CODEWITHSUNDEEP
jqueryvalidationasp.net-mvc-3
amit_g
amit_g

Reputation: 31250

jQuery Validation plugin's method throws error when called on empty collection

jQuery plugin's Validation's method Valid() throws an error this[0] is undefined when called on empty collection. I thought jQuery convention is not to do anything on empty collection, certainly not throw any error or may be I am missing something. Could someone shed light on it please?

Demo

Code fragment from the plugin. this[0] - shown below - throws the error as the collection is empty.

// http://docs.jquery.com/Plugins/Validation/valid
valid: function() {
    if ( $(this[0]).is('form')) {
        return this.validate().form();
    } else {
        var valid = true;
        var validator = $(this[0].form).validate(); // This is the line that throws error
        this.each(function() {
            valid &= validator.element(this);
        });
        return valid;
    }

Upvotes: 1

Views: 1108

Answers (1)

mcgrailm
mcgrailm

Reputation: 17640

what I do is just add class to inputs that i want to have validate then my form has an id and i call validate to it

  $("#myform").validate()

here is one example of how i use form validation

i also recommend looking at the demos

generally speaking of standard jquery if you apply say like a click event to an element that doesn't exist you don't get errors jquery skips over it. that said maybe validate should do the same but it apparently does not so I would suggest doing it the way I posted or check for the length of the selector before applying validate

Upvotes: 1

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