Pushing a multiple-attributed item to an array JAVASCRIPT

Question

I have an array set out like this:

var newCircles = [{
    num: 0,
    name: "title0",
    x: 280,
    y: 200,
    color: "#555555",
    r: 60
},
{
    num: 1,
    name: "title1",
    x: 480,
    y: 200,
    color: "#555555",
    r: 80
}];

And I'm trying to push new set of information like this:

$(newCircles).push(', { num: "'+newCircles.length+'", name : "title "'+(newCircles.length)+'", x : "'+newCircles[chosenCircle].x+'", y : "'+newCircles[chosenCircle].y+'", color : "#7f38a7", r : "'+newCircles[chosenCircle].r+'" }');

But it's not working. Anyone have any suggestions?

Answer 1

you are pushing a string into the array. if you want to push another object into the array, then do so by

newCircles.push( {
  num: newCircles.length,
  name: 'title ' + newCircles.length,
  x: newCircles[chosenCircle].x,
  y: newCircles[chosenCircle].y,
  color : "#7f38a7",
  r: newCircles[chosenCircle].r
} );

Answer 2

You're using a string, but what you want to use is an object initializer (frequently called an object literal), just like you did when you initialized your array:

newCircles.push({
    num:   newCircles.length,                // Or you more likely want `newCircles.length + 1`
    name:  "title " + (newCircles.length),   // Again, probably +1
    x:     newCircles[chosenCircle].x,
    y:     newCircles[chosenCircle].y,
    color: "#7f38a7",
    r:     newCircles[chosenCircle].r
});

(There's also no reason for passing it through $().)

As when you initialized your array, the tokens to the left of the : are the property names, and the value of the expressions on the right will be assigned as those properties' values.