javascript - Why does my for loop come once? -

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i've got code loop in function..

look bit code please:

<!doctype html> <html> <head>     <title>test</title> </head> <body>     kies een tafel:     <select id="tafels">     <option value="1">tafel 1</option>     <option value="2">tafel 2</option>     <option value="3">tafel 3</option>     <option value="4">tafel 4</option>     <option value="5">tafel 5</option>     <option value="6">tafel 6</option>     <option value="7">tafel 7</option>     <option value="8">tafel 8</option>     <option value="9">tafel 9</option>     <option value="10">tafel 10</option>     </select>     <input type="submit" id="submit" value="bereken" onclick="tafel23();">     <div id="asd">     </div>     <script>             function tafel23(){          var value = document.getelementbyid('tafels').value;         var value1 = parseint(value);         var teller = 0;          for(teller = 1; teller <= 10; teller++){             document.getelementbyid('asd').innerhtml=(value1 + " x " + teller + " = " + teller * value1 + "<br/>");         }         }     </script> </body> </html>

my loop come onces when click submit button... when innerhtml+= works, whole loop appearing, when press submit button again , again, loop stacking.. got problem is, when press submit button loop appear, not again , again..

thanks in advance guys!<3

try clearing div before execute loop:

function tafel23(){      var value = document.getelementbyid('tafels').value;     var value1 = parseint(value);     //you might check value1 nan here      document.getelementbyid('asd').innerhtml=""; //clear out     for(var teller = 1; teller <= 10; teller++){         document.getelementbyid('asd').innerhtml += value1 + " x " + teller + " = " + teller * value1 + "<br/>";     } }

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