ReactJS how to persist state in cookies [closed] - javascript

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Below is sample example for counter but i have to maintain the state after page is refree.For example i will increment the counter to 10 and next time when my page refreshes the page should start with 10 instead of 1.
Can anyhow guide me regarding this.

If you want to use cookies JS-cookie is really handy. Setting and retrieving cookie is really easy.

Use localStorage for that.
In your action handler do:
let counter = window.localStorage.getItem("counter");
window.localStorage.setItem("counter ", ++counter);
Then in your componentDidMount do:
let counter = window.localStorage.getItem("counter");
this.setState("counter", counter);

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How to resolve lazy loading issue in React [closed]

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I test my app and found out when I create a multiple pages the page state take time 3 to 4 sec also if I am double click page state is gone.
I try to disable unnecessary apis to get a better loading experience.

How to update value in realtime database in Firebase using JS [closed]

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Closed 4 years ago.
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This is what my database looks like:
My question is how to I decrement the value of FIELD11 i.e. "4" in my realtime database in Firebase using javascript, everytime I click on DECREMENT Button on my html page it should decrement this value and get updated in realtime database. Thank You
I recommend you use a Firebase transaction.
When working with data that could be corrupted by concurrent modifications, such as incremental counters, you can use a transaction operation.
Example:
https://firebase.google.com/docs/database/web/read-and-write#save_data_as_transactions

Highscore variable not working on game [closed]

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Closed 6 years ago.
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I am currently developing a game using Phaser, and trying to implement a system to save the highscore from the current score. It isn't working for some reason and I don't know why, it seems to not be changing the highscore variable based on the current score.
I have put the simple game on Jsfiddle with the code here: https://jsfiddle.net/zpy8wLqf/
This is what I tried for the highscore variable.
highscore=0;
var currentscore;
if(this.currentscore>highscore){
highscore =this.currentscore;
}
The textures are not there, but that shouldn't be a problem.
thats because your check only runs on state start, try putting the check inside the reset
reset: function() {
if(this.currentscore>highscore){
highscore =this.currentscore;
}
// Start the 'main' state, which restarts the game
begin.state.start('adventure');
}

Keeping Score of quiz in javascript website [closed]

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We are creating a website in which homework (with about 10 multiple choice questions) will be graded. Each question is on their own HTML page. How do we tally the overall grade of the homework, while keeping track of each multiple choice question? (Deduct .33 points twice if wrong, then tally that score to a total score for the homework)
You need to have some state to persist the answers. There are a number of options including:
save the answer to the server for each question
save the answer to localStorage
save the answer in a cookie
save the answer in the URL as a query parameter
If you prefer to stay client side, I suggest using localStorage. It is a key-value store with some limitations on size but it should be a good fit for your problem.
My approach would be to store the answer into localStorage for each question. On the final page, I would load all the answers and perform the calculation for points.
MDN: localStorage

Don't understand how Google's infinite load example works [closed]

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Closed 8 years ago.
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Would anyone be willing to explain how the following example works?
http://scrollsample.appspot.com/items
I don't understand how the URL gets updated (changes from /items?page=2 to /items?page=3)
I also do not understand how the rel tags get updated either (prev/next/canonical)
Thanks for any help you can provide.
Check out http://scrollsample.appspot.com/static/main.js
and look for the initPaginator function. There's a call to history.replaceState.
history.replaceState allows you to update the address bar without a page change.

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