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    <p>You have some scope issues. E.g.</p> <pre><code>function startClock() { minute = this.minute; element = this.element; minute = checkTime(minute); document.getElementById(element).innerHTML = minute; minute++; this.minute = minute; t=setTimeout(function(){startClock()},1000); this.counter = t; } </code></pre> <p>This will declare <code>minute</code>, <code>element</code> and <code>t</code> in global scope, thus every call to <code>startClock</code> will overwrite these values.</p> <p>Here is an refactored version:</p> <pre><code>function Clock(element) { this.element = element; this.minute = 0; this.toggle = true; this.active = false; } Clock.prototype = { startClock: function() { this.minute = this.checkTime(this.minute); this.element.innerHTML = this.minute; this.minute++; var that = this; this.counter = setTimeout(function(){that.startClock()},1000); }, checkTime = function(i) { if (i&lt;10) { i="0" + i; } return i; }, stopClock: function() { this.element.innerHTML = this.minute; clearTimeout(this.counter); }, clearClock: function() { this.element.innerHTML= "start"; this.element = ""; this.minute = 0; this.toggle = true; this.counter = null; } } function initClock(ele) { value = document.getElementById(ele).innerHTML; if (typeof window[ele] == 'undefined') { window[ele] = new Clock(document.getElementById(ele)); } if (value == "start" || window[ele].active == false) { window[ele].toggle = true; } else {window[ele].toggle = false;} if (window[ele].toggle) { window[ele].toggle = false; window[ele].active = true; if (value == "start") { window[ele].minute = 0; } window[ele].startClock(); } else { window[ele].toggle = true; window[ele].active = false; window[ele].stopClock(); } } </code></pre> <p>Read more about <a href="https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Working_with_Objects" rel="noreferrer"><em>Objects in JavaScript</em></a>.</p>
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    1. POHow do you create multiple timers on one page that operate independently -- javascript?
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    1. USFelix Kling
    1. USFelix Kling
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    1. POHow do you create multiple timers on one page that operate independently -- javascript?
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    1. COthanks Felix for the quick answer...I will try it in the morning and let you know how it goes...Thanks!
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      1. USAnthony H
    2. CO@Anthony H: Is totally fine for me :) Good night!
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      1. USFelix Kling
    3. COI gave an up-vote, however: `function(){this.startClock()}` is wrong. The `this` inside the anonymous function will be off.
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