JQuery多圖檔上傳+預覽
參考自
這是CSS部分代碼
.float{
float:left;
width : 200px;
height: 200px;
overflow: hidden;
border: 1px solid #CCCCCC;
border-radius: 10px;
padding: 5px;
margin: 5px;
}
img{
position: relative;
}
.result{
width: 200px;
height: 200px;
text-align: center;
box-sizing: border-box;
}
#file_input{
/*display: none; */
}
.delete{
width: 200px;
height:200px;
position: absolute;
text-align: center;
line-height: 200px;
z-index: 10;
font-size: 30px;
background-color: rgba(255,255,255,0.8);
color: #777;
opacity: 0;
transition-duration: 0.7s;
-webkit-transition-duration: 0.7s;
}
.delete:hover{
cursor: pointer;
opacity: 1;
}
這是body部分
<div class="container">
<label>圖檔選擇:</label>
<button id="select">更換圖檔</button>
<button id="add">追加圖檔</button>
<input type="file" id="file_input" multiple/> <!--multiple是多選的關鍵-->
<button id="submit">送出</button>
</div>
<div class="get"></div>
這是引入的依賴
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
這是js部分
$(function(){
var input = $("#file_input");
var result;
var dataArr = []; // 儲存所選圖檔的結果(檔案名和base64資料)
var fd; //FormData方式發送請求
var oSelect = $("#select");
var oAdd = $("#add");
var oSubmit = $("#submit");
var oInput = $("#file_input");
if(typeof FileReader==='undefined'){
alert("抱歉,你的浏覽器不支援 FileReader");
input.setAttribute('disabled','disabled');
}else{
$("#file_input").on('change',readFile);
} //handler
function readFile(){
fd = new FormData();
var iLen = this.files.length;
var path=$("#file_input").val();
var extStart =path.lastIndexOf('.');
var ext = path.substring(extStart,path.length).toUpperCase();
for(var i=0;i<iLen;i++){
if (ext !== '.PNG' && ext !== '.JPG' && ext !== '.JPEG' && ext !== '.GIF'){ //判斷上傳檔案格式
return alert("上傳的圖檔格式不正确,請重新選擇");
}
var reader = new FileReader();
fd.append(i,this.files[i]);
reader.readAsDataURL(this.files[i]); //轉成base64
reader.fileName = this.files[i].name;
reader.onload = function(e){
var imgMsg = {
name : this.fileName,//擷取檔案名
base64 : this.result //reader.readAsDataURL方法執行完後,base64資料儲存在reader.result裡
}
dataArr.push(imgMsg);
result = '<div class="delete">删除</div><div class="result"><img class="subPic" src="'+this.result+'" alt="'+this.fileName+'"/></div>';
var div = document.createElement('div');
div.innerHTML = result;
div['className'] = 'float';
$(".get")[0].append(div); //插入dom樹
var img = div.getElementsByTagName('img')[0];
img.onload = function(){
var nowHeight = ReSizePic(this); //設定圖檔大小
this.parentNode.style.display = 'block';
var oParent = this.parentNode;
if(nowHeight){
oParent.style.paddingTop = (oParent.offsetHeight - nowHeight)/2 + 'px';
}
}
div.onclick = function(){
$(this).remove(); // 在頁面中删除該圖檔元素
}
}
}
}
function send(){
var submitArr = [];
$('.subPic').each(function () {
submitArr.push({
name: $(this).attr('alt'),
base64: $(this).attr('src')
});
}
);
$.ajax({
url : 'http://123.206.89.242:9999',
type : 'post',
data : JSON.stringify(submitArr),
dataType: 'json',
//processData: false, 用FormData傳fd時需有這兩項
//contentType: false,
success : function(data){
console.log('傳回的資料:'+JSON.stringify(data))
}
})
}
$("#select").click(function(){
oInput.value = ""; // 先将oInput值清空,否則選擇圖檔與上次相同時change事件不會觸發
//清空已選圖檔
$('.float').remove();
oInput.click();
})
$("#add").click(function(){
oInput.value = ""; // 先将oInput值清空,否則選擇圖檔與上次相同時change事件不會觸發
oInput.click();
})
$("#submit").click(function(){
if(!dataArr.length){
return alert('請先選擇檔案');
}
send();
})
} )
function ReSizePic(ThisPic) {
var RePicWidth = 200; //這裡修改為您想顯示的寬度值
var TrueWidth = ThisPic.width; //圖檔實際寬度
var TrueHeight = ThisPic.height; //圖檔實際高度
if(TrueWidth>TrueHeight){
//寬大于高
var reWidth = RePicWidth;
ThisPic.width = reWidth;
//垂直居中
var nowHeight = TrueHeight * (reWidth/TrueWidth);
return nowHeight; //将圖檔修改後的高度傳回,供垂直居中用
}else{
//寬小于高
var reHeight = RePicWidth;
ThisPic.height = reHeight;
}
}
接下來是全部的代碼
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>showImages</title>
<style type="text/css">
.float{
float:left;
width : 200px;
height: 200px;
overflow: hidden;
border: 1px solid #CCCCCC;
border-radius: 10px;
padding: 5px;
margin: 5px;
}
img{
position: relative;
}
.result{
width: 200px;
height: 200px;
text-align: center;
box-sizing: border-box;
}
#file_input{
/*display: none; */
}
.delete{
width: 200px;
height:200px;
position: absolute;
text-align: center;
line-height: 200px;
z-index: 10;
font-size: 30px;
background-color: rgba(255,255,255,0.8);
color: #777;
opacity: 0;
transition-duration: 0.7s;
-webkit-transition-duration: 0.7s;
}
.delete:hover{
cursor: pointer;
opacity: 1;
}
</style>
</head>
<body>
<div class="container">
<label>添加圖檔:</label>
<button id="select">更新圖檔</button>
<button id="add">繼續添加</button>
<input type="file" id="file_input" multiple/>
<button id="submit">送出</button>
</div>
<div class="get"></div>
</body>
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<script type="text/javascript">
$(function(){
var result;
var dataArr = []; // 儲存所選圖檔的結果(檔案名和base64資料)
var fd; //FormData方式發送請求
var oInput = $("#file_input");
if(typeof FileReader==='undefined'){
alert("抱歉,你的浏覽器不支援 FileReader");
input.setAttribute('disabled','disabled');
}else{
$("#file_input").on('change',readFile);
} //handler
function readFile(){
fd = new FormData();
var iLen = this.files.length;
var path=$("#file_input").val();
var extStart =path.lastIndexOf('.');
var ext = path.substring(extStart,path.length).toUpperCase();
for(var i=0;i<iLen;i++){
if (ext !== '.PNG' && ext !== '.JPG' && ext !== '.JPEG' && ext !== '.GIF'){ //判斷上傳檔案格式
return alert("上傳的圖檔格式不正确,請重新選擇");
}
var reader = new FileReader();
fd.append(i,this.files[i]);
reader.readAsDataURL(this.files[i]); //轉成base64
reader.fileName = this.files[i].name;
reader.onload = function(e){
var imgMsg = {
name : this.fileName,//擷取檔案名
base64 : this.result //reader.readAsDataURL方法執行完後,base64資料儲存在reader.result裡
}
dataArr.push(imgMsg);
result = '<div class="delete">删除</div><div class="result"><img class="subPic" src="'+this.result+'" alt="'+this.fileName+'"/></div>';
var div = document.createElement('div');
div.innerHTML = result;
div['className'] = 'float';
$(".get")[0].append(div); //插入dom樹
var img = div.getElementsByTagName('img')[0];
img.onload = function(){
var nowHeight = ReSizePic(this); //設定圖檔大小
this.parentNode.style.display = 'block';
var oParent = this.parentNode;
if(nowHeight){
oParent.style.paddingTop = (oParent.offsetHeight - nowHeight)/2 + 'px';
}
}
div.onclick = function(){
$(this).remove(); // 在頁面中删除該圖檔元素
}
}
}
}
function send(){
var submitArr = [];
$('.subPic').each(function () {
submitArr.push({
name: $(this).attr('alt'),
base64: $(this).attr('src')
});
}
);
$.ajax({
url : 'http://123.206.89.242:9999',
type : 'post',
data : JSON.stringify(submitArr),
dataType: 'json',
//processData: false, 用FormData傳fd時需有這兩項
//contentType: false,
success : function(data){
console.log('傳回的資料:'+JSON.stringify(data))
}
})
}
$("#select").click(function(){
oInput.value = ""; // 先将oInput值清空,否則選擇圖檔與上次相同時change事件不會觸發
//清空已選圖檔
$('.float').remove();
oInput.click();
})
$("#add").click(function(){
oInput.value = ""; // 先将oInput值清空,否則選擇圖檔與上次相同時change事件不會觸發
oInput.click();
})
$("#submit").click(function(){
if(!dataArr.length){
return alert('請先選擇檔案');
}
send();
})
} )
function ReSizePic(ThisPic) {
var RePicWidth = 200; //這裡修改為您想顯示的寬度值
var TrueWidth = ThisPic.width; //圖檔實際寬度
var TrueHeight = ThisPic.height; //圖檔實際高度
if(TrueWidth>TrueHeight){
//寬大于高
var reWidth = RePicWidth;
ThisPic.width = reWidth;
//垂直居中
var nowHeight = TrueHeight * (reWidth/TrueWidth);
return nowHeight; //将圖檔修改後的高度傳回,供垂直居中用
}else{
//寬小于高
var reHeight = RePicWidth;
ThisPic.height = reHeight;
}
}
</script>
</html>
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