Question

http://jsfiddle.net/xDWLQ/

JavaScript:

var quotes = new Array();
quotes[0] = "message 0";
quotes[1] = "message 1";

var qText = document.getElementById('qText');
for (i = 0; i < quotes.length; i++) {
    setInterval(function() { qText.innerHTML = quotes[i]; }, 2000);
}​

HTML:

<p class="qText" id="qText">Predefined text</p>​

The innerHTML of qText changes to undefined, instead of changing into quotes[0], followed by quotes1. Now I tried debugging it by using alert() inside the setInterval function to give me the index of the for loop, and it said “2” both times. So, how would I have the for loop paused instead of setInterval creating new threads and incrementing the index?

Answer 1

I think this is you want, not a loop.

var quotes = ["message 0", "message 1"];
var qText = document.getElementById('qText');
var i = 0;
var len = quotes.length;

setInterval(function() {
   qText.innerHTML = quotes[i++];
   if (i === len) i = 0; 
}, 2000);