我一直在使用压缩.js https://github.com/fieldchat/client-compress用于单个图像上传。但是,现在我想用它来上传多个图像。
我想要实现的是从 html 输入元素中选择多个图像,然后使用该库对其进行压缩,并在动态生成的标签中预览这些压缩图像。
像这样:-
<img id="preview0">
<img id="preview1">
<img id="preview2">
....取决于所选图像的数量。
这就是我使用它来上传单个图像的方式
<input type="file" accept="image/*" id="image">
<img id="preview">
const options = {
targetSize: 0.2,
quality: 0.75,
maxWidth: 800,
maxHeight: 600
}
const compress = new Compress(options)
const upload = document.getElementById("image")
upload.addEventListener(
"change",
(evt) => {
const files = [...evt.target.files]
compress.compress(files).then((conversions) => {
// Conversions is an array of objects like { photo, info }.
// 'photo' has the photo data while 'info' contains metadata
// about that particular image compression (e.g. time taken).
const { photo, info } = conversions[0]
console.log({ photo, info })
// was using this to append to the form data
newblob = photo.data;
// Create an object URL which points to the photo Blob data
const objectUrl = URL.createObjectURL(photo.data)
// Set the preview img src to the object URL and wait for it to load
Compress.loadImageElement(preview, objectUrl).then(() => {
// Revoke the object URL to free up memory
URL.revokeObjectURL(objectUrl)
})
})
},
false
)
过去两天我一直在努力实现它。
我尝试在 for 循环中运行它
<input type="file" accept="image/*" multiple id="image">
<div id="" class="col previewdiv"></div>
$(function() {
var imgPreviewUpld = function(input, divId) {
if (input.files) {
var numberOfImages = input.files.length;
for (i = 0; i < numberOfImages; i++) {
$($.parseHTML('<img>')).attr({id : "preview"+i, class:"img-fluid"}).css({"max-height":"200px","max-width":"300px"}).appendTo(divId);
const options = {
targetSize: 0.2,
quality: 0.75,
maxWidth: 800,
maxHeight: 600
}
const compress = new Compress(options)
const files = [...input.files]
// const files = [evt.files];
compress.compress(files).then((conversions) => {
// Conversions is an array of objects like { photo, info }.
// 'photo' has the photo data while 'info' contains metadata
// about that particular image compression (e.g. time taken).
const { photo, info } = conversions[0]
console.log({ photo, info })
//to append to the form data
newblob+i = photo.data;
// Create an object URL which points to the photo Blob data
const objectUrl = URL.createObjectURL(photo.data)
// Set the preview img src to the object URL and wait for it to load
Compress.loadImageElement(preview+i, objectUrl).then(() => {
// Revoke the object URL to free up memory
// URL.revokeObjectURL(objectUrl)
})
})
}
}
};
$('#image').on('change', function(evt) {
imgPreviewUpld(this, 'div.previewdiv');
});
});
请大家帮助我。我是 javascript 世界的初学者,但我想为我自己的项目之一做到这一点。
谢谢