Dropzone.js调整图像大小以适合缩略图大小

Question

我正在尝试调整缩略图中的图像大小以修复框大小.我试过这个:

Dropzone.options.myAwesomeDropzone = {
            maxFiles: 20,
            maxFilesize: 2,
            maxThumbnailFilesize: 20,
            acceptedFiles: 'image/*,.jpg,.png,.jpeg',
            thumbnailWidth:"250",
            thumbnailHeight:"250",
            init: function() {
                var dropzone = this, xhrs = [];
                $.each(uploadedImages, function (index, path) {
                    var xhr = new XMLHttpRequest();
                    xhr.open('GET', path);
                    xhr.responseType = 'blob';//force the HTTP response, response-type header to be blob
                    xhr.onload = function() {
                        var file = new File([xhr.response], '', {'type': xhr.response.type});
                        //dropzone.addUploadedFile(file);
                        dropzone.emit("addedfile", file);
                        dropzone.emit("thumbnail", file, path);
                        dropzone.emit("complete", file);
                    };
                    xhrs.push(xhr);
                    xhr.send();
                });
                this.options.maxFiles = this.options.maxFiles - uploadedImages.count;
            }
        };

这是原始图像的外观:http: //files.parsetfss.com/12917a88-ac80-4e5e-a009-fc634161b79c/tfss-6c59b59f-8f57-4610-966e-31bbc203707b-samsung-galaxy-note-4-7290 -002.jpg

这就是它的显示方式:

我也尝试过:

thumbnailWidth:"300",
thumbnailHeight:"300",
===
thumbnailWidth:"400",
thumbnailHeight:"400",

但没有改变,thumbnailWidth and thumbnailHeight没有任何效果

Answer 1

我有同样的问题,但是如果你手动调用dropzone的resize函数,那么thumnails将是正确的尺寸:

var file = new File([xhr.response], '', {'type': xhr.response.type});
dropzone.createThumbnailFromUrl(file,path);
dropzone.emit("addedfile", file);
dropzone.emit("thumbnail", file, path);
dropzone.emit("complete", file);

Answer 2

您可以在 JavaScript 中明确调整新图像的大小。

var img = new Image();
img.src =  'http://files.parsetfss.com/12917a88-ac80-4e5e-a009-fc634161b79c/tfss-6c59b59f-8f57-4610-966e-31bbc203707b-samsung-galaxy-note-4-7290-002.jpg';
img.height = 300;
img.width = 300;

img现在已调整为适当的尺寸。

另外，我刚刚查看了 dropzone.js 文档，这个方法可能有用。http://www.dropzonejs.com/#config-resize