prevent Duplicate values using Jquery Validation

Question

I have form and form text field which generates dynamically using JSP. And I\'m using Jquery validation but want to add functionlaty to prevent duplicate entry in the form.<

Answer 1

I'm pretty new to jquery validation, but I had a similar issue to solve, I came up with the following solution (using previous answers for inspiration!):

Javascript:

jQuery.validator.addMethod("unique", function(value, element, params) {
    var prefix = params;
    var selector = jQuery.validator.format("[name!='{0}'][unique='{1}']", element.name, prefix);
    var matches = new Array();
    $(selector).each(function(index, item) {
        if (value == $(item).val()) {
            matches.push(item);
        }
    });

    return matches.length == 0;
}, "Value is not unique.");

jQuery.validator.classRuleSettings.unique = {
    unique: true
};

Usage:

Demo here: http://jsfiddle.net/mysteryh/bgzBY/