Client-side validation with Jquery is failing to function properly

Currently, I am experimenting with the jquery.validate.unobtrusive.js plugin to dynamically generate form fields. Here is an example of how I'm creating a textarea field:

var message = $("<textarea id='test'></textarea>");
$(message).attr("data-val", "true")
.attr("data-val-number", "The field CustomerId must be a number.")
.attr("data-val-required", "The CustomerId field is required.");

var span = $('<span class="field-validation-valid" data-valmsg-replace="true"></span>');
$(span).attr("data-valmsg-for", $(message).attr("id"));

var form = $("<form action='url'></form>");

$(form).append(message,span);

Even though I have embedded both jquery.validate and jquery.validate.unobtrusive javascript files, the textarea field does not validate upon form submission. Can anyone identify what might be going wrong in this setup?

Answer №1

When adding new elements dynamically to the DOM, it is important to reparse the unobtrusive validation rules to ensure proper registration. After appending the form to the DOM, remember to use the $.validator.unobtrusive.parse method to notify the client validation framework about these changes:

...
$(form).append(message, span);
$.validator.unobtrusive.parse(form);

If you are only adding input elements dynamically to an existing form in the DOM that already has client-side validation registered, make sure to remove previous rules for that form:

// Adding some form elements to an existing form ...

$(form).removeData('validator').removeData('unobtrusiveValidation');
$.validator.unobtrusive.parse(form);

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