The JavaScript function is functioning correctly when triggered by an onclick event, but it is not

In my code, I have a custom JavaScript function:

function expandField(element) {
    element.style.width = "550px";
}

To apply this function to a RadTextBox control, I initially used the following setup:

<telerik:RadTextBox ID="txtSubject" runat="server" EnableEmbeddedSkins="false"
                                    Skin="Default" Width="255px" onclick="expandField(this)"/>

Although this setup worked as expected, I wanted the resizing effect to trigger onfocus instead of onclick. To achieve this change, I updated the RadTextBox configuration as follows:

<telerik:RadTextBox ID="txtSubject" runat="server" EnableEmbeddedSkins="false"
                                    Skin="Default" Width="255px" onfocus="expandField(this)"/>

However, when switching to the onfocus event, the size adjustment no longer took place on the webpage. Despite the fact that the JavaScript function was being executed (verified through an alert within the function), the textbox did not resize as intended.

Therefore, my question is: why does the function successfully execute with an onclick event but fails to work with an onfocus event?

c#javascriptasp.nettelerik

Answer №1

ASPX

<telerik:RadTextBox ID="txtSubject" runat="server" EnableEmbeddedSkins="false" Skin="Default" Width="255px" >
    <ClientEvents OnFocus="makefieldlonger" />
</telerik:RadTextBox>

Alternatively, the ClientEvents-OnFocus property can be used to assign a function as suggested by @Blade0rz.

JavaScript

<script type="text/javascript">
    function makefieldlonger(sender, eventArgs)
    {
        sender._element.style.width = "550px";
    }
</script>

Reference : RadControls for ASP.NET AJAX Documentation

Answer №2

It appears that the OnFocus function requires two arguments. It is likely that the element parameter in your function is referencing the event arguments.

Consider implementing this code snippet (formatted as a ClientEvent):

<telerik:RadTextBox ID="txtSubject" runat="server" EnableEmbeddedSkins="false" Skin="Default" Width="255px">
    <ClientEvents OnFocus="makefieldlonger" />
</telerik:RadTextBox>

Your corresponding function should look like this:

function makefieldlonger(sender, eventArgs) {
    sender.style.width = "550px";
}

This information is sourced from the Telerik RadTextBox Documentation

Answer №3

Consider implementing the OnBlur() function instead. Changing the size of a textbox on its Focus event could potentially lead to errors. With OnBlur, the event will fire when the control leaves the textbox, allowing for seamless adjustments.

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