Automated Async Saving in Angular 2 using Typescript

Question

Automated Async Saving in Angular 2 using Typescript

I am currently working on implementing an autosave feature in TypeScript. The main objective is to automatically save any text input by the user every 10 seconds to prevent loss of data in case of a page crash or accidental closure. I aim to initiate the autosave functionality immediately after the page has fully loaded.

Here is a snippet of the code I have written:

ngAfterViewInit() {
    this.autoSaveContent();
}

private  autoSaveContent() {
    while (true) {
        if (this.isSaving == false && this.hasContentChanged() == true) {
            this.content.status = 1;
            setTimeout(this.saveContent(), 10000)
        }
    }

}

I am seeking advice on how to execute the code asynchronously. My intention is for this process to run continuously as soon as the page is accessed, ensuring that the content is consistently saved.

angular typescript asynchronous

Answer 1

Answer №1

Every 10 seconds, setInterval() function will be checking for any changes to the content...

ngAfterViewInit() {
    this.autoSaveContent();
}

private  autoSaveContent() {
    var that = this;
    setInterval(function() {
        if (that.isSaving == false && that.hasContentChanged() == true) {
            that.saveContent();
        }
    }, 10000);
}

When using ES6, you can opt for fat arrow syntax which avoids the need to capture "this" in the closure:

private  autoSaveContent() {
    setInterval(() => {
        if (this.isSaving == false && this.hasContentChanged() == true) {
            this.saveContent();
        }
    }, 10000);
}

Answer 2

Every 10 seconds, setInterval() function will be checking for any changes to the content...

ngAfterViewInit() {
    this.autoSaveContent();
}

private  autoSaveContent() {
    var that = this;
    setInterval(function() {
        if (that.isSaving == false && that.hasContentChanged() == true) {
            that.saveContent();
        }
    }, 10000);
}

When using ES6, you can opt for fat arrow syntax which avoids the need to capture "this" in the closure:

private  autoSaveContent() {
    setInterval(() => {
        if (this.isSaving == false && this.hasContentChanged() == true) {
            this.saveContent();
        }
    }, 10000);
}

Answer 3

Answer №2

It seems like the solution provided should do the trick! The only issue I notice is that you should pass a function reference in the `setTimeout` method instead of directly calling it there.

setTimeout(this.saveContent.bind(this), 10000)

OR

setTimeout(() => { this.saveContent() }, 10000)

Answer 4

It seems like the solution provided should do the trick! The only issue I notice is that you should pass a function reference in the `setTimeout` method instead of directly calling it there.

setTimeout(this.saveContent.bind(this), 10000)

OR

setTimeout(() => { this.saveContent() }, 10000)

Answer 5

Answer №3

Thank you for your feedback, I recently discovered that there is a handy timer feature in Observable. By utilizing this timer, I was able to address the issue efficiently.

ngAfterViewInit() {
    this.isPageActive = true;
    let timer = Observable.timer(10000, 10000);
    let subscription = timer.subscribe(x => this.autoSaveContent());
}

private autoSaveContent() {
    if (this.isSaving == false && this.hasContentChanged() == true) {
        this.content.status = 1;
        this.saveContent();
    }

}

Answer 6

Thank you for your feedback, I recently discovered that there is a handy timer feature in Observable. By utilizing this timer, I was able to address the issue efficiently.

ngAfterViewInit() {
    this.isPageActive = true;
    let timer = Observable.timer(10000, 10000);
    let subscription = timer.subscribe(x => this.autoSaveContent());
}

private autoSaveContent() {
    if (this.isSaving == false && this.hasContentChanged() == true) {
        this.content.status = 1;
        this.saveContent();
    }

}

Automated Async Saving in Angular 2 using Typescript

Answer №1

Answer №2

Answer №3

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