If statements in onclick and onselect not working in ASP.NET
Question
This should be pretty straight forward, but I've been researching for over a day now and can't figure out why this isn't working. I'm making a web page in ASP.NET. What I'm trying to do is have a textbox with gray placeholder text that disappears and changes the font color to black when the textbox is clicked or selected. Here's my code:
<asp:TextBox ID="addEditTextBox1" runat="server" onselect="if(style.color=='#999999'){style.color='Black'; this.value='';}" onclick="if(style.color=='#999999'){style.color='Black';this.value='';}" ForeColor="#999999" Width="250px">Revision #</asp:TextBox>
I've tried changing the "if" statement triggers to
if(style.color.value=='#999999'){...}
and
if(ForeColor=='#999999'){...}
and
if(ForeColor.value=='#999999'){...}
and many other syntaxes but I can't find one that works. I do know the onclick and onselect statements are working because if I replace the "==" with a "=" they trip 100% of the time, but that completely negates the whole idea of an "if" statement. I'm new to ASP.NET and JavaScript, so maybe there's something obvious I'm missing, but I can't find it anywhere. Here's some other information that I didn't think was relevant but may be helpful:
- Running in Visual Studio Professional 2012
This is towards the top of the page's source code:
<html xmlns="http://www.w3.org/1999/xhtml">Target Framework: .NET Framework 4.5.
Feel free to inquire if I left anything out. Thanks!
1 answers
solution1
0 ACCPTED 2015-03-10 16:10:31
Either just simply use a HTML5 placeholder attribute, all the browsers support it now.
Or use this, works for both keyboard tabbing and mouse clicking:
<asp:TextBox ID="addEditTextBox1" runat="server" onfocus="this.onfocus = null; this.value = ''; this.style.color = 'black';" ForeColor="#999999" Width="250px">Revision #</asp:TextBox>
Btw, onclick is really just for buttons, you probably meant onmousedown and onkeydown - onselect is for when selecting text (to prevent it for example).
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