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Uncaught TypeError While Attaching Client Side Event to Telerik RadEditor

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6 Oct 2014CPOL
In this blog, we will explore the error I faced, while I was attaching Events to Telerik RadEditor and how I resolved that.

In this blog, we will explore the error I faced, while I was attaching Events to Telerik RadEditor and how I resolved that.

Walkthrough

Declare the Event in Markup

We need to declare RadEditor OnClientLoad Event for the RadEditor.

This event is fired after the content is set in the content area, after the OnClientInit event and just before the editor is ready for use.

<telerik:RadEditor

    runat="server"

   ID="RadEditor1"

   OnClientLoad="OnClientLoad">

Define the Event

We are going to attach onkeydown, onchange and onpaste Events to the RadEditor. So, whenever we type or paste something in the RadEditor, detectChanges() will be fired.

function OnClientLoad(editor)
{
    editor.attachEvent('onkeydown', function(){ detectChanges(); });
    editor.attachEvent('onchange', function(){ detectChanges(); });
    editor.attachEvent('onpaste', function(){ detectChanges(); });
}

function detectChanges()
{
    alert("You are doing something in RadEditor !!!");
}

Let’s Test

Let’s type or paste something in the RadEditor now.

OOPS !!!! Something bad happened. The below is what I see in the Chrome Developer Tool Browser Console.

RadEditor Error

RadEditor Error

What To Do Now?

Now, the error message says “Uncaught TypeError : undefined is not a function OnClientLoad“. That means, the way we are attaching the Events, is wrong.
So, I looked back to where I started and suddenly I saw that we should attach the Event with attachEventHandler instead of attachEvent. Moreover, attachEvent is no longer supported as MSDN indicated.

Therefore, the updated working code will be…

function OnClientLoad(editor)
{
    editor.attachEventHandler('onkeydown', function(){ detectChanges(); });
    editor.attachEventHandler('onchange', function(){ detectChanges(); });
    editor.attachEventHandler('onpaste', function(){ detectChanges(); });
}

function detectChanges()
{
    alert("You are doing something in RadEditor !!!");
}

Final Correct Output

Here is the alert box, which opens when we type something in the RadEditor.

RadEditor onkeydown Event

RadEditor onkeydown Event

End Notes

Hope you liked the blog. Please share among your circle. Stay updated by following the blog with Email ID or WordPress Account (“Follow Blog via Email” Widget is on the right side panel). Go to “About” Page to know more about me and ways to connect with me. You can simply write to me via the “Contact” form. Thanks for reading.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)
Software Developer Mindfire Solutions
India India
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Technical Blog
Posted 6 Oct 2014

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