Question

I have javascript code some thing like this —

var count=3;
var pl=new Array(count);
var il=new Array(count); 

pl.push('<?php echo $var1; ?>');
il.push('<?php echo $var2; ?>');

Why is this not working?

But if I try some thing like this

pl[0]='<?php echo $var1; ?>';

It works. Can some one point out the problem?

Thanks

Answer 1

By using the Array constructor you are creating an array with a number of “slots” already defined. In your case, the arrays both have 3 elements when you create them (the value of each element is undefined.)

When you use push, you add an extra element to that array. When you set the element at a specific index, you just set the value of that element.

I would suggest not using the Array constructor, and instead creating array literals:

var pl = [];
var il = [];
pl.push('<?php echo $var1; ?>');
il.push('<?php echo $var2; ?>');

This time, the arrays are created with no elements, so when you use push you are pushing an element into index 0, instead of 4.