Getting Textbox Watermark Text in client side javascript

Can somebody tell me how I can go about grabbing the Text value of a TextBoxWatermark control from client side javascript?  I need to make a comparison/validation if a text box has been filled out (non-blank) and of course the watermark fills in the text value of the text box when grabbing the property (of the text box) per javascript?

So, I need to somehow grab the text from the watermark in javascript and then compare to the text box contents to see if the text in the textbox is the water mark text or not.

 Any information would be greatly appreciated.


3/28/2007 7:11:08 PM 9760 articles. 0 followers. Follow

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 This example is a modified version of the the Toolkit's TextBoxWatermark.aspx.  The key is assigning a BehaviorID to the TextBoxWatermarkExtender and then you can locate it using $find.

<asp:Content ContentPlaceHolderID="SampleContent" Runat="Server">
        function compareText()
            var tb = $get("<%=TextBox1.ClientID %>");
            var behavior = $find("Extender1");
            if(tb.value == behavior._watermarkText)
                alert("Value has not changed!");
                alert("Value has changed!");
    <asp:ScriptManager EnablePartialRendering="true" runat="Server" />
    <div class="demoarea">
        <div class="demoheading">TextBoxWatermark Demonstration</div>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                First name:
                <button onclick="compareText()" value="aaa">aaa</button>
                <asp:TextBox ID="TextBox1" CssClass="unwatermarked" Width="150" runat="server" /><br />
                <ajaxToolkit:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender1" runat="server"
                    WatermarkText="Type First Name Here"
                    WatermarkCssClass="watermarked" BehaviorID="Extender1" />
                Last name:
                <asp:TextBox ID="TextBox2" CssClass="unwatermarked" Width="150" runat="server" /><br /><br />
                <ajaxToolkit:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender2" runat="server"
                    WatermarkText="Type Last Name Here"
                    WatermarkCssClass="watermarked" />
                <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" />
                <br /><br />
                <asp:Label ID="Label1" runat="server" />
    <div class="demobottom"></div>

Please remember to "mark as answered" posts that have helped you.

3/28/2007 7:33:11 PM
Beautiful!  Thanks for replying!  I will give it a try!
3/28/2007 8:41:07 PM

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