Prevent double submission of forms in jQuery

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If using AJAX to post a form, set async: false should prevent additional submits before the form clears:

$("#form").submit(function(){
    var one = $("#one").val();
    var two = $("#two").val();
    $.ajax({
      type: "POST",
      async: false,  // <------ Will complete submit before allowing further action
      url: "process.php",
      data: "one="+one+"&two="+two+"&add=true",
      success: function(result){
        console.log(result);
        // do something with result
      },
      error: function(){alert('Error!')}
    });
    return false;
   }
});

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