javascript - how to include js file in an html file? -

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i want implement virtual keyboard in project. never included before referred link , tried below:

<head> <script type="text/javascript" src="vkboards.js"></script>      <script>      // minimal callback function:     function keyb_callback(char)     {         // bind vkeyboard <textarea>          // id="textfield":         var text =             document.getelementbyid("textfield"), val = text.value;          switch(ch)         {             case "backspace":             var min=(val.charcodeat(val.length - 1) == 10) ? 2 : 1;             text.value = val.substr(0, val.length - min);             break;             case "enter":                text.value += "\n";                break;             default:                text.value += ch;         }     }      </script> </head>

in style:

#keyboard {     width:800px;     height:400px;     background-color:#f2f3f1;     margin:1px auto;     border-radius:25px;     box-shadow:5px 5px 5px grey; }

in body:

<body onload="new vkeyboard("keyboard", keyb_callback);">     <textarea id="textfield" rows="1" cols="25"></textarea>     <div id="keyboard"></div>     </div> </body>

i tried this,searched net nothing made work. please go through code , me correct it. appreciated.

you might try changing quotes around keyboard single quotes this.

<body onload="new vkeyboard('keyboard', keyb_callback);">

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