ajax - javascript keyboard functions -


how can make function when press down example "a" key on keyboard pushes down on , sends out signal nupp('/ts'). on "a" key relase should top sending signal nupp('/ts').

 <html>   <head>  <script src=\"https://code.jquery.com/jquery-2.2.4.min.js\"></script>  <script>  client.println("function nupp(url){ $.ajax(url); }"</script>   <button type=\"button\" onclick=\"nupp('/ts');\">on</button>   </head>  <body>

you can this:

function checkkeydown(key) {     if (key.keycode == "38") {         $.ajax("/f");     } else if (key.keycode == "37") {         $.ajax("/l");     } else if (key.keycode == "39") {         $.ajax("/r");     } else if (key.keycode == "40") {         $.ajax("/b");     } }  function checkkeyup(key) {     if (key.keycode == "38" || key.keycode == "37" || key.keycode == "39" || key.keycode == "40") {         $.ajax("/s");  //stop     } }

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