kendoDOMValidation.js

var validator = $('#form').kendoValidator({
  messages: {
    text: 'Field must contain at most 20 symbols.',
    grid: 'The grid must contain at least two rows.'
  },
  rules: {
    text: function(item) { 
      if (item.is('[name=text]')) {
        return item.val().length < 20;
      }
      return true;
    },
    grid: function(item) {
      if (item.is('[data-role=grid]')) {
        var grid = item.getKendoGrid();
        return grid.dataItems().length > 1;
      }
      return true;
    }
  }
}).data('kendoValidator');

markup.html

<form id="form">
  <textarea name="text" rows="1" cols="40">Our world is a magical smoke screen</textarea>
  <div id="grid"></div>
  <button id="validate">Validate</button>
</form>

validate.js

var isValid = validator.validate() && validator.validateInput('#grid');