Utilisez principalement le canevas HTML5 pour compresser l'image, puis convertissez-la en dataURL, puis convertissez la dataURL en un fichier Blob. L'objet Blob peut être directement affecté à Formdata.
app.service('Util', function($q) { var dataURItoBlob = function(dataURI) { // convert base64/URLEncoded data component to raw binary data held in a string var byteString; if (dataURI.split(',')[0].indexOf('base64') >= 0) byteString = atob(dataURI.split(',')[1]); else byteString = unescape(dataURI.split(',')[1]); // separate out the mime component var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]; // write the bytes of the string to a typed array var ia = new Uint8Array(byteString.length); for (var i = 0; i < byteString.length; i++) { ia[i] = byteString.charCodeAt(i); } return new Blob([ia], { type: mimeString }); }; var resizeFile = function(file) { var deferred = $q.defer(); var img = document.createElement("img"); try { var reader = new FileReader(); reader.onload = function(e) { img.src = e.target.result; //resize the image using canvas var canvas = document.createElement("canvas"); var ctx = canvas.getContext("2d"); ctx.drawImage(img, 0, 0); var MAX_WIDTH = 800; var MAX_HEIGHT = 800; var width = img.width; var height = img.height; if (width > height) { if (width > MAX_WIDTH) { height *= MAX_WIDTH / width; width = MAX_WIDTH; } } else { if (height > MAX_HEIGHT) { width *= MAX_HEIGHT / height; height = MAX_HEIGHT; } } canvas.width = width; canvas.height = height; var ctx = canvas.getContext("2d"); ctx.drawImage(img, 0, 0, width, height); //change the dataUrl to blob data for uploading to server var dataURL = canvas.toDataURL('image/jpeg'); var blob = dataURItoBlob(dataURL); deferred.resolve(blob); }; reader.readAsDataURL(file); } catch (e) { deferred.resolve(e); } return deferred.promise; }; return { resizeFile: resizeFile }; });
Étant donné qu'angualrjs ne prend actuellement pas en charge le téléchargement de fichiers via des données multiformes, vous pouvez utiliser le code suivant pour télécharger des fichiers dans formdata
app.controller('CompanyCtrl', function($http, Util) { Util.resizeFile(input.files[0]).then(function(blob_data) { var fd = new FormData(); fd.append("imageFile", blob_data); $http.post('http://your.domain.com/upload', fd, { headers: {'Content-Type': undefined }, transformRequest: angular.identity }) .success(function(data) { $scope.model.company_pict = data[0]; }) .error(function() { console.log("uploaded error...") }); }, function(err_reason) { console.log(err_reason); }); }