Setting value in html control in code behind without making server control

Question

 <input type="text" name="txt" />
    <!--Please note I don't want put 'runat="server"' here to get the control in code behind-->
    <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />

Code behind:

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        //If I want to initlize some value in input, how can I set here
    }
}
protected void Button1_Click(object sender, EventArgs e)
{
    Request["txt"] // Here I am getting the value of input
}

score 26 · Answer 1 · answered Feb 24 '10 at 11:46

This answer comes from memory, so I apologize if it's slightly off.

What you can do is use an ASP.NET inline expression to set the value during the loading of the page.

First, add a property in the code-behind of your page.

protected string InputValue { get; set; }

In the Page_Load event, set the value of the property.

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        this.InputValue = "something";
    }
}

Finally, add an inline expression in your page markup like this:

<input type="text" name="txt" value="<%= this.InputValue %>" />

This will let you set the value of the input element without making it a server-side tag.

Arne Sostack · Accepted Answer · 2010-02-24T12:53:21.187

11

Elements that are not set runat="server" are considered plain text and collected into as few Literal objects as possible (one between each serverside control). I suppose if you really really wanted to, you could try to find the correct Literal (or maybe LiteralControl) object in Page.Controls, and modify it, but I'd definately recommend against it.

What's so terrible about setting it runat="server" ?

And yes, of course you can also use <%= %>. Embedded code blocks. They're evaluated at Render time, so it should be relatively safe to do so.

edited Feb 24 '10 at 12:53

answered Feb 24 '10 at 11:42

Arne Sostack

258
2
7

3

runat="server" seems to also change the name to e.g. "ctl00$Main$Something" which actually breaks the whole post for a form that should go elsewhere (for example PayPal). – Johncl Sep 17 '12 at 13:55
@Johncl You can have runat server and have the ID remain the same by using `ClientIdMode=`, for example `` The id on the page will be ExactId with no modifications. – Kyle Mar 29 '18 at 23:46

score 3 · Answer 3 · edited Feb 26 '16 at 14:07

3

Add an expression in your page like this:

<input class="field" id="locality" name="loc" value="<%= this.inputtypeCT %>"/>

Add a property in the code-behind of your page:

protected string inputtypeCT;

In the Page_Load event, set the value of the property:

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
         this.inputtypeCT = "test"
    }
}

edited Feb 26 '16 at 14:07

ElGavilan

6,610
16
27
36

answered Feb 26 '16 at 12:33

komal patil

29
1

score 1 · Answer 4 · answered Nov 05 '14 at 08:17

1

<input type="text" name="txt" value="<%= System.Web.HttpUtility.HtmlEncode(this.InputValue) %>" />

answered Nov 05 '14 at 08:17

Chobits

275
2
14
32

score 0 · Answer 5 · answered Feb 21 '18 at 10:38

Add runat server

or use Asp controls like below

 <asp:TextBox type="text" runat="server" class="demoHeaders" id="datepicker" ClientIDMode="Static" Text=""/>

Also make sure that you used ClientIDMode="Static" for the naming of control to be in clinet as like server.

Enjoy!

Setting value in html control in code behind without making server control

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