How can I validate that the max field is greater than the min field?

Question

I have a few sets of min and max fields in a form, where the user can specify a range by filling in a min and a max. I\'m using jQuery\'s Validate plugin for my form validat

Answer 1

Ok, here's something that should work. The rule is based on the built in equalTo method:

$.validator.addMethod("greaterThan", function (value, element, param) {
    var $min = $(param);

    if (this.settings.onfocusout) {
        $min.off(".validate-greaterThan").on("blur.validate-greaterThan", function () {
            $(element).valid();
        });
    }

    return parseInt(value) > parseInt($min.val());
}, "Max must be greater than min");

Example: http://jsfiddle.net/tUPQc/2/

---

To make the rule a bit more generic, you'll have to need to use addClassRules:

$.validator.addMethod("greaterThan", function (value, element, param) {
    var $element = $(element)
        , $min;

    if (typeof(param) === "string") {
        $min = $(param);
    } else {
        $min = $("#" + $element.data("min"));
    }

    if (this.settings.onfocusout) {
        $min.off(".validate-greaterThan").on("blur.validate-greaterThan", function () {
            $element.valid();
        });
    }
    return parseInt(value) > parseInt($min.val());
}, "Max must be greater than min");

$.validator.addClassRules({
    greaterThan: {
        greaterThan: true
    }
});

Then in your HTML:

<input id="maxTruck" name="maxTruck" type="text" class="number greaterThan" data-min="minTruck" />

Example: http://jsfiddle.net/tUPQc/3/

Answer 2

Simple and good way to use addmethod

$.validator.addMethod("greaterThan",

function (value, element, param) {
  var $min = $(param);
  if (this.settings.onfocusout) {
    $min.off(".validate-greaterThan").on("blur.validate-greaterThan", function () {
      $(element).valid();
    });
  }
  return parseInt(value) > parseInt($min.val());
}, "Must be greater than to field 1");

validating code

filed2_name: {

            greaterThan: '#filed1_id'
        },  

second i prefer first

$.validator.addMethod('le', function(value, element, param) {
      return this.optional(element) || value <= $(param).val();
}, 'Invalid value');
$.validator.addMethod('ge', function(value, element, param) {
      return this.optional(element) || value >= $(param).val();
}, 'Invalid value');

$('form').validate({rules: {
            fieldName1: {le: '#fieldID2'},
            fieldName2: {ge: '#fieldID1'},
             ...
      },
      messages: {
            fieldName1: {le: 'Must be less than or equal to field 2'},
            fieldName2: {ge: 'Must be greater than or equal to field 1'},
            ...
      }
});