AJAX ColorPickerExtender in ASP.Net With JavaScript Function

Shaili Dashora
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AJAX ColorPickerExtender

The AJAX ColorPickerExtender provides client-side color-picking functionality with a UI in a popup control. It can be attached to any ASP.NET TextBox control.

Properties of AJAX ColorPickerExtender

targetcontrolid: It is used for the TextBox Control that will display the hexadecimal color value.
samplecontrolid: It is used for the Control that will show the preview of the selected color.
PopupButtonID: It is used for the ID of a control to show the ColorPicker popup when clicked.
PopupPosition: It indicates where the color picker popup appears, like at the BottomLeft (default).
BottomRight, TopLeft, TopRight,Left or Right of the TextBox.
OnClientColorSelectionChanged: The JavaScript function to be called when the color is changed.

Now we will create and use an AJAX ColorPickerExtender in ASP.NET.

Step 1: Open Visual Studio and create a project named AJAXColorPickerExtender.

Step 2: Add one Webform named ColorPicker.

Step 3: Now in design view we will add a ToolkitScriptManager from the ToolBox.

<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>

Step 4: Now we will add a TextBox that contains the Hexadecimal value of the color and a Button to trigger the color picker. We will also add a DIV in which we can view a preview of the colors.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ColorPicker.aspx.cs" Inherits="AJAXColorPickerExtender.ColorPicker" %>
<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
<asp:TextBox ID="tbcolor" runat="server"></asp:TextBox>
<br />
<br />
<div id="view" style="width:60px; height:60px; border:1px solid #000;margin:0 3px;float:left">
</div>
<asp:Button ID="btncolor" runat="server" Text="SelectColor" />
</div>
</form>
</body>
</html>

Now the Design View looks like this.

Step 5: Now we will add the AJAXColorPickerExtender from the AJAX panel from the ToolBox and we will provide some properties for it.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ColorPicker.aspx.cs" Inherits="AJAXColorPickerExtender.ColorPicker" %>
<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
<asp:TextBox ID="tbcolor" runat="server"></asp:TextBox>
<br />
<br />
<div id="view" style="width:60px; height:60px; border:1px solid #000;margin:0 3px;float:left">
</div>
<asp:Button ID="btncolor" runat="server" Text="SelectColor" />
<asp:ColorPickerExtender ID="ColorPickerExtender" runat="server"
TargetControlID="tbcolor"
SampleControlID="view"
PopupButtonID="btncolor"
PopupPosition="Right"
OnClientColorSelectionChanged="Color_Change">
</asp:ColorPickerExtender>
</div>
</form>
</body>
</html>

Step 6: Now On the OnClientColorSelectionChanged event we call the Color_Change JavaScript function.

<script type="text/javascript">
function Color_Change(sender){
sender.get_element().value = "#" + sender.get_selectedColor();
}
</script>

The function adds a Hash (#) as prefix to the color hexadecimal value in the TextBox.

Step 7: Now the complete code will be like this.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ColorPicker.aspx.cs" Inherits="AJAXColorPickerExtender.ColorPicker" %>
<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function Color_Change(sender){
sender.get_element().value = "#" + sender.get_selectedColor();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
<asp:TextBox ID="tbcolor" runat="server"></asp:TextBox>
<br />
<br />
<div id="view" style="width:60px; height:60px; border:1px solid #000;margin:0 3px;float:left">
</div>
<asp:Button ID="btncolor" runat="server" Text="SelectColor" />
<asp:ColorPickerExtender ID="ColorPickerExtender" runat="server"
TargetControlID="tbcolor"
SampleControlID="view"
PopupButtonID="btncolor"
PopupPosition="Right"
OnClientColorSelectionChanged="Color_Change">
</asp:ColorPickerExtender>
</div>
</form>
</body>
</html>