输入文本框值不会更改

In my .aspx page I have a 'input' html tag, also an asp button.

在我的.aspx页面中,我有一个'input'html标签,也是一个asp按钮。

 <input id="Name" type="text" runat="server" clientidmode="Static" />
 <asp:Button Width="100" type="submit" ID="sendOrder" runat="server" OnClick="SubmitForm" Text="Submit" />

On page load, I am filling the value in input tag from code behind, like this:

在页面加载时,我从后面的代码填充输入标记中的值,如下所示:

  Name.Value= "X";

But now if I change value of this text box from browser, lets say "Y", and click on Submit button, then I get the old value, but not the new one.

但是现在如果我从浏览器更改此文本框的值,让我们说“Y”,然后单击“提交”按钮,然后我得到旧值,但不是新值。

 protected void SubmitForm(object sender, EventArgs e)
    {
    var test= Name.Value; // here I get old value
    }

How can I get the altered value?

我怎样才能获得改变的价值?

4 个解决方案

#1

Make sure you are only setting the value to "X" when its not a postback:

当它不是回发时,请确保您只将值设置为“X”:

if (!Page.IsPostBack){
   Name.Value= "X";
}

Otherwise when clicking the submit button, the Page_Load() event will change the value from "Y" back to "X".

否则,单击提交按钮时,Page_Load()事件会将值从“Y”更改回“X”。

#2

You need to use !IsPostBack on Page_Load shown as below:

你需要在Page_Load上使用!IsPostBack如下所示:

protected void Page_Load(object sender, EventArgs e)
{
    //it's important to use this, otherwise textbox old value overrides again
    if (!IsPostBack)
    {
        Name.Value= "X";
    }
}

Suggestion:

We can use use <input></input> control in asp.net but best practice is to use <asp:TextBox></asp:TextBox> control instead.

我们可以在asp.net中使用控件,但最佳实践是使用控件。

Here is the sample example: HTML

以下是示例示例:HTML

<asp:TextBox ID="Name" runat="server"></asp:TextBox>
<asp:Button Width="100" ID="sendOrder" runat="server" OnClick="SubmitForm"
Text="Submit" />

Code-behind:

protected void Page_Load(object sender, EventArgs e)
{
    //it's important to use this, otherwise textbox old value overrides again
    if (!IsPostBack)
    {
        Name.Text = "Some Value";
    }
}

protected void SubmitForm(object sender, EventArgs e)
{
    var test = Name.Text; //now get new value here..
}

#3

Check for IsPostback in Page_Load so you don't overwrite the values that are submitted!

在Page_Load中检查IsPostback,这样就不会覆盖提交的值!

#4

You don't need all the else portion, just do this

你不需要所有的其他部分,只需这样做

protected void Page_Load(object sender, EventArgs e)
  {
    if (!Page.IsPostBack)
    {
         //code to execute here only when an action is taken by the user
         //and not affected by PostBack
    }

    //these codes should be affected by PostBack
 }

#1