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POJavascript OOP / Classes - multiple instances share same data
 

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  1. POJavascript OOP / Classes - multiple instances share same data
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    <p>I am writing some oop javascript code. I have a couple of instances of a class and have put different data into each. Unfortunately, as you will see with the example below, they appear to share the same data.</p> <p>Is it possible to get two separate instances of my class? How would it be done.</p> <p>Index.html</p> <pre><code> &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-type" content="text/html; charset=utf-8"&gt; &lt;script type="text/javascript" src="test.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; debugger; // Do this because a page resart seems to keep old data function SetGlobals() { var ui; var el; // Arr00 ui = document.getElementById("Arr00"); el = arr0.arrayGet(0); ui.innerHTML = el.m_String; // Arr01 ui = document.getElementById("Arr01"); el = arr0.arrayGet(1); ui.innerHTML = el.m_String; // Arr10 ui = document.getElementById("Arr10"); el = arr1.arrayGet(0); ui.innerHTML = el.m_String; // Arr11 ui = document.getElementById("Arr11"); el = arr1.arrayGet(1); ui.innerHTML = el.m_String; } function MyOnLoad() { SetGlobals(); } &lt;/script&gt; &lt;/head&gt; &lt;body onload="MyOnLoad()" style="width:100%; height: 100%; padding: 0 0 0 0; margin: 0 0 0 0; overflow: hidden; background:#000000"&gt; &lt;div id="divScreen" style="display: block; width:100%; height="100%"&gt; &lt;div id="divMenu" style='float: left; background:#00FF00; border-color: #000000; border-width: 1px;'&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt; Array 0/String 0: &lt;label id="Arr00"&gt;&lt;/label&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; Array 0/String 1: &lt;label id="Arr01"&gt;&lt;/label&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; Array 1/String 0: &lt;label id="Arr10"&gt;&lt;/label&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; Array 1/String 1: &lt;label id="Arr11"&gt;&lt;/label&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/div&gt; &lt;div id="divMain" style='height: 100%; background:#0000FF; margin-left: 250px; border-color: #000000; border-width: 1px;'&gt; &lt;/div&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Test.js</p> <pre><code>var BaseARR = function() { _arr = []; // new Array(); // Public functions that can access private members this.Add = function(arg) { var i, addAt; if(arg==null || (addAt = FindEnterPos(arg))&lt;0) return false; // since adding and not deleting anything, nothing of value will be returned _arr.splice(addAt, 0, arg); return true; }; // This finds the entry position for in FindEnterPos = function(arg) { return (_arr.length + 1); }; this.arrayGet = function(i) { return ((_arr != null &amp;&amp; i &gt;= 0 &amp;&amp; i &lt; _arr.length) ? _arr[i] : null); }; }; var stringId = function(id, str) { // public has a this. , privates have just var this.m_Id = id; // int this.m_String = str; // string }; // This so allow statics var stringIdARR = function() { BaseARR.call(this); }; </code></pre>
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    1. COYou're never calling ``new BaseARR()`` anywhere. You need to use the ``new`` keyword if you want to get a new object using that constructor.
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    2. COWow, you are the perfect example of writing Java in JavaScript.
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    3. COYou're missing a `var` on `_arr`, which makes it global.
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