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VisualizaçõesHow to remove local storage in javascript
I am studying JavaScript and have been stuck on this for weeks! I need to remove these for items from local Storage. But using localStorage.removeItem('diary'); Will not work.
// Make a demo text item
data =
"Friday: We arrived to this wonderful guesthouse after a pleasant journey " +
"and were made most welcome by the proprietor, Mike. Looking forward to " +
"exploring the area tomorrow.";
item = makeDiaryItem("text", data);
// Make a key using a fixed timestamp
key = "diary" + "1536771000001";
// Store the item in local storage
localStorage.setItem(key, item);
// Make a demo text item
data =
"Saturday: After a super breakfast, we took advantage of one of the many " +
"signed walks nearby. For some of the journey this followed the path of a " +
"stream to a charming village.";
item = makeDiaryItem("text", data);
// Make a key using a fixed timestamp
key = "diary" + "1536771000002";
// Store the item in local storage
localStorage.setItem(key, item);`
Can someone point me in the right direction? Not looking for a direct answer.
3 Respostas
Responde à pergunta0
You need to specify correct keyname that you want to remove from the Local Storage.
In your code, you are setting the item in the Local Storage with the keyname "diary1536771000002". BUT, you are trying to remove the item with keyname "diary".
Try this instead:
localStorage.removeItem('diary1536771000002');
0
You should remove item with the correct key. In your case, the key would be the combination between diary and timestamp
It's possibly like this (because I'm seeing you're using that combination with key variable)
localStorage.removeItem(key);
If it does not work, you can inspect your browser to see the proper key of your local storage (right click on your page and select Inspect and after that you can look for Application tab)
0
If you want to remove all local storage items that begin with a prefix (e.g. "diary"), you could use a function like this:
function removeLocalStorageItems (matcher) {
const keys = [];
for (let i = 0; i < localStorage.length; i += 1) {
const key = localStorage.key(i);
if (key) keys.push(key);
}
const shouldRemove = typeof matcher === 'function' ? matcher : (str) => matcher.test(str);
for (const key of keys) {
if (shouldRemove(key)) localStorage.removeItem(key);
}
}
function removeLocalStorageItemsByPrefix (prefix) {
removeLocalStorageItems(key => key.startsWith(prefix));
}
// Use:
removeLocalStorageItemsByPrefix('diary');
// or
removeLocalStorageItems(/^diary/);