Change Background Color of Ajax HtmlEditorExtender using ColorPickerExtender

• Download demo - 1.5 MB

In this blog, we will learn to change the background color of Ajax HtmlEditorExtender using ColorPickerExtender.

Background

There was an question which eventually gave birth to this blog.

Here Comes the Logic

We have already discussed the logic in one of the previous blogs Set Content inside AJAX HTMLEditor and EditorExtender using JavaScript. We just need to find out the Edit Panel, that is the div, which is actually showing data for HtmlEditorExtender. Then, we can easily assign Selected Color of ColorPickerExtender to that div.

<div contenteditable="true"
     id="txtEditorDemo$HtmlEditorExtenderBehavior_ExtenderContentEditable"
     style="height: 80%; overflow: auto; clear: both;"
     class="ajax__html_editor_extender_texteditor">
</div>

Okay! Let’s Get Our Feet Wet

Get the ColorPickerExtender Selected Color

We can easily get the Selected color by handling the OnClientColorSelectionChanged Event of ColorPickerExtender. We can call a JavaScript function on this Event. Let’s see the markup.

<asp:ColorPickerExtender runat="server" 
                         TargetControlID="txtSelectColor"
                         SampleControlID="sampleBodyColor"
                         PopupButtonID="txtSelectColor" 
                         OnClientColorSelectionChanged="colorChanged">
</asp:ColorPickerExtender>

So, the JavaScript function is colorChanged(). The following code would alert you the Selected Color.

function colorChanged(sender) {
    alert(sender.get_selectedColor());
}

Now, Let’s Get the HtmlEditorExtender and Change Its Background Color

There are two ways to do this:

• Using Sys.Application $find Method

  First, find the HTMLEditorExtenderusing ID, then assign the Selected Color to the Background Color Property of its EditableDiv.

  JavaScript

  var htmlEditorExtender = $find("<%= heeEditorDemo.ClientID %>");
  htmlEditorExtender._editableDiv
                    .style
                    .backgroundColor = '#' + sender.get_selectedColor();

• Using jQuery Class Selector

  Get the HTMLEditorExtender by its class name ajax__html_editor_extender_texteditor. Then set its Background Color by .css() Method.

  JavaScript

  var htmlEditorExtender = $('.ajax__html_editor_extender_texteditor');
  htmlEditorExtender.css('background-color', '#' + sender.get_selectedColor());

NOTE

Here, we have appended ‘#’ before the Selected Color. That is because Selected Color is only a Hex Number without the prefix ‘#’, as we can see on the screenshot above, where we have alerted the Selected Color.

Thanks !!!

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