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POsending an object's property as parameter to a function returns undefined
 

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  1. POsending an object's property as parameter to a function returns undefined
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    <p>I am getting myself into javascript/jQuery and therefore am building a Plant vs Zombies. I created an object for the enemies and create a reference for each enemy that shows up with that code: This is the object:</p> <pre><code>var Enemy = function(row, num) { 'use strict'; this.row = row; this.number = num; this.move_interval; this.html_element; }; Enemy.prototype.create = function() { this.html_element = $('&lt;div class="enemy '+this.row+' full" style="left:1140px;top: '+$('tr.row_'+this.row).position().top+'px"&gt;&lt;/div&gt;').prependTo('.container'); return this; }; Enemy.prototype.die = function() { clearInterval(this.move_interval); this.html_element.remove(); return this; }; Enemy.prototype.move = function() { this.move_interval = setInterval(function() {moveEnemy(this.number)}, 2000); return this; }; </code></pre> <p>this is the interval for creating an enemy (i is defined as global variable "var i = 0;"):</p> <pre><code>enemy_interval = setInterval("addEnemy(i++)", 9000)} </code></pre> <p>this is the function to create an Enemy (the random-thingy is because i have four rows on which the enemy could spawn on, thats also what the property row in the object is for):</p> <pre><code>function addEnemy(num) { if (num &lt; 5) { switch (getRandom(1,4)) { case 1: enemies[num] = new Enemy("one", num); enemies[num].create().move(); break; case 2: enemies[num] = new Enemy("two", num) enemies[num].create().move(); break; case 3: enemies[num] = new Enemy("three", num) enemies[num].create().move(); break; case 4: enemies[num] = new Enemy("four", num) enemies[num].create().move(); break; default: break; } } } </code></pre> <p>And here is where the error is showing up:</p> <pre><code>function moveEnemy(number) { enemies[number].html_element.animate({left: "-=150"}, 2000, "linear"); } </code></pre> <p>I have tried several ways by editing the moveEnemy function to get the property "html_element" as parameter and doing it that way:</p> <pre><code>function moveEnemy(obj) { obj.animate({left: "-=150"}, 2000, "linear"); } </code></pre> <p>I have tried to write it like enemies[number][html_element] because i read thats actually the way to get a property but it didn't work as well. It is always telling me that the parameter ('obj' or as above 'number' is undefined). </p> <p>Is anyone able to see that mistake? D:</p>
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