<div>
Which browser? &nbsp;Please post the rendered HTML.<br />
<br />
Cd&amp;
</div>


Which browser?  Please post the rendered HTML.

Cd&

<div>
You can simly use an input element<br />
<br />
Here is an example<br />
<br />
<b>&lt;input type=&quot;tel&quot; id=&quot;YourId&quot; runat=&quot;server&quot; /&gt;</b>
</div>


You can simly use an input element

Here is an example

<input type="tel" id="YourId" runat="server" />

<div>
<div class="content wysiwyg-content">
Hi there...<br />
<br />
I have a textbox with HTML5 type=&quot;tel&quot; placed on an updatepanel.<br />
On the panel is also a DropDownlist with an AutoPostback on change. After autopostback, the value in the textbox is gone.... <br />
<br />
The (stripped) code:<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &lt;asp:UpdatePanel runat=&quot;server&quot; ID=&quot;up&quot;&gt;<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;ContentTemplate&gt;<br />
&lt;asp:TextBox runat=&quot;server&quot; type=&quot;tel&quot; ID=&quot;txtTel&quot;&gt;&lt;/asp:TextBox&gt;<wbr /><br />
&lt;asp:DropDownList runat=&quot;server&quot; ID=&quot;ddlCities&quot; OnSelectedIndexChanged=&quot;ch<wbr />eckOptions<wbr />&quot; AutoPostBack=&quot;True&quot; /&gt;<br />
&nbsp; &nbsp; &nbsp; &nbsp; &lt;/ContentTemplate&gt;<br />
&nbsp; &nbsp; &nbsp; &lt;/asp:UpdatePanel&gt;<br />
<br />
If I change type=&quot;tel&quot; to type=&quot;text&quot;, the problem is gone.<br />
<br />
Any ideas? Thanks!
</div>
</div>


Hi there...

I have a textbox with HTML5 type="tel" placed on an updatepanel.
On the panel is also a DropDownlist with an AutoPostback on change. After autopostback, the value in the textbox is gone.... 

The (stripped) code:

        <asp:UpdatePanel runat="server" ID="up">
          <ContentTemplate>
<asp:TextBox runat="server" type="tel" ID="txtTel"></asp:TextBox>
<asp:DropDownList runat="server" ID="ddlCities" OnSelectedIndexChanged="checkOptions" AutoPostBack="True" />
        </ContentTemplate>
      </asp:UpdatePanel>

If I change type="tel" to type="text", the problem is gone.

Any ideas? Thanks!

Textbox type=&quot;tel&quot; empty after autopostback

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications

ASP.NET

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

Textbox type=&quot;tel&quot; empty after autopostback

Textbox type="tel" empty after autopostback