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I'm working on an app that will present surveys to the user. The markup looks something like this:
<body> <div class="question" id="q1"> Question 1 </div> <div class="question" id="q2"> Question 2 </div> <!-- etc --> </body> I want to construct the JavaScript objects from the DOM using jQuery, so in the Survey constructor I'm traversing the jQuery set using the each() method. The problem is that within the callback function I'm unable to get a reference to the Survey object in order to append each Question object to the Survey.questions array. How can get a reference to the Survey object? Is there a way to pass an additional parameter (e.g. a reference to the Survey object) to the callback function?
function Survey() { this.questions = new Array; $('.question').each(function(i) { (/* Survey object */).questions.push(new Question(this)); }); } function Question(element) { this.element = $(element); } 
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You should be able to create a reference to your survey before you iterate over the questions.
function Survey() { this.questions = new Array(); var survey = this; $('.question').each(function(i) { survey.questions.push(new Question(this)); }); } function Question(element) { this.element = $(element); } var survey = new Survey(); $.each(survey.questions, function() { $("ul").append("<li>" + this.element.text() + "</li>"); }); Working example on jsfiddle
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