在ASP.NET更新的隐藏字段通过JavaScript [英] Updating a Hidden Field in ASP.NET via JavaScript

问题描述

我继承了一些JavaScript，我被告知要融入我们的ASP.NET站点。我想这将是简单，但它的转向了是一个小小的挑战。

I inherited some JavaScript that I was told to integrate into our ASP.NET site. I thought this would be straightforward but it's turning out to be a bit of a challenge.

在code看起来是这样的：

The code looks something like this:

<SELECT id="Question1" name="Question" onchange="updateQuestion();">                 
<OPTION value="notChosen">--Please Select One--</OPTION>
<OPTION value="in">India</OPTION>
<OPTION value="de">Germany</OPTION>                     
<OPTION value="fr">France</OPTION>                
<OPTION value="us">United States</OPTION>                     
<OPTION value="ch">Switzerland</OPTION>                
</SELECT> 

我们的目标是从这个HTML控件到ASP.NET的价值，然而这控件本身被动态地由JavaScript的另一块产生的，所以我不能只是改变这一个asp.net控制。我的解决办法是添加的onchange =updateQuestion（）;方法，这个JS会拿这些SELECT标签和值放入一个ASP.NET控件：

The goal is to get the value from this HTML control into ASP.NET, however this control itself is being dynamically generated by another chunk of javascript, so I can't just change this to an asp.net control. My solution was to add the onchange="updateQuestion();" method, this JS will take these SELECT tags and place the values into an ASP.NET control:

function updateSecQ() {
    var sQuestion = document.getElementById('<%=sQuestion.ClientID%>');
    sQuestion.Value = "";
    var questions = document.getElementsByName('Question');
    for (question in questions) {
        if (questions[question].value != null)
            sQuestion.Value += questions[question].value + ",";
    }
    alert(sQuestion.Value);
}

如你所见，这就是希望更新ASP.NET控件：
    ＆LT; ASP：HiddenField ID =sQuestion=服务器值=/＆GT;

这似乎所有的工作，但是当我转到形式在服务器端提交我看到sQuestion.Value仍然=

This appears to all work, however when I goto the server side on the form submit I see that sQuestion.Value is still = "".

我不太知道我做错了这里，任何投入将是非常美联社preciated。感谢您的时间。

I'm not quite sure what I've done wrong here, any input would be much appreciated. Thank you for your time.

推荐答案

说不上约ASP.net，但我知道在浏览器的DOM，一个隐藏字段的值是值全部小写，没有价值。它的属性值，浏览器将提交，并通过设置sQuestion.Value，你无法设置其提交的值。

Dunno about ASP.net, but I know in the browser DOM, a hidden field's value is value all lower case, not Value. It's the value attribute that the browser will submit, and by setting sQuestion.Value, you've failed to set its submitted value.

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