jQuery Validate addMethod() argument always return true

Question

I have a custom validation rule, so I am using to check it using addMethod. On rules, I am sending some JSON formatted string to be fetched on the addMethod.

$.validator.addMethod("chkduplicate", function(value, element, params) {
    console.log(params);
}, "This field value already exists.");

Rules should look like:

rules: {
  meter_id: {
    required: true,
    digits: true,
    chkduplicate: '{ "table_name": "users", "fld_name": "user_id"}'
  }
}

here chkduplicate is the parameter I am sending to addMethod, but when I try to console the params, it always returns true, but it should be {"table_name": "users", "fld_name": "user_id"}'

I am using this plugin

why are you trying to JSON.parse params? It should already be an object. I see no JSON here. JSON is a textual representation of object data...but your rules above looks like an actual JavaScript object literal, to me. And in any case unless you are getting the rules data from somewhere else (e.g. fetching it from a remote server via AJAX) then there would be no reason to need JSON. — ADyson
– ADyson, Commented Feb 1, 2019 at 14:06
ok, I removed JSON.parse, however, there is no issue with this, I am saying params is the problem — Jothi Kannan
– Jothi Kannan, Commented Feb 1, 2019 at 14:08
Your addMethod/validation call looks like what? My guess is the issue is there and not in the code you showed us. — epascarello
– epascarello, Commented Feb 1, 2019 at 14:08
Just write chkduplicate: { "table_name": "users", "fld_name": "user_id"} without the single quotes...there's no need to make it a string as far as I can see — ADyson
– ADyson, Commented Feb 1, 2019 at 14:09
P.S. I'm guessing this is some kind of custom validation plugin...so it would really help if you tell us what plugin you're using, then we can understand how it's supposed to actually work. — ADyson
– ADyson, Commented Feb 1, 2019 at 14:10

Daut · Accepted Answer · 2019-02-01 14:37:44Z

2

params Type: Object parameters specified for the method, e.g. for min: 5, the parameter is 5, for range: [1, 5] it's [1, 5]

Yours is string; try this

rules: {
  meter_id: {
    required: true,
    digits: true,
    chkduplicate: { "table_name": "users", "fld_name": "user_id"}
  }
}

answered Feb 1, 2019 at 14:37

Daut

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3 Comments

Daut Over a year ago

@JothiKannan Does it still print true?

ADyson Over a year ago

@JothiKannan see my comment above on the main thread. In theory your code should be fine (and so should the code in this answer). I made a demo to prove it. So if you still have a problem, you'll need to add enough of your real code into the question such that we can reproduce the issue. And/or you could update the demo page with your code, such that it crashes. Then we can see what to fix. At the moment, you haven't given us the key piece of information to make it behave the way you're describing.

Daut Over a year ago

@JothiKannan Please see here jsfiddle.net/dubxv0eL I have made an example Edit to make it look like your code

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