JSFiddle - React, Tailwind, and code Playground

by riateche

HTML

<script type="text/javascript" src="http://jzaefferer.github.com/jquery-validation/jquery.validate.js"></script>

<form action="results.php" target="_blank" id="FORMMM">

    <div style="clear:both">
    <label for="groceries">Groceries</label>
    <div style="float:right">
            $<input name="groceries" type="text" class="at_least_one idleField"></div>
    </div>
    <div style="clear:both">
        <label for="gas">Gas</label>
        <div style="float:right">
            $<input name="gas" type="text" class="at_least_one idleField">
        </div>
    </div>
    <div style="clear:both">
        <label for="hotels">Hotels</label>
        <div style="float:right">
            $<input name="hotels" type="text" class="at_least_one idleField">
        </div>
    </div>
    <div id="button">
        <input name="" type="submit" value="Calculate" class="calc_button" style="cursor:hand">
    </div>
    </form>
<div id="errorContainer">
    <h4>errors</h4>
    <ol>
    </ol>
</div>

JavaScript

jQuery.validator.addMethod("require_from_group", function(value, element, options) {
  var numberRequired = options[0];
  var selector = options[1];
  var fields = $(selector, element.form);
  var filled_fields = fields.filter(function() {
    // it's more clear to compare with empty string
    return $(this).val() != ""; 
  });
  var empty_fields = fields.not(filled_fields);
  // we will mark only first empty field as invalid
  if (filled_fields.length < numberRequired && empty_fields[0] == element) {
    return false;
  }
  return true;
// {0} below is the 0th item in the options field
}, jQuery.format("Please fill out at least {0} of these fields."));

$(document).ready(function(){
  var container = $('#errorContainer');
  $("#FORMMM").validate(  {

    // We must to force validation of entire form because
    // when we remove value from 2-nd field 
    // the 1-st field becomes invalid.
    onfocusout: function() { $("#FORMMM").valid() },
    onkeyup: function() { $("#FORMMM").valid() },

    rules: {
      // note: you can use variable to avoid repeating 
      // of the same code
      groceries: { 
        number: true,
        require_from_group: [1, ".at_least_one"]
      },
      gas: {
        number: true,
        require_from_group: [1,".at_least_one"]
      },
      hotels: {
        number: true,
        require_from_group: [1,".at_least_one"]
      }
    },
    success: function(label) {  
      label.html(" ").addClass("checked"); 
    },
    errorContainer: container,
    errorLabelContainer: $("ol", container),
    wrapper: 'li',
    meta: "validate"
  });
});