Is there a way in JS to get the progress of a loading image while the image is being loaded? I want to use the new Progress tag of HTML5 to show the progress of loading images.
I wish there was something like:
var someImage = new Image()
someImage.onloadprogress = function(e) { progressBar.value = e.loaded / e.total };
someImage.src = "image.jpg";
With this, you add 2 new functions on the Image() object:
Image.prototype.load = function(url){
var thisImg = this;
var xmlHTTP = new XMLHttpRequest();
xmlHTTP.open('GET', url,true);
xmlHTTP.responseType = 'arraybuffer';
xmlHTTP.onload = function(e) {
var blob = new Blob([this.response]);
thisImg.src = window.URL.createObjectURL(blob);
};
xmlHTTP.onprogress = function(e) {
thisImg.completedPercentage = parseInt((e.loaded / e.total) * 100);
};
xmlHTTP.onloadstart = function() {
thisImg.completedPercentage = 0;
};
xmlHTTP.send();
};
Image.prototype.completedPercentage = 0;
And here you use the load function and append the image on a div.
var img = new Image();
img.load("url");
document.getElementById("myDiv").appendChild(img);
During the loading state you can check the progress percentage using img.completedPercentage
.