i have one page to design. in this it includes an , password text box,
My requirment is that when an user hit the submit button without entering any data, then it shows a message in red color at side of both the text box as "Cannot be empty"
How it can be done without using Javascript?
In this instance you would use a RequiredFieldValidator control, drop that in your page. It will by default use javascript and server side. You can turn the javascript off by setting the EnableClientScript property to false. You'd associate this validator with your text box using the ControlToValidate property. Set the Text property to the message you want to display.
On the server side event generated by your button simply call the Page's IsValid property and only if it is valid continue processing.
See Validating Form Input Controls.
I found this tutorial at http://social.msdn.microsoft.com/Search/en-US/?query=asp.net%20validation&ac=8.
You can use validation controls. They support client side and server side validation.
You don't need to know javascript if you mean that.
In ASP.Net you can have Validators.
http://www.dotnetcurry.com/ShowArticle.aspx?ID=121&AspxAutoDetectCookieSupport=1
Short but true =)
Related
In ASP.NET a RequiredFieldValidator still validates a textbox control even if I disabled it on the client-side. I wanted to get rid of this behavior by using a CustomValidator. In the validation function I check if the text box is enabled. If that is the case I set the validator to valid.
function ValidateTextBox(sender, args) {
var $textbox = $('#txtFoo')
args.isValid = $textbox.prop('disabled') || $textbox.val();
}
This works fine on the client-side. The problem is, that I changed the state of the text box on the client-side using JavaScript. The server therefore does not know about the changed state (that the textbox control is disabled now). So when the ServerValidate event of the custom validator is raised (by calling Page.Validate for example) I cannot check whether the text box is disabled or not. Because the server does not know about this the Enabled property is always set to true, no matter what I do on the client-side.
How can I disable validation for controls when they are disabled or tell the server the state of the text box during Postback?
Thanks for your time.
Instead of making 'disabled' try to set textbox to 'ReadOnly' mode.
You can Enable or Disable your RequiredFieldValidator at the time of you are disabling the textbox using ValidatorEnable JavaScript method
(reference)
I have a RegularExpressionValidator for a TextBox in a control, which itself is part of another control. When I click the button to submit the form, it seems that it should not do so unless all child controls are properly validated. However, what ends up happening is that I see the validation error message pop up for each control that failed to validate before the page posts back anyway and fails when it can't parse the malformed input.
I have tried surrounding the failing code with if (Page.IsValid) {...} to make sure it doesn't run without complete validation, but the property ends up being true by the time I hit the breakpoint.
Shouldn't an entire page be invalid if any child controls are not successfully validated?
Do you have different ValidationGroup controls defined? As long as the validators in the same validation group as the button are all setup correctly, yes it should block. Unless, for some reason, the JS is failing to load for the validators.
HTH.
Set "CausesValidation = true " to your submit button, I guess your problem will be solved.
Have you called Page.Validate() before using Page.IsValid ?
I have an asp:textbox. On textchange of this textbox, I'm doing validation for the text entered. If the text entered is incorrect, I want to flash a message of incorrect text entered. Please re-enter. How can I do this in ASP?
Just use a RegularExpressionValidator and keep client validation property at it's default "true" value. The control will handle this behavior for you.
Here's an example in action with the code: http://www.w3schools.com/ASPNET/showasp.asp?filename=demo_regularexpvalidator
You should avoid using that property if you can. Your validation code will only run when you postback to the server, and you don't want to do a full postback every time the text changes unless you really have to. Instead, use javascript to handle the onchange event of the input element rendered in the raw html by asp.net. Then remember to duplicate your validation code on the server.
I have two asp.net buttons in my page.If i make button cause validation false then am able to
fire button click event on server side but not able to validate text box values(but i need to validate text boxes) using required field validator.
Thank you very much...
If you want your form to be validated, you need CausesValidation to be true.
For the server side event handler to run, the form needs to be valid, according to the validators you have setup.
Can you post the page markup (including validators), so we can see the issue?
I'm designing a website and I want my login page to catch "Enter" with all components, but i can not assign any Key or Mouse Events to TextBox ... After pressing to "Enter" a function should be run with 2 parameters (user name and password).
How can i do this?
If you wrap all the controls inside a standard HTML form then hitting enter in one of the text boxes will submit the form. You can then process the username and password entered on the server as with a normal form submission. Is that the behaviour you're looking for?
You don't need to trap any events on the client in this case so no need for JavaScript.
How to submit ASP.NET forms with the enter key
Read up on the defaultbutton property for forms and panels. This should get you what you want. From the site above:
ASP.NET 2.0 introduces a wonderful work around for this. By simply specifying the "defaultbutton" property to the ID of the , whose event you want to fire, your job is done.
The defaultbutton property can be specified at the Form level in the form tag as well as at panel level in the definition tag. The form level setting is overridden when specified at the panel level, for those controls that are inside the panel.
http://www.beansoftware.com/asp.net-tutorials/accept-enter-key.aspx
finally if found the answer. Here is ! The only problem is, I can not hide my button,
so that i put that button to web page as "Login" ... Defaultbutton could be hidden or not?