Need some help with Form Validation

[linuxjr]

Hello Everyone,
I need some assistance with my form validation. I have been given a project by my boss and not given a lot of time to finish it. The project I have been given is to have a form where the user can select a date range and some other filters to be passed to a crystal report popup.

I have the crystal report popup working with the values passed from the form if the user does everything correctly. Anyways I need help with date validation and formatting the date as the user finishes typing the date. I wanted to know if I have to do this in Javascript or are there some C# functionality that will assist me with checking to make sure the end date is not greater than the start date. Also to be able to check after a user types in a date that it is in the correct format?

Any tips or hints will be greatly appreciated. I tried searching this site but at the moment the feature is down so I do apologize if this has been asked a bunch of times.

Have a great day.

 

[tgreer]

You can do this either in JavaScript (which is my recommendation), or C#.

JavaScript:

http://www.codetoad.com/forum/17_10053.asp

(among many others, from a Google Search on "JavaScript Date Validation".

For C#, I would build something using the DateTime class.



Thomas D. Greer

http://www.tgreer.com

Providing PostScript & PDF
Training, Development & Consulting

 

[linuxjr]

Mr. Greer,

I thank you for your quick response. I would prefer using Javascript myself. I went to the link you posted and got the isDate function added to my html code in webform1.aspx. I then try to add to the OnTextChanged method to the textbox control in the html portion as follows:

<asp:textbox id="txtStartDate" OnTextChanged="isDate(txtStartDate.Text);" runat="server"></asp:textbox>

I get an error CS1026: ) expected. Am I missing something like do I need to add the TextChanged Event to my code behind in my webform1.aspx.cs file??

Any tips or suggestions be greatly appreciated. Have a nice day.

 

[tgreer]

The proper JavaScript event handler for the "change" event is:

onchange()

The proper way to pass a control's value to a JavaScript function is to use the "this" keyword:

isDate(this.value)

If you are doing client-side validation, this doesn't really need to be a server control.

Since it is a server control, your Page_Load event needs to add the event handler attribute and function call, like so:

txtStartDate.Attributes.Add("onchange","isDate(this.value)");

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Thomas D. Greer

http://www.tgreer.com

Providing PostScript & PDF
Training, Development & Consulting

 

[linuxjr]

Mr. Greer,
Thank you so much for taking time out of your busy schedule to answer my questions. It finally works properly. I will visit you site when I get off work and check out some of the ads to assist you. Have a great day.