[英]Dynamically uploading images in HTML and Javascript
如何使用HTML和Javascript上傳多個單獨的圖像? 我擁有的代碼基於此https://developer.mozilla.org/zh-CN/docs/Web/API/FileReader.readAsDataURL,但我想選擇創建多個上傳按鈕,並且每個上傳按鈕應上傳一個圖像獨立於其他按鈕。 這是我的代碼:
<!DOCTYPE html>
<a class="btn btn-default" href="#" role="button" onclick = "addEntry()" >Add</a>
<script>
function addEntry() {
var browse = document.createElement("INPUT");
browse.setAttribute("type", "file");
picture = document.createElement("img");
picture.src = "";
picture.setAttribute("alt", "No image chosen");
picture.setAttribute("height","100");
browse.setAttribute("onchange", "previewFile(picture)");
document.body.appendChild(browse);
document.body.appendChild(picture);
}
function previewFile(inPic){
var preview = document.querySelector('img');
var file = document.querySelector('input[type=file]').files[0];
var reader = new FileReader();
reader.onloadend = function () {
preview.src = reader.result;
}
if (file) {
reader.readAsDataURL(file);
} else {
preview.src = "";
}
}
無需使用文件閱讀器。
從那里的代碼片段:
var formData = new FormData();
formData.append("username", "Groucho");
formData.append("accountnum", 123456); // number 123456 is immediately converted to string "123456"
// HTML file input user's choice...
formData.append("userfile", fileInputElement.files[0]);
// JavaScript file-like object...
var content = '<a id="a"><b id="b">hey!</b></a>'; // the body of the new file...
var blob = new Blob([content], { type: "text/xml"});
formData.append("webmasterfile", blob);
var request = new XMLHttpRequest();
request.open("POST", "http://foo.com/submitform.php");
request.send(formData);
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