Using jquery Validation 'greaterthan' function

Question

I am using the jQuery Validation method "greaterThan" as described by Jon and Mike E. in Validate that end date is greater than start date with jQuery

But when I send over: EndDate: { greaterThan: "#StartDate" } The result message is 'Must be greater than #StartDate'. I would like to do something like EndDate: { greaterThan: ["#StartDate","Start Date"] }

But am unsure how to modify the "greaterThan" method. I tried changing the 'value' to 'options[0]' but that was a fail.

Any suggestions? Thanks. Sam.

Answer 1

There is no such rule or method called greaterThan within the jQuery Validate plugin. The answer you referenced is merely using the plugin's .addMethod() method to create a custom rule called greaterThan.

Quote OP:

"But when I send over: EndDate: { greaterThan: "#StartDate" } The result message is 'Must be greater than #StartDate'. I would like to do something like EndDate: { greaterThan: ["#StartDate","Start Date"] }."

Your question is written very poorly. However, if I understood it correctly,

• See the second example in the documentation, which correctly shows how to use multiple parameters within the function and error message.

• Assuming you want to pass a second parameter in order to improve the error message, simply access this second parameter using {1} within the message.

• Within the function, access the first parameter using params[0].

In other words...

When you declare your rule with multiple parameters as in this example...

rules: {
    field: {
        customRule: [x,y]
    }
} 

Inside jQuery.validator.addMethod("customRule", function(value, element, params){...}, "message"), the parameters are accessed as follows...

within the function:

params[0] equals x
params[1] equals y

within the message:

{0} equals "x"
{1} equals "y"

"Must be between {0} and {1}" will display as "Must be between x and y"

---

Assuming the function from the linked answer is correct, apply the edits as follows...

jQuery.validator.addMethod("greaterThan", function(value, element, params) {    
    if (!/Invalid|NaN/.test(new Date(value))) {
        return new Date(value) > new Date($(params[0]).val());
    }    
    return isNaN(value) && isNaN($(params[0]).val()) || (Number(value) > Number($(params[0]).val())); 
},'Must be greater than {1}.');

Declare the rule as you requested...

$("form").validate({
    rules: {
        EndDate: {
            greaterThan: ["#StartDate","Start Date"]
        }
    }
});

---

EDIT:

Based on comments, simply check to see if the first field is empty before doing anything else...

jQuery.validator.addMethod("greaterThan", function(value, element, params) {
    if ($(params[0]).val() != '') {    
        if (!/Invalid|NaN/.test(new Date(value))) {
            return new Date(value) > new Date($(params[0]).val());
        }    
        return isNaN(value) && isNaN($(params[0]).val()) || (Number(value) > Number($(params[0]).val()));
    };
    return true; 
},'Must be greater than {1}.');

Answer 2

Let make it simple.

use min and max methd.

amount: {
  min: 1,
  max: 10
}

refer to: https://jqueryvalidation.org/min-method/