带有持续时间和百分比的进度条

Question

I want to create a progress bar that has a duration ( the time that it takes to finish the animation) and a percentage.

So I want this progress bar to take 3000ms to finish ( to get to 100%):

So far :

  <div id="box"></div>

  <script>
     function start(){
          var duration = 5000; // it should finish in 5 seconds !
         var max = 100;
         var i = 0 ;
         var interval = setInterval(function(){
            i++;
            offset  = (max*i)/duration;
            console.log(offset);
            $("#box").css("width", offset + "px");
            $("#box").text(parseInt(offset) + "%");
            if(i>=duration){
                alert("done "+i);
                clearInterval(interval);
            }
        }, 1);


      }
  </script>

It works but it takes way longer that 5000ms .

I've also added Jquery tag because I don't care if I do this with javascript or jquery

Thanks guys.

Answer 1

Feel free to tweak the below as needed, but the main problems are fixed. Namely, your interval shouldn't be running every 1 millisecond, and it should complete at 100%. The below will set your interval to always run at each 1%.

function start(){
     var duration = 5000; // it should finish in 5 seconds !
     var percent = duration / 100; // 1 percent of duration
     var i = 0 ;
     var interval = setInterval(function(){
        i++;
        $("#box").css("width", i + "px");
        $("#box").text(i + "%");
        if(i>=100){
            alert("done");
            clearInterval(interval);
        }
    }, percent);


}

Answer 2

The simplest solution could be is ot use jQuery's .animate()

 function start() { var duration = 5000; // it should finish in 5 seconds ! $("#box").stop().css("width", 0).animate({ width: 100 }, { duration: duration, progress: function(promise, progress, ms) { $(this).text(Math.round(progress * 100) + '%'); } }); } start()

 #box { border: 1px solid red; }

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <div id="box"></div>

another solution will be is to look at the time difference

 function start() { var duration = 5000; // it should finish in 5 seconds ! var st = new Date().getTime(); var interval = setInterval(function() { var diff = Math.round(new Date().getTime() - st), val = Math.round(diff / duration * 100); val = val > 100 ? 100 : val; $("#box").css("width", val + "px"); $("#box").text(val + "%"); if (diff >= duration) { clearInterval(interval); } }, 100); } start()

 #box { border: 1px solid red; }

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <div id="box"></div>

---

Same using requestAnimationFrame

 function start() { var duration = 5000; // it should finish in 5 seconds ! var st = window.performance.now(); window.requestAnimationFrame(function step(time) { var diff = Math.round(time - st), val = Math.round(diff / duration * 100); val = val > 100 ? 100 : val; $("#box").css("width", val + "px"); $("#box").text(val + "%"); if (diff < duration) { window.requestAnimationFrame(step); } }) } start()

 #box { border: 1px solid red; }

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <div id="box"></div>

Answer 3

Not sure if you're using it yet, but you could bootstrap to do this.

<div class="progress-bar" style="width: 0;" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100" >


var value = 0;

function start(){
    value += 5;
    $( ".progress-bar" ).css("width", value+"%").attr("aria-valuenow", value);    
    if ( value%5 == 0 ) { 
        return setTimeout(restart, 100); 
    }
    if(value >= 100)
        return;
    else
        setTimeout(restart, 50);
}

function restart() {
    start();
}

Answer 4

I used the answer provided by some of you but you got one thing wrong on the progress bar. You need to change the "px" in jquery to be "%" otherwise the progress bar will only be 100px wide. Since I am using the Bootstrap Progress bar the values here amend to what is already there and fill up the progress wrapper as the page loads.

 function start() {
 var duration = 5000; // it should finish in 5 seconds !
 var st = window.performance.now();
 window.requestAnimationFrame(function step(time) {
 var diff = Math.round(time - st),
 val = Math.round(diff / duration * 100);
 val = val > 100 ? 100 : val;
 $(".progress-bar").css("width", val + "%");
 $(".progress-bar").text(val + "%");
 if (diff < duration) {
   window.requestAnimationFrame(step);
   }
 })
}
start()