I am trying out with knockout validation.
I understand that i am able to use observable for inputs, i.e
<asp:TextBox ID="TxtName" runat="server" data-bind="value:Name"></asp:TextBox>
var self = this;
self.Name = ko.observable().extend({ required: { message: "Please enter your name." } });
but what if i am going to do a validation for a telerik radcaptcha
<telerik:RadCaptcha ID="RadCaptcha" runat="server"></telerik:RadCaptcha>
Am i able to do an observable to check if the radcaptcha is valid and display a message if its not?
For security reasons it is not possible to perform a client-side check on the Telerik RadCaptcha control. Think about it, if client side validation was enabled it would be possible to create a program to bombard the input with responses until the correct one was found.
See Telerik Forum Posts:
http://www.telerik.com/community/forums/aspnet-ajax/captcha/rad-captcha-client-side-validation.aspx
http://www.telerik.com/community/forums/aspnet-ajax/captcha/client-side-support-needed-for-radcaptcha.aspx
Related
i have a form where i need to see if an email address entered into the form is already in a database. this check needs to be performed conditionally based on the value of another field in the form.
here is the form field:
<input type="email" value="" class="form-control" name="email_bill" id="email" required data-parsley-type="email" data-parsley-registered="1" data-parsley-trigger="focusout submit">
and here's the validator code:
Parsley.addValidator('registered', {
validateString: function(value) {
if ($('input[name="d_type"]:checked').val() == 'S') {
return $.ajax({
type: "POST",
url: "/is_registered.html",
data: $('form').serialize()
});
} else {
var parent = $('#email').closest('div');
var this_id = $('#email').attr('data-parsley-id');
$(parent).removeClass('has-error').addClass('parsley-success');
$(this_id).remove();
return true;
}
},
messages: {en: "Someone has already registered with the Email address you entered"}
});
the server code is trivial and returns a '200 OK' header if the address isn't in the database and a '404 Not Found' if it is. that works.
i followed the example in the parsley.js custom validator example for the simple ajax request.
what happens is: if i enter a 'registered' address, i get the appropriate error message. if i then go and modify that address to one i know is NOT registered and tab or mouse out to the next field, the error message goes away, BUT the submit button doesn't work. to further complicate the situation, if i load and fill out a form with a 'non-registered' address, the submit button doesn't work either. it appears that execution of the custom validator disables submit upon entry.
i've played with this for hours, trying all sorts of event manipulation, but nothing works.
i should point out that if the checked value of d_type (see field definition above) is NOT 'S', then everything works as expected.
i am totally baffled as to why following the documentation results in failure.
as it turns out, this was not a problem with parsley at all.
a colleague created the form and the submit button had an id of "submit' which could not allow parsley to resolve the submit handler. under those circumstances, apparently parsley blocks the submit.
who knew?
well now, we know.....
I tried to create a custom data annotation validation attribute (NameValidationAttribute) in MVC 5 project using VS2013. I was able to successfully add the client side validation and the error message for custom validation is getting displayed as soon as the focus leaves the textbox. However, the standard attributes like [Required] and [Range] validators are now not showing proper error messages, says 'Warning: No message defined for 'field' ' (See below screenshot).
Question:
- Why the standard validation error messages are showing as "Warning: No message defined for UnitsInStock"? What am I missing?
Below is my custom client validation script:
I included following scripts in EditProducts page.
Please note that the error messages for UnitPrice, UnitsInStock and ReorderLevel fields are defined with Range validation attribute (see below).
FYI, I tried to change the order of the scripts in ProductEdit page but still its showing the same message.
Please advise!
I ran into this issue. I had created an MVC attribute called PasswordAttribute, with a client side validator called 'password'.
$.validator.addMethod('password', function (value, element, params) {
...[validation logic]
});
$.validator.unobtrusive.adapters.addBool('password');
As soon as I added this logic to the solution I got the error you saw on my Password and ConfirmPassword fields. Note that this occurred before the attribute was even used. Simply renaming the client side validator to 'passwordcheck' fixed the issue. I initially thought that the name 'password' possibly clashed with one of the pre-defined validators (cf. jQuery Validation Documentation) but this doesn't appear to be the case. I suspect now that it is a clash with the name or value for some input field attribute. Anyway, the solution was simply to rename the validator.
jQuery unobtrusive need data-msg for default validate message.
This is how to apply dynamic error message from your model to Html
$.validator.unobtrusive.adapters.add("requireif", function (options) {
$('#' + options.element.id).attr("data-msg", options.message);
// Add rule ...
});
You can change default warning message.
$.validator.addMethod("requireif", function (value, element, pair) {
// validate logic
return true/false;
}, "YOUR DEFAULT MESSAGE HERE");
Or
#Html.TextBoxFor(m => m.Property1, new { Class = "form-control", data_msg = "YOUR DEFAULT MESSAGE HERE" })
Or if you can put it directly to your Html like this.
<input class="form-control" data-msg="YOUR DEFAULT MESSAGE HERE"/>
I am learning ASP.NET MVC. I have to submit a to controller side after validation in client-side(in jquery). How this can be done? Should i use <form action="#" method="post"> instead of <form action="Controller/Method" method="post"> and add an event handler in click event of submit button of , to send via ajax etc? What should i do? pls help
You are on the right track, and what you suggested will work.
A better method would be to leave the original action intact, providing backwards compatibility to older browsers. You would then create the event handler as normal, and include code to prevent the default submit behavior, and use ajax instead.
$('#submitbutton').live('click', function(e){ e.preventDefault(); });
The easiest way to do this is to use the jQuery forms plugin.
This is my go-to plugin for this type of thing. Basically it will take your existing form, action url etc and convert the submission to an ajax call automatically. From the website:
The jQuery Form Plugin allows you to easily and unobtrusively upgrade
HTML forms to use AJAX. The main methods, ajaxForm and ajaxSubmit,
gather information from the form element to determine how to manage
the submit process. Both of these methods support numerous options
which allows you to have full control over how the data is submitted.
It is extremely useful for sites hosted in low cost web hosting
providers with limited features and functionality. Submitting a form
with AJAX doesn't get any easier than this!
It will also degrade gracefully if, for some reason, javascript is disabled. Take a look at the website, there are a bunch of clear examples and demos.
This is how I do:
In jQuery:
$('document').ready(function() {
$('input[name=submit]').click(function(e) {
url = 'the link';
var dataToBeSent = $("form#myForm").serialize();
$.ajax({
url : url,
data : dataToBeSent,
success : function(response) {
alert('Success');
},
error : function(request, textStatus, errorThrown) {
alert('Something bad happened');
}
});
e.preventDefault();
});
In the other page I get the variables and process them. My form is
<form name = "myForm" method = "post">//AJAX does the calling part so action is not needed.
<input type = "text" name = "fname"/>
<input type= "submit" name = "submit"/>
<FORM>
In the action page have something like this
name = Request.QueryString("fname")
UPDATE: As one of your comment in David's post, you are not sure how to send values of the form. Try the below function you will get a clear idea how this code works. serialize() method does the trick.
$('input[name=submit]').click(function(e){
var dataToBeSent = $("form#myForm").serialize();
alert(dataToBeSent);
e.preventDefault();
})
jQuery.validate stops my form from being submitted. I would like it to just show the user what is wrong but allow them to submit anyway.
I am using the jquery.validate.unobtrusive library that comes with ASP MVC.
I use jquery.tmpl to dynamically create the form and then I use jquery.datalink to link the input fields to a json object on the page. So my document ready call looks something like this.
jQuery(function ($) {
// this allows be to rebind validation after the dynamic form has been created
$("form").removeData("validator");
$("form").removeData("unobtrusiveValidation");
$.validator.unobtrusive.parse($("form"));
// submit the answers
$("form").submit(function(e) {
$("input[name=jsonResponse]").val(JSON.stringify(answerArray));
return true;
});
}
I note that there is an option
$("form").validate({ onsubmit: false });
but that seems to kill all validation.
So just to recap when my form is rendered I want to show all errors immediately but I don't want to prevent the submit from working.
So after some research (reading the source code) I found I needed to do 2 things
add the class cancel to my submit button
<input id="submitButton" type="submit" class="cancel" value="OK" />
This stops the validation running on submit.
To validate the form on load I just had to add this to my document ready function
$("form").valid();
Hope this helps someone else
I'm pretty new to this so here goes...
I'm using Visual Studio 05 (C#) and in my program I have a textbox and a submit button. The user enters an email address and results are then displayed from the database (this works) using an ASP gridview control.
What I am after is a simple piece of validation that if nothing has been entered into the textbox, display a message (or a popup) to say that something needs to be entered.
Many thanks!
Use the RequiredFieldValidator.
<asp:RequiredFieldValidator ID="Id1" runat="server" ErrorMessage="*" ValidationGroup="1" ControlToValidate="txt_Test" />
<asp:TextBox runat="server" ID="txt_Test" />
You can use the CustomValidator for displaying a popup, just provide it your own javascript function.
On the client side this bit of jQuery code could help
$(function(){
$('#id_of_form').submit(function(e){
if($.trim($('#id_of_textbox').val()) === '') {
alert('Textbox cannot be empty');
return false;
}
return true;
});
});
If you're using WinForms, you can do the following:
if (String.IsNullOrEmpty(txt_Test.Text.Trim()))
{
MessageBox.Show("You must enter something.");
}