Question

I have created an empty json object having an array itemlist(which further contains itemid and title of an item) by this:

var jsonObj = {};
jsonObj.itemlist=[];
jsonObj.itemlist.push({});

Firstly, have i done the declaration correctly?

Secondly, the title and itemid are generated dynamically so i need to add them to the itemlist array. I tried this but it keeps only one array element:

jsonObj.itemlist['title']=gentitle;
jsonObj.itemlist['itemid']=genitemid;

How can i add multiple elements (not all at once) if i have an empty array of itemlists?

Also, i also need to remove a particular array element based on the title of the element. How can that be done? I think the splice and delete function can be used for this, but how can i find the index of that element?

Answer 1

since you already pushed a empty object into the array, you need to modify that object:

jsonObj.itemlist[0]['title']=gentitle;
jsonObj.itemlist[0]['itemid']=genitemid;

To add more objects, you can do the same thing: push in an empty object, then modify that object. Or, you can create an object, modify it, then push it into the list.

var new_obj = {'title':gentitle, 'itemid':genitemid};
jsonObj.itemlist.push( new_obj );

To delete objects with certain attribute value:

for (var i = jsonObj.itemlist.length-1; i >= 0; i--)
    if(jsonObj.itemlist[i]['title'] == "to-be-removed")
        jsonObj.itemlist.splice(i,1);

Note that you need to go backward, otherwise the splice will mess up the array indexes