Created
June 10, 2024 18:58
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Image download progress with XHR
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| <progress id='imageProgress' value='0' max='100'></progress> | |
| <img id='myImage' src=''/> | |
| <script> | |
| function GetImageLoader(){ | |
| let imageLoader = {}; | |
| imageLoader['LoadImage'] = function(imageUrl, progressUpdateCallback){ | |
| return new Promise((resolve, reject) => { | |
| var xhr = new XMLHttpRequest(); | |
| xhr.open('GET', imageUrl, true); | |
| xhr.responseType = 'arraybuffer'; | |
| xhr.onprogress = function(e){ | |
| if(e.lengthComputable){ | |
| progressUpdateCallback(parseInt((e.loaded / e.total) * 100)); | |
| } | |
| }; | |
| xhr.onloadend = function(){ | |
| progressUpdateCallback(100); | |
| var options = {}; | |
| var headers = xhr.getAllResponseHeaders(); | |
| var typeMatch = headers.match(/^Content-Type\:\s*(.*?)$/mi); | |
| if(typeMatch && typeMatch[1]){ | |
| options.type = typeMatch[1]; | |
| } | |
| var blob = new Blob([this.response], options); | |
| resolve(window.URL.createObjectURL(blob)); | |
| } | |
| xhr.send(); | |
| }); | |
| } | |
| return imageLoader; | |
| } | |
| let myImage = document.getElementById('myImage'); | |
| let imageProgress = document.getElementById('imageProgress'); | |
| let imageLoader = GetImageLoader(); | |
| function updateProgress(progress){ | |
| imageProgress.value = progress; | |
| } | |
| imageLoader.LoadImage('image.jpg', updateProgress) | |
| .then(image => { | |
| myImage.src = image; | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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