How can i remove any item from json data?

Question

my below code is not working. i wanna remove any item from my json . i could not achieve that.

How can i remove any item from my json ?

  var Messages = {};
Messages.data = [{
    id: "1",
    message: "Message 1"
}, {
    id: "2",
    message: "Message 2"
}, {
    id: "3",
    message: "Message 3"
}, {
    id: "4",
    message: "Message 4"
}];

deleteItem("Message 3");
console.log(Messages.data);
function deleteItem(index) {
    var i=0;
    for(var prop in Messages.data){
       if(index===Messages.data[i].message){
         Messages.data.splice(Messages.data[i], i);
      }

      i++;
    }

}

That's a JavaScript object, not JSON, and your for loop is ... weird. What about using a classic for? — Pablo Lozano, Aug 27 '15 at 13:27

score 4 · Accepted Answer · answered Aug 27 '15 at 13:30

Try this:

var Messages={};
Messages.data=[{
    id: "1",
    message: "Message 1"
}, {
    id: "2",
    message: "Message 2"
}, {
    id: "3",
    message: "Message 3"
}, {
    id: "4",
    message: "Message 4"
}];
function deleteItem(index){
    for(var i=0, len=Messages.data.length; i < len; i++){
        console.log(Messages.data[i]);
        if(index===Messages.data[i].message){
            Messages.data.splice(i, 1);
            break;
        }
    }
}
deleteItem("Message 3");
console.log(Messages.data);

You need to break the loop as once we splice the element, length of array gets reduced by 1

score 1 · Answer 2 · answered Aug 27 '15 at 13:31

This line is incorrect:

Messages.data.splice(Messages.data[i], i);

The first argument to splice should be the index of the array where you want to start deleting, and the 2nd argument is the number of items to delete. Therefore, your code should be

Messages.data.splice(i, 1);

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

How can i remove any item from json data?

2 Answers2