更改使用JavaScript的输入值 [英] Changing input value using javascript

问题描述

我一直在寻找一个原因，这并不工作，但我不能找到一个。在我的asp.net应用程序我创建了一堆在C＃中隐藏的输入，然后尝试修改它们在JavaScript之前，我叫他们回服务器。

我的C＃code：

  hidden3 =新HtmlInputHidden（）;
    hidden3.ID =总;
    hidden3.Value = index.ToString（）;
    this.Controls.Add（hidden3）;
 

我的javascript code：

  MOD =的document.getElementById（总）;
     mod.value =的newval;
 

我可以打电话值回罚款，但它不会改变。我还增加了警报的原始值，然后将该值变化值后，他们都表现出了罚款。然而，code是从来没有改变过，所以当我拉值

要获取值回我使用这一点;

  HtmlInputHidden hiddenControl =（HtmlInputHidden）的FindControl（总）;
 

解决方案

动态创建这些控件，它们在每个回发到创建。然而，这些都应该pferably的Page_Load $ P $在Page_Init事件处理程序之前建成。如果这些都在Pag​​e_Load中创建视图状态已被处理和控制，不能从张贴值设置

I've been looking for a reason why this doesn't work, but I can't find one. In my asp.net application I create a a bunch of hidden inputs in c# and then try to modify them in javascript before I call them back to the server.

My c# code:

    hidden3 = new HtmlInputHidden();
    hidden3.ID = "total";
    hidden3.Value = index.ToString();
    this.Controls.Add(hidden3);

my javascript code:

     mod = document.getElementById("total");
     mod.value = newVal;

I can call the value back fine but it doesn't change. I have also added alerts for the original value and then the value after changing values and they both show up fine. However the code is never changed so when I pull the values

To get the value back I am using this;

    HtmlInputHidden hiddenControl = (HtmlInputHidden)FindControl("total");

解决方案

These controls are dynamically created and they have to be created in each postback. However, these should be built before Page_Load preferably in Page_Init event handler. If these are created in Page_Load, the view state has already been processed and the control can't be set from the posted value.

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