Change setInterval value dynamically

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心在旅途
心在旅途 2021-02-04 11:01

I want to change interval value of setInterval dynamically. I\'m struggling due to presence of a loop in setInterval callback function. I have seen too many questions on stackov

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  •  醉梦人生
    2021-02-04 11:44

    This is a version without setInterval i always use:

    function timer()
    {
        var timer = {
            running: false,
            iv: 5000,
            timeout: false,
            cb : function(){},
            start : function(cb,iv,sd){
                var elm = this;
                clearInterval(this.timeout);
                this.running = true;
                if(cb) this.cb = cb;
                if(iv) this.iv = iv;
                if(sd) elm.execute(elm);
                this.timeout = setTimeout(function(){elm.execute(elm)}, this.iv);
            },
            execute : function(e){
                if(!e.running) return false;
                e.cb();
                e.start();
            },
            stop : function(){
                this.running = false;
            },
            set_interval : function(iv){
                clearInterval(this.timeout);
                this.start(false, iv);
            }
        };
        return timer;
    }
    

    Usage:

    var timer_1 = new timer();
    timer_1.start(function(){
        //magic here
    }, 2000, false);
    
    var timer_2 = new timer();
    timer_2.start(function(){
        //more magic here
    }, 3000, true);
    
    //change the interval
    timer_2.set_interval(4000);
    
    //stop the timer
    timer_1.stop();
    

    The last parameter of the start function is a boolean if the function needs to be run at 0.

    You can also find the script here: https://github.com/Atticweb/smart-interval

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