乎工作 - 我用了一个警告，要求其隐藏字段阅读的价值，但后来当我试图把该值在查询字符串在我的asp.net C＃代码背后 - 它拉的初始值 - 不是的JavaScript设定值。

我想这是因为JavaScript是客户端而不是服务器端，但有没有人任何想法如何我能得到这个工作。

HTML

 < DIV CLASS =下拉住宿> 
<标签=accomodationList>住宿和LT类型; /标签> 
< UL类=快速链接ID =accomodationList> 
<李>< A HREF =＃称号=快速链接ID =accomodationSelectList>各类
<！ -  [如果IE 7><！ -  - >&下; / A>&下;！ - &下;！[ENDIF]  -  GT; 
 
<！ -  [如果LTE IE 6><表>< TR>< TD><！[ENDIF]  - > 
< UL ID =亚健康的onclick =dropDownSelected（事件，'住宿'）;> 
<李>< A HREF =＃ID =VAL = -1 $＃$所有类型>所有类型< / A>< /李> 
<李>< A HREF =＃ID =VAL = 1 $＃$别墅>别墅LT; / A>< /李> 
<李>< A HREF =＃ID =VAL = 2 $＃$工作室>工作室< / A>< /李> 
<李>< A HREF =＃ID =VAL = 3 $＃$公寓>公寓< / A>< /李> 
<李><一类=最后的href =＃ID =VAL = 4 $＃$仿古属性>仿古物业LT; / A>< /李> 
 
< / UL> 
<！ -  [如果LTE IE 6>< / TD>< / TR>< /表>< / A><！[ENDIF]  - > 
< /李>< / UL> 
< / DIV> 
 
<输入类型=隐藏ID =accomodationAnswer=服务器/> 
  

的JavaScript

 如果（isChildOf（的document.getElementById（parentList）的document.getElementById（targ.id））==真）
 {
 
文档。的getElementById（parentLi）.innerHTML = TNAME; 
的document.getElementById（hiddenFormFieldName）.value的= targ.id; 
警报（'选择的ID'+ targ.id +'在隐藏字段值为'+的document.getElementById（hiddenFormFieldName）.value的）; 
} 
  

C＃代码

 字符串QSTR =ACCOM =+ getValFromLiId（accomodationAnswer.Value）+&放大器;睡=+ getValFromLiId（sleepsAnswer.Value）+&放大器;夜=+ getValFromLiId（nightsAnswer.Value）+&放大器;区域=+ 
 getValFromLiId（regionAnswer.Value）+&安培;价格=+ Utilities.removeCurrencyFormatting（priceAnswer.Value）; 
  

解决方案

我会做这样的：首先，删除 RUNAT =服务器从隐藏字段属性：

 <输入类型=隐藏ID =accomodationAnswer/> 
  

现在，服务器，要读取值上，这样做：

 字符串accomodationAnswer =的Request.Form [accomodationAnswer]; 
 
 //现在用的，而不是accomodationAnswer.Value 
 //在您指定使用的是
，C＃代码accomodationAnswer  

这应该这样做。

I am using a nested html unordered list styled as a drop down. When the a tag within the inner lists list item is clicked it trigger some javascript which is supposed to set the value of a hidden field to the text for the link that was clicked.

The javascript seems to work - I used an alert to read the value from the hidden field but then when I try to put that value in the querystring in my asp.net c# code behind - it pulls the initial value - not the javascript set value.

I guess this is because the javascript is client side not server side but has anyone any idea how i can get this working

HTML

    <div class="dropDown accomodation">
    <label for="accomodationList">Type of accomodation</label>
    <ul class="quicklinks" id="accomodationList">
        <li><a href="#" title="Quicklinks" id="accomodationSelectList">All types
     <!--[if IE 7]><!--></a><!--<![endif]-->

    <!--[if lte IE 6]><table><tr><td><![endif]-->
    <ul id="sub" onclick="dropDownSelected(event,'accomodation');">
        	<li><a href="#" id="val=-1$#$All types" >All types</a></li>
        	<li><a href="#" id="val=1$#$Villa" >Villa</a></li>
        	<li><a href="#" id="val=2$#$Studio" >Studio</a></li>
        	<li><a href="#" id="val=3$#$Apartment" >Apartment</a></li>
        	<li><a class="last" href="#" id="val=4$#$Rustic Properties" >Rustic Properties</a></li>

    </ul>
    <!--[if lte IE 6]></td></tr></table></a><![endif]-->
        </li></ul>
    </div>

<input type="hidden" ID="accomodationAnswer" runat="server" />

javascript

    if(isChildOf(document.getElementById(parentList),document.getElementById(targ.id)) == true)
{           

            document.getElementById(parentLi).innerHTML = tname;            
            document.getElementById(hiddenFormFieldName).Value = targ.id;
            alert('selected id is ' + targ.id + ' value in hidden field is ' +           document.getElementById(hiddenFormFieldName).Value);
}

C# code

String qstr = "accom=" + getValFromLiId(accomodationAnswer.Value) + "&sleeps=" + getValFromLiId(sleepsAnswer.Value) + "&nights=" + getValFromLiId(nightsAnswer.Value) + "&region=" +
getValFromLiId(regionAnswer.Value) + "&price=" + Utilities.removeCurrencyFormatting(priceAnswer.Value);

解决方案

I would do this: First, remove the runat='server' attribute from the hidden field:

<input type="hidden" ID="accomodationAnswer" />

Now, on the server, where you want to read that value, do this:

string accomodationAnswer = Request.Form["accomodationAnswer"];

// now use accomodationAnswer instead of accomodationAnswer.Value 
// in the C# code that you indicated you are using

That should do it.

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