Array initialization

[Philosophaie]

I can not get arr1 to initialize. I keep getting a null in the textbox sum.

<script type="text/javascript">
     function getarray(){
          var arr1 new Array(4);
          var arr1 = (1,2,3,4);
          var sum = 0;
          for (i=0; i<=3; i++){
               sum = sum + arr1[i];
          }
     window.document.myform.sum.value = sum;
     }
</script>

[JMRKER]

I can not get arr1 to initialize. I keep getting a null in the textbox sum.

<script type="text/javascript">
     function getarray(){
          var arr1 new Array(4);
          var arr1 = (1,2,3,4);
          var sum = 0;
          for (i=0; i<=3; i++){
               sum = sum + arr1[i];
          }
     window.document.myform.sum.value = sum;
     }
</script>

Try...

<script type="text/javascript">
     function getarray(){
          var arr1 = [1,2,3,4];
          var sum = 0;
          for (i=0; i<arr1.length; i++){
               sum = sum + arr1[i];
          }
       return sum;  // for testing
//     window.document.myform.sum.value = sum;
     }
     alert(getarray());  // for testing
</script>

Note:
1. You don't neet to initialize var arr1 twice.
2. 1st var assignment needs an equal sign and does not need (4).
3. 2nd var assignment is a short-cut assignment with [ ] characters.
4. Reference element with [ ] characters, not ( ).
5. You defined the function, but never called it to execute.

[nap0leon]

Missing an "=" in your 'var arr1' line
and use [] to indicate array items

<form name="myform">
<input type="text" name="sum" value="">
</form>
<script type="text/javascript">
     function getarray(){
          var arr1 = new Array()
          var arr1 = [1,2,3,4];
          var sum = 0;
          for (i=0; i<=3; i++){
               sum = sum + arr1[i];
          }
     window.document.myform.sum.value = sum;
     }
getarray();
</script>