javascript setInterval in array - Stack Overflow

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I created an array and inserted a setInterval in it, but tmp[0] doesn't work

tmp = new Array();
v = new Array();
for(i=0; i<2; i++){
j = 0;
tmp[i] = setInterval("if(j<10+(i*5)){alert(i+' '+j);j++;}else{clearInterval(tmp[i])}", 1000);
}

I created an array and inserted a setInterval in it, but tmp[0] doesn't work

tmp = new Array();
v = new Array();
for(i=0; i<2; i++){
j = 0;
tmp[i] = setInterval("if(j<10+(i*5)){alert(i+' '+j);j++;}else{clearInterval(tmp[i])}", 1000);
}

• javascript
• arrays
• setinterval

Share Improve this question Follow asked Aug 30, 2011 at 13:10 R. 久蔵R. 久蔵 18733 gold badges55 silver badges1616 bronze badges 3

• 3 What did you expect to happen? – Blazemonger Commented Aug 30, 2011 at 13:12
• It should alert: "0 0" "1 0" "0 1" "1 1" "0 2" "1 2" ... – R. 久蔵 Commented Aug 30, 2011 at 13:18
• @キューゾ リファイ see the update to my answer.. – Naftali Commented Aug 30, 2011 at 13:26

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 5

Do Not use eval. Try this:

var tmp = new Array();
var v = new Array();
for (i = 0; i < 2; i++) {
    var j = 0;
    tmp[i] = setInterval(function () {
        if (j < 10 + (i * 5)) {
            alert(i + ' ' + j);
            j++;
        } else {
            clearInterval(tmp[i])
        }
    }, 1000);
}

Fiddle: http://jsfiddle/FKEL6/ (it is annoying with the popups, just so you are aware.)

---

This might do what you want it to do:

var tmp = new Array();
var v = new Array();
var i = 0;
for (i = 0; i < 2; i++) {
    createTmp(i);
}

function createTmp(p){
    var j = 0;
    tmp[p] = setInterval(function () {
        if (j < 10 + (p * 5)) {
            alert(p + ' ' + j);
            j++;
        } else {
            clearInterval(tmp[p])
        }
    }, 1000);
}
console.log(tmp);

Fiddle: http://jsfiddle/FKEL6/5/ (also has annoying alerts)

The output of such a thing is:

2 0
2 1
2 2
2 3
2 4
2 5
...
2 18
2 19

etc, which is correct. It stops when j < 20.

But at the end your timer is still going on and all you are doing is calling clearInterval(tmp[2]) over and over, twice a second.

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