How to obtain a value of an input (type text) on server side in ASP.NET?

Question

Using the HTML markup

<form id="form" runat="server">
  <input id="donkey" type="text" placeholder="monkey" runat="server" />
</form>

I hoped to get the entered value in code behind by

String s = Request.Form["donkey"];

but it only produces null value. When I investigate the data structure I get something like $ctl00$main$donkey so I know it's there. After a while, I simply switched to

<form id="form" runat="server">
  <asp:TextBox id="donkey" type="text" runat="server"></asp:TextBox>
</form>

but I still wonder how to reference the object from server-side if I for some reason won't switch to ASP-component.

M. Mennan Kara · Accepted Answer · 2012-07-30 11:30:31Z

7

If you want to access to the value using request.form, add name attribute to input tag and remove runat attribute.

<input id="donkey" name="donkey" type="text" />

Otherwise use

<asp:TextBox ID="donkey" type="text" runat="server"></asp:TextBox>

and on cs

string s = donkey.Text;

answered Jul 30, 2012 at 11:30

M. Mennan Kara

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1 Comment

Konrad Viltersten Over a year ago

Thanks. It's actually much smoother to use the direct approach of Yograj and User11 but i'll keep the name-attribute in mind. I prefer to use as few as possible in order not to clutter the code.

user1102001 · Accepted Answer · 2012-07-30 11:26:50Z

4

if you want to get value of input use like this

  String s = donkey.value;

answered Jul 30, 2012 at 11:26

user1102001

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Comments

scunliffe · Accepted Answer · 2012-07-30 11:26:41Z

2

I'm not sure about ASP.net but for a regular form field to submit properly it should have a name attribute. That would be the key that you could then lookup the form value.

answered Jul 30, 2012 at 11:26

scunliffe

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Comments

Hmax · Accepted Answer · 2018-05-24 16:45:18Z

2

Just donkey.Value will return the value from text input which should have runat="server". It will create an object of System.Web.UI.HtmlControls.HtmlInputText.

edited May 24, 2018 at 16:45

Hmax

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answered Jul 30, 2012 at 11:26

Yograj Gupta

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