Series: Run the functions in the tasks collection in series, each one running once the previous function has completed. Waterfall: Runs the tasks array of functions in series, each passing their results to the next in the array. In short: Are equal, but waterfall pass the result of task to the next task.

Read this tutorial: https://paulund.co.uk/use-php-to-detect-an-ajax-request

jQuery has a .keypress method accepting no arguments that simulates a keypress. $( "#target" ).keypress(); Will trigger a keypress on #target If you'd like to also select which key was pressed, you can use .trigger. This example is from the docs : var e = $.Event( "keydown" , { keyCode: 8 }); $( "body" ).trigger(e); The key code 8 is the key code for backspace in JavaScript. Let me know how that works for you :) If you need a function: function simulateKeyPress(character) { jQuery.event.trigger({ type : 'keypress' , which : character.charCodeAt(0) }); }