Magento 2 - Validate input number and allow only two digits after decimal point and submit form via AJAX

Question

Code Snippet

<form data-mage-init='{"validation": {}}' data-hasrequired="<?php echo __('* Required Fields') ?>" name="vendor" method="POST" id="vendor" autocomplete="off">
        <div class="well">
        <strong><?php echo __('Enter Height:')?></strong>
        <input type="text"
               id="height" 
               name="height"
               placeholder="Please enter numeric value only"
               data-validate="{required:true, 'validate-number':true}" class="input-text form-control input-md">
            <button type="submit" class="action primary" id="calculateTotalSubmit" name="calculate-total-submit"><?php echo __('Calculate Total')?></button>
        </div>
    </form>

I have given input value required true and validate-number, although it is validating required field input before form is post, it is not validating the required number and showing validation message after form is post. How could I add below validations using Magento 2 form validation rules

As you can see in image, it shows number validation message but form is also submitted.

Using this script to submit form via ajax, validation is not working

<script>
require(['jquery'],function(){
    jQuery(document).ready(function() {

        jQuery("#form-id").submit(function(){
            var height = jQuery("input[name='height']").val();
            var url = "MYURL";
            jQuery.ajax({
                url: url,
                type: "POST",
                data: {height:height},
                showLoader: true,
                cache: false,
                success: function(response){
                    jQuery("#result-data").html(response.output);
                }
            });
            return false;

        });
    });
});
</script>

• Before form post, validate-number and allow only two digits after decimal point before form is submitted?

Answer 1

You can use pattern for validate by your own regular expression:

data-validate="{'required':true, 'pattern':/^\d+(\.\d{1,2})?$/, 'validate-greater-than-zero':true}"

You can check validate form using .valid() method:

<script>
    require(['jquery'], function($) {
        $(function() {
            $('#form-id').submit(function() {
                if($('#form-id').valid()) {
                    ... ajax query ...
                }
                return false;
            });
        });
    });
</script>

Answer 2

You can add this js function in your phtml file.

<script type="text/javascript">
function saveForm()
{
    var dataForm = jQuery('#vendor');
    dataForm.mage('validation');
    if (jQuery('#vendor').valid()) {
         jQuery('#calculateTotalSubmit').attr('disabled',true);
         jQuery('#vendor').submit();
    }
}
</script>

you also need to change your button code like below

<button class="action primary" onclick="saveForm()" id="calculateTotalSubmit" name="calculate-total-submit"><?php echo __('Calculate Total')?></button>