CODEWITHSUNDEEP
javascriptlocal-storage
ddon
ddon

Reputation: 205

(javascript) local storage value update

I set the data to a key called 'todo' in Local Storage.

The structure is like this.

key: todo
value : [{"text":"sdf","idx":1,"curTime":"Sun Dec 22 2019","finYN":""}]

when a button is clicked, I want to update to "Y" when finYN is empty or "N".

If this is my current local storage structure I can use this code but I don't know what to do with the current structure.

key: text / value : "sdf"
key: idx / value : 1
key: finYN / value : "Y"

localStorage.setItem("finYN", JSON.stringify ("Y"));

Upvotes: 1

Views: 151

Answers (2)

Jay Surya
Jay Surya

Reputation: 570

Localstorage values are plain strings, so you cannot manipulate stringified objects. You will have to replace the whole value. 

var todos = JSON.parse(localStorage.getItem('todo'));
if(!todos[0]['finYN']){
  todo['finYN'] = 'Y';
  localStorage.setItem('todo',JSON.stringify(todos))
}

Upvotes: 1

Marcin
Marcin

Reputation: 1494

If you save the values as a string:

localStorage.setItem('todo', JSON.stringify({"text":"sdf","idx":1,"curTime":"Sun Dec 22 2019","finYN":""}));

then you can get the value of that localStorage key and turn it back into JSON:

var json = JSON.parse(localStorage.getItem('todo'));

from here you can easily check the value by accessing json.finYN and then changing the JSON and when you are done, you can store it as a string again.

Upvotes: 2

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