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How to call a method from a constructor

I was looking for a question like mine, but it didn't help much because everyone seems to be asking (and answering) something more advanced than my request (I'm at the lowest level of JavaScript knowledge / skill).

Here is my code:

function xyPoint(x, y){
    this.x = x;
    this.y = y;
    this.debugMessage = function(){
        document.getElementById("messageArea").innerHTML =
                "xyPoint(x, y) constructor called";
    };
}

I want my informative message to be automatically printed when I do

var myPoint = new xyPoint(10, 20);

I don't want to execute two statements:

var myPoint = new xyPoint(10, 20);
myPoint.debugMessage();

Any help is appreciated. Thank.

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2 answers


Just call debugMessage in the constructor:



function xyPoint(x, y){
    this.x = x;
    this.y = y;
    this.debugMessage = function(){
        document.getElementById("messageArea").innerHTML =
                "xyPoint(x, y) constructor called";
    };
    this.debugMessage();
}
+2




You can do it like: var myPoint = new xyPoint(10, 20).debugMessage();



JSFiddle

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