How to create a custom validation in Bootstrap Validation

Question

My Goal is to validate a specific text field where this field is dependent to the value of the other element.

For example i have select tag and input text tag,

input text is required when select tag has a selected value.

hope someone could help.

Answer 1

Take a look at

http://bootstrapvalidator.com/

In our project we are using, Backbone validator, integrated with Bootstrap

https://github.com/thedersen/backbone.validation

Sample of integration Backbone.validation & Bootstrap

[jsfiddle.net/thedersen/c3kK2/][1]

That is if you are using Backbone :)

For bootstrapvalidator there is a callback method for validation

http://bootstrapvalidator.com/validators/callback/

From example:

  <input type="text" class="form-control" name="captcha"
                data-bv-callback="true"
                data-bv-callback-message="Wrong answer"
                data-bv-callback-callback="checkCaptcha" />

And JS

function checkCaptcha(value, validator) {
    // Determine the numbers which are generated in captchaOperation
    var items = $('#captchaOperation').html().split(' '),
        sum   = parseInt(items[0]) + parseInt(items[2]);
   return value == sum;
};

$(document).ready(function() {
    // Return a random number between min and max
    function randomNumber(min, max) {
       return Math.floor(Math.random() * (max - min + 1) + min);
    };

    // Generate a sum of two random numbers
    function generateCaptcha() {
        $('#captchaOperation').html([randomNumber(1, 100), '+', randomNumber(1, 200), '='].join(' '));
    };

    generateCaptcha();

    $('#callbackForm').bootstrapValidator();
});

You can implement arbitrary validation with it.

So your validation can be implemented through some global function

With HTML

  <input type="text" class="form-control" name="captcha"
                data-bv-callback="true"
                data-bv-callback-message="Wrong answer"
                data-bv-callback-callback="specialValidation" />

with JS

 function specialValidation(value, validator) {
    // Determine the numbers which are generated in captchaOperation
    var items = $('#otherField').txt();
    return value == sum;
};

And you need to be creative with element attributes, to link related elements correctly.