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Textfield not focusing properly

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John
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John asked on 23 Jul 2012, 05:16 PM
Hi,
I have an application with a text field that needs to be programmatically focused when its view is shown. This in turn brings up the virtual keyboard on mobile devices (as is expected whenever a text field is ever brought into focus).

This feature worked perfectly before the latest Kendo UI upgrade. Once upgraded, android no longer brings the keyboard into view. iOS does not even focus the text field.

I have created a test application to demonstrate the mechanism:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <head>
        <title>Text Field Autofocus</title>
        <link href="kendo.mobile.all.min.css" rel="stylesheet" type="text/css" />
        <script src="jquery-1.7.2.min.js" type="text/javascript"></script>
        <script src="kendo.mobile.min.js" type="text/javascript"></script>
    </head>
    <body>
        <div id="one" data-role="view">
            <div class="km-navbar" data-role="navbar">
                Page 1
            </div>
            <br />
            <span>Click the button to be taken to the 2nd page</span>
            <br />
            <br />
            <a class="km-button" href="#two">Go To Page 2</a>
        </div>
        <div id="two" data-role="view" data-show="focusTextbox"> <!-- function call does not work here -->
            <div class="km-navbar" data-role="navbar">
                <a class="km-button km-back" onclick="javascript:history.go(-1)" data-align="left">Back</a>
                <input id="input" type="search" data-align="left" placeholder="Search Box"/>
            </div>
            <br />
            <span>The text field should be programatically focused on the view's show event.</span><br />
            <br />
            <button onclick="focusTextbox()">Manually Focus</button> <!-- calling from here works -->
        </div>
    </body>
    <script type="text/javascript">
        var app = new kendo.mobile.Application($(document.body));
        function focusTextbox() {
            $("#input").focus();
        }
    </script>
</html>

When calling the same function from a button, it works as expected. It seems that calling the event through the view's show event somehow suppresses default behaviours. 

To further explore this issue, I wrapped the focus() call in a setTimout function. Seeing as the call from the button happens at a much later time then when the view's show event is fired, it may behave differently. 

setTimeout(function () {
    $("#input").focus();
}, 500);

Unfortunately, this is also unable to focus the text field from the view's show event. In fact, doing this also makes the button's call no longer work. After doing some research, I found that Mobile Safari has a feature that limits multi-threading functionality (such as those created by setTimeout) for usability/secuirty reasons. Perhaps there is a threading issue with the view show event.

Hope this helps. Any help with a fix is greatly appreciated. 

Thanks,
John

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Kamen Bundev
Telerik team
answered on 27 Jul 2012, 07:12 AM
Hi John,

With the latest version application wide navigation from a simple link is not possible, contrary to Q1 2012. Make sure that you use Kendo Mobile widgets, for instance buttons with data-role="button" for your navigation for it to work. Open this link in iOS for preview, or check the jsbin below:



Regards,
Kamen Bundev
the Telerik team
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