How can i make so when i click a button it will resolve a promise, and if i click again it will wait-CodePudding

  let msg = "Done";
  function promise() {
    return new Promise((resolve) => {
      setTimeout(() => {
        resolve("Done");
      }, 2000);
    });
  }
  async function func1() {
    msg = "Pending";
    console.log("Starting...");
    const a = await promise();
    console.log(a);
    msg = a;
  }

  async function func2() {
    console.log("Queued");
  }

  async function call() {
    if ((msg) === "Done") {
      func1();
    } else {
      func2();
    }
  }

<h1>PROMISE</h1>
<input onclick="call()" type="button" value="Click me " />

I added this piece of code into func2(), it runs func1() after the previous promise is resolved, but it also runs it immediately after click. How can i do so it only runs after previous promise is resolved.

func2() {
  console.log("Queued");
  await func1();
  func1();
}

EDIT: Guys! I solved this problem using Date().getTime() method, and adding "clicks" variable. The result is almost the same. But the way of doing it is different. When i click its immediately starts executing promise, but i wanted it to wait untill the promise from previous click is finished and only then start executing a new promise. I think there has to be some other simpler solution.

 let msg = "Done";
  let clicks = 0;
  let t1;
  let t2;
  let timeout = 0;
  let txt = "";
  function promise() {
    return new Promise((resolve) => {
      setTimeout(() => {
        resolve("Done");
      }, 2000 * clicks - timeout);
    });
  }
  async function func1() {
    clicks = 1;
    timeout = 0;
    txt = "";
    msg = "Pending";

    let time = new Date();
    t1 = time.getTime();
    const a = await promise();
    let taym = new Date();
    let now = taym.getTime();
    createDiv(now, t1, txt);
    msg = a;
  }

  async function func2() {
    clicks  ;
    let time = new Date();
    t2 = time.getTime();
    timeout = t2 - t1;
    const a = await promise();
    let taym = new Date();
    let now = taym.getTime();
    txt = " and "   (now - t2)   " ms after last click";
    createDiv(now, t1, txt);
  }

  async function call() {
    if (msg === "Done") {
      func1();
    } else {
      func2();
    }
  }

  function createDiv(a, b, c) {
    let div = document.createElement("div");
    div.innerHTML = "Created "   (a - b)   " ms after main click"   c;
    document.body.appendChild(div);
  }

<h1>PROMISE</h1>
<input onclick="call()" type="button" value="Click me " />

CodePudding user response：

Code below does what I think you want

resolving to the event, just to show that the timeStamp shown in the second click is the first click timeStamp, because that's what the promise resolves to in this example

Not sure how useful this code is though

const promise = new Promise(resolve => {
  document.getElementById('bang').addEventListener('click', e => {
    console.log('first click');
    resolve(e);
  }, { once: true });
})
promise.then(e => {
  console.log(e.timeStamp, e.type, e.target.id);
  document.getElementById('bang').addEventListener('click', e => {
    promise.then(e => {
      console.log('not the first click');
      console.log(e.timeStamp, e.type, e.target.id);
    })
  })
})

<button id="bang">Resolve the promise</button>