Question

44

JavaScript creating new instance of objects

rated 0 times [ 45] [ 1] / answers: 1 / hits: 101531 / 11 Years ago, tue, march 19, 2013, 12:00:00

So I am designing a grade book interface and I have a course defined as:

<script>

course = new Object();

 var name;

 var gradingareas;

 var finalgrade;

</script>

then later I want to create a new instance:

 var gradingareas = new Array(Homework, Classwork, Exams);



 course1 = new course(CS1500, gradingareas, 85);

I have also tried without the var in front to no avail. I get an Uncaught TypeError: Object is not a function I am very new to javascript so I don't even know if Im going about this the correct way. Any help is appreciated Thanks.

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bryantc

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answered 11 Years ago talonb · Accepted Answer

Your existing code:

// Creates a new, empty object, as a global

course = new Object();

// Creates three new variables in the global scope.

var name;

var gradingareas;

var finalgrade;

There is no connection between the variables and the object.

It looks like you want something more like:

function Course(name, gradingareas, finalgrade) {

    this.name = name;

    this.gradingareas = gradingareas;

    this.finalgrade = finalgrade;

}

Then:

var course1 = new Course(CS1500, gradingareas, 85);

Note the use of a capital letter for naming the constructor function. This is a convention in the JS community.