How to write <%%> in server controls?

Question

I am trying to use <%=%> in server controls but it isn't working.
This is my code:

 <input type="button" runat="server" value="<< Previous" id="btnPrevious" 
        onclick="location.href='<%=PreviousLink %>'"/>

PreviousLink is property defined in page.
When I view the page the whole expression is written as it without being evaluated.

score 1 · Accepted Answer · answered Feb 19 '13 at 11:18

1

You can't. You can define it in your controller code:

btnPrevious.OnClientClick = "location.href='" + PreviousLink + "'"

answered Feb 19 '13 at 11:18

iurisilvio

4,868
1
30
36

Exactly... you got the idea. – iurisilvio Feb 19 '13 at 11:23

Kapil Khandelwal · Answer 2 · 2013-02-19T11:38:51.870

Try this:

Using jQuery:

<input type="button" runat="server" value="<< Previous" id="btnPrevious"/>
<script>
$(function () {
            $("#<%=btnPrevious.ClientID%>").on("click", function (event) {
                window.location.href = '<%=PreviousLink %>';
            });
});
</script>

Using JavaScript:

function onButtonClick() {
        window.location.href = '<%=PreviousLink %>';
    }

<input type="button" runat="server" value="<< Previous" id="btnPrevious" onclick="onButtonClick();"/>

.aspx.cs (C# code):

public string PreviousLink = "http://stackoverflow.com/";

score 1 · Answer 3 · edited May 23 '17 at 12:04

1

If you remove runat server attribute then <% %> expression will get evaluated properly.
Check this question
Why will <%= %> expressions as property values on a server-controls lead to a compile errors?

edited May 23 '17 at 12:04

Community

1
1

answered Feb 19 '13 at 11:40

Amit Gaikwad

11
1

score 0 · Answer 4 · answered Feb 19 '13 at 11:23

0

That should work too:

<script type="text/javascript">
function setLocation() {
  location.href = '<%=PreviousLink %>';
}
</script>
<input type="button" runat="server" value="<< Previous" id="btnPrevious" onclick="setLocation();"/>

answered Feb 19 '13 at 11:23

dan radu

2,772
4
18
23

score 0 · Answer 5 · answered Feb 19 '13 at 11:54

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.

How to write <%%> in server controls?

5 Answers5