CODEWITHSUNDEEP
c#asp.net.netasp.net-4.0
Jack
Jack

Reputation: 7557

How to write <%%> in server controls?

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.

Upvotes: 0

Views: 91

Answers (5)

शेखर
शेखर

Reputation: 17614

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.

Upvotes: 0

Amit Gaikwad
Amit Gaikwad

Reputation: 11

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?

Upvotes: 1

Kapil Khandelwal
Kapil Khandelwal

Reputation: 16144

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/";

Upvotes: 1

dan radu
dan radu

Reputation: 2782

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();"/>

Upvotes: 0

iurisilvio
iurisilvio

Reputation: 4987

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

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

Upvotes: 1

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