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<button class="ladda-button ladda-button-demo btn btn-primary"  data-style="zoom-in">Submit</button>

var l = $( '.ladda-button-demo' ).ladda();
      l.click(function()

          // Start loading
          l.ladda( 'start' );

          // Do something in backend and then stop ladda
          // setTimeout() is only for demo purpose
          setTimeout(function()
              l.ladda('stop');
          },2000)

      });