Javascript Filereader:多个文件输入仅以一个图像作为预览结束
试图找出如何一次输入多个文件并将它们排列到div。结果,仅显示阵列的最后一个图像 HTML:Javascript Filereader:多个文件输入仅以一个图像作为预览结束,javascript,html,css,filereader,Javascript,Html,Css,Filereader,试图找出如何一次输入多个文件并将它们排列到div。结果,仅显示阵列的最后一个图像 HTML: <input type="file" id="imageinput" accept="image/*" onchange="handleFiles(files)" multiple> <div class="cube-layout-1"> <div id="preview1"></div> <div id="p
<input type="file" id="imageinput" accept="image/*" onchange="handleFiles(files)" multiple>
<div class="cube-layout-1">
<div id="preview1"></div>
<div id="preview2"></div>
<div id="preview3"></div>
<div id="preview4"></div>
<div id="preview5"></div>
<div id="preview6"></div>
</div>
var j=0;
function counter() {
j++;
return j;
}
function handleFiles(files) {
for (var i = 0; i < files.length; i++) {
var file = files[i];
var count = counter();
var preview = document.getElementById("preview"+count);
var reader = new FileReader();
reader.onload = (function (preview) {
return function () {
preview.style.backgroundImage = "url(" + reader.result + ")";
}
})(preview);
reader.readAsDataURL(file);
}
}
Javascript:
<input type="file" id="imageinput" accept="image/*" onchange="handleFiles(files)" multiple>
<div class="cube-layout-1">
<div id="preview1"></div>
<div id="preview2"></div>
<div id="preview3"></div>
<div id="preview4"></div>
<div id="preview5"></div>
<div id="preview6"></div>
</div>
var j=0;
function counter() {
j++;
return j;
}
function handleFiles(files) {
for (var i = 0; i < files.length; i++) {
var file = files[i];
var count = counter();
var preview = document.getElementById("preview"+count);
var reader = new FileReader();
reader.onload = (function (preview) {
return function () {
preview.style.backgroundImage = "url(" + reader.result + ")";
}
})(preview);
reader.readAsDataURL(file);
}
}
var j=0;
函数计数器(){
j++;
返回j;
}
函数句柄文件(文件){
对于(var i=0;i
例如,如果我一次选择3个图像,前两个div得到一个空的背景图像,只有最后一个div得到图像。
我知道这与reader.onload事件有关,它只在循环结束时触发……但是我如何才能实现我的目标呢?提前谢谢 得到的解决方案替代了:
return function () { preview.style.backgroundImage = "url(" + reader.result + ")";}
应该是:
return function (e) { preview.style.backgroundImage = "url(" + e.target.result + ")";}
查看我的代码尝试使用它,我解决了异步问题,因为我需要在预览时添加文件名
function readURL(input) {
var file = document.getElementById("article_file").value;
console.log(file);
var originalname = file.replace(/C:\\fakepath\\/i, '');
console.log(name);
if (DST()) {
// Daylight Savings, EDT is UTC-4
var offset = "-4";
} else {
// Not Daylight Savings, EST is UTC-5
var offset = "-5";
}
var today = calcTime(offset);
var month = today.getMonth() + 1;
// appends 0 to monthes under 10
if (month < 10)
month = "0" + month.toString();
if ($('table.appendo.image-uploader tbody tr').length > 2)
$('table.appendo.image-uploader tbody tr').each(function (i, ele) {
if(i==1)
{
$('#image-preview-path').attr('src','src="/images/tp.gif"');
$('#image-path').attr('value','');
}
else if (i > 1)
{
$(ele).remove();
}
});
$('.upload-article').attr('name', 'Filedata[]');
var files = $('#article_file')[0].files;
var name = [];
var extension = ['.jpg','jpeg','.gif','.png'];
var flag = 1;
name['invalid'] = 'invalid';
for (var z = 0; z < files.length; z++){
var ext = (files[z].name.substr(-4)).toLowerCase();
if($.inArray(ext, extension) != -1){
} else {
flag = 2;
}
}
var count = files.length;
if(count <= '6') {
if(flag == 1) {
for (var x = 0; x < files.length; x++)
{
if (x == 0) {
var file = files[x];
var hello = file['name'].replace(/\s/g, '');
var file_name = hello.replace(/[^.a-z0-9_-\s]/gi, '').replace(/[_\s]_/g, '-');
name[file['size']] = file_name;
console.log(files[x]);
var reader = new FileReader();
reader.addEventListener('load', function (e) {
console.log(e)
$('#image-preview-path').attr('src', e.target.result);
$('#image-path').attr('value', "/images/uploads/" + today.getFullYear() + "/" + month + "/" + today.getDate() + "/" + name[e.total]);
});
reader.onerror = function (event) {
console.error("File could not be read! Code " + event.target.error.code);
};
reader.readAsDataURL(file);
} else {
var file = files[x];
var hello = file['name'].replace(/\s/g, '');
var file_name = hello.replace(/[^.a-z0-9_-\s]/gi, '').replace(/[_\s]_/g, '-');
name[file['size']] = file_name;
console.log(files[x]);
var reader = new FileReader();
reader.addEventListener('load', function (e) {
console.log(e)
if ($('table.appendo>tbody:eq(0)>tr').length - 1 > 0)
index = $('table.appendo>tbody:eq(0)>tr').length - 1
else
index = 'invalid';
var table = $('table.appendo tbody tr:eq(1)').clone();
table.find('img').attr('id', 'image-preview-path');
table.find('img').attr('src', e.target.result);
table.find('input').attr('id', 'image-path');
table.find('input').attr('value', "/images/uploads/" + today.getFullYear() + "/" + month + "/" + today.getDate() + "/" + name[e.total]);
$('table.appendo.image-uploader tbody').append(table);
});
reader.onerror = function (event) {
console.error("File could not be read! Code " + event.target.error.code);
};
reader.readAsDataURL(file);
}
}
} else {
alert('Not a valid file extension.');
$('#article_file').val("");
}
} else {
alert('You have attempted to queue too many files.\nYou may select six file.');
$('#article_file').val("");
}
}
函数readURL(输入){
var file=document.getElementById(“article_file”).value;
console.log(文件);
var originalname=file.replace(/C:\\fakepath\\/i,,);
console.log(名称);
if(DST()){
//夏令时,EDT是UTC-4
var offset=“-4”;
}否则{
//不是夏令时,EST是UTC-5
var offset=“-5”;
}
var today=计算时间(偏移量);
var month=today.getMonth()+1;
//将0追加到10以下的月份
如果(月<10)
month=“0”+month.toString();
如果($('table.appendo.image-uploader tbody tr')。长度>2)
$('table.appendo.image-uploader tbody tr')。每个(函数(i,ele){
如果(i==1)
{
$(“#图像预览路径”).attr('src','src=“/images/tp.gif”);
$('#图像路径').attr('value','');
}
否则,如果(i>1)
{
$(ele.remove();
}
});
$('.upload article').attr('name','Filedata[]);
var files=$(“#文章_文件”)[0]。文件;
变量名称=[];
变量扩展名=['.jpg'、'jpeg'、'.gif'、'.png'];
var标志=1;
名称['invalid']='invalid';
对于(var z=0;ztbody:eq(0)>tr')。长度-1
其他的
索引='无效';
var table=$('table.appendo tbody tr:eq(1)').clone();
table.find('img').attr('id','image preview path');
表.find('img').attr('src',e.target.result);
table.find('input').attr('id','image path');
table.find('input').attr('value',“/images/uploads/”+today.getFullYear()+“/”+month+“/”+today.getDate()+“/”+name[e.total]);
$('table.appendo.image-uploader tbody').append(table);
});
reader.onerror=函数(事件){
console.error(“无法读取文件!代码”+event.target.error.Code);
};
reader.readAsDataURL(文件);
}
}
}否则{
警报('不是有效的文件扩展名');
$(“#文章_文件”).val(“”);
}
}否则{
警报('您试图将太多文件排队。\n您可以选择六个文件');
$(“#文章_文件”).val(“”);
}
}