CODEWITHSUNDEEP
javascriptfunction
sambit
sambit

Reputation: 266

Functions to run after previous function is fully executed

I am new to react and I am stuck in this. I am calling functions in a function like so:

submit = () => {
    this.props.getValue();
    this.props.resetValidation();
    this.notify();
    this.props.toggle();
    this.props.disable();
    this.props.actionCost();

    //this.props.action();
    // this.props.actionTable();
  };

What is happening is that all the functions are running simultaneously without a function getting fully executed. Why is this happening shouldnt a function be called only after first function runs successfully?

Also how do I run the functions one after the other after a function is fully executed?

Please help

Upvotes: 1

Views: 2879

Answers (1)

gilamran
gilamran

Reputation: 7304

The only way to stop the execution flow, is by using async/await or a generoator function, and even these are only "syntactic sugar" on top of Promise.

You are probably calling an asynchronous function, and expecting it to "complete" without using await.

Another situation is calling a function that internally using asynchronous calls (Like axios or fetch), and reply back with callbacks. In this situation the execution continues, and the callback will be called later, that's way we call them "callback"

For example:

console.log('before');
setTimeout(() => console.log('timer completed'), 1000);
console.log('after');

Will result in:

before
after
timer completed

In this example I'm logging before, then setting a timeout where I'm providing a callback (a simple function) that will be executed later (1 sec.), meanwhile the execution flow continues, and logs after. once the timer reached the system will execute my callback.

In case that you want to execute the after after the timer completed, you will have to provide a callback that will be called after the execution is done.

like this:

function logTimer(doAfter) {
  setTimeout(() => {
    console.log('timer completed');
    doAfter();
   }, 1000);
}

console.log('before');
logTimer(() => console.log('after'));

Upvotes: 1

Related Questions