html - Javascript: Input bar isn't working or giving any result -


i made program asks user how many input bars wants display , user has type in values input bars , click verify issue having whenever click on verify, nothing happens. error:

uncaught typeerror: cannot read property 'value' of null

whenever click on verify.

here codes: 

<html>    <head>      <script language="javascript">        var x = [];        var choose;        var i;        var xar=[];        choose=parsefloat(prompt("how many inputs u want display"));        for(i=0;i<choose;i++)          x[i]=document.getelementbyid("cont"+i).style.visibility="visible";          function hola() {          for(i=0;i<choose;i++)            document.getelementbyid("cont"+i).style.visibility="visible";          }            function verify(){          for(i=0;i<choose;i++){            xar[i]=document.getelementbyid("usernumber"+i).value;          }          for(i=0;i<choose;i++)            if(xar[i]==i)              alert("good");            else              alert("wrong");        }        </script>    </head>      <body>      <input type="button" onclick="hola()" value="hidefield0" id="boton0">        <div id="cont0" style="visibility: hidden;">        <input type="text" id="usernumber" class="something">      </div>      <input type="button" onclick="hola()" value="hidefield2" id="boton1">      <div id="cont1" style="visibility: hidden;" class="something">        <input type="text" id="username2">      </div>        <input type="button" onclick="hola()" value="hidefield1" id="boton2">        <div id="cont2" style="visibility: hidden;" class="something">        <input type="text" id="username3">      </div>      <input type="button" onclick="hola()" value="hidefield3" id="boton3">        <div id="cont3" style="visibility: hidden;" class="something">        <input type="text" id="username4">      </div>      <input type="button" onclick="hola()" value="hidefield4" id="boton4">        <div id="cont4" style="visibility: hidden;" class="something">        <input type="text" id="username5">      </div>      <input type="button" onclick="hola()" value="hidefield5" id="boton5">        <div id="cont5" style="visibility: hidden;" class="something">        <input type="text" id="username6">      </div>      <input type="button" id="verifybtn" value="verify" onclick="verify()">    </body>    <html>

the script failing when reaches portion:

 document.getelementbyid("usernumber"+i)

this indicates there no element called usernumber + i (i.e. "usernumber3") call .value property of (cannot read property 'value' of null) .

and that's because have elements ids of "username2, username3, username4, etc." , "usernumber", not "usernumber" plus number.

      var x = [];        var choose;        var i;        var xar=[];        choose=parsefloat(prompt("how many inputs u want display"));        for(i=0;i<choose;i++)          x[i]=document.getelementbyid("cont"+i).style.visibility="visible";          function hola() {          for(i=0;i<choose;i++)            document.getelementbyid("cont"+i).style.visibility="visible";          }            function verify(){          for(i=0;i<choose;i++){            xar[i]=document.getelementbyid("usernumber"+i).value;          }          for(i=0;i<choose;i++)            if(xar[i]==i)              alert("good");            else              alert("wrong");        }
    <input type="button" onclick="hola()" value="hidefield0" id="boton0">        <div id="cont0" style="visibility: hidden;">        <input type="text" id="usernumber" class="something">      </div>      <input type="button" onclick="hola()" value="hidefield2" id="boton1">      <div id="cont1" style="visibility: hidden;" class="something">        <input type="text" id="usernumber2">      </div>        <input type="button" onclick="hola()" value="hidefield1" id="boton2">        <div id="cont2" style="visibility: hidden;" class="something">        <input type="text" id="usernumber3">      </div>      <input type="button" onclick="hola()" value="hidefield3" id="boton3">        <div id="cont3" style="visibility: hidden;" class="something">        <input type="text" id="usernumber4">      </div>      <input type="button" onclick="hola()" value="hidefield4" id="boton4">        <div id="cont4" style="visibility: hidden;" class="something">        <input type="text" id="usernumber5">      </div>      <input type="button" onclick="hola()" value="hidefield5" id="boton5">        <div id="cont5" style="visibility: hidden;" class="something">        <input type="text" id="usernumber6">      </div>      <input type="button" id="verifybtn" value="verify" onclick="verify()">


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