1.html页面
1.在input标签内加上这个属性就可以一次性上传多个文件
2.长按ctrl键选择多个图片
效果如图：
上面图中显示选中五个文件，并且在页面回显，下面js里面有回显代码
2.js页面回显图片+多文件上传
1.在input框下面定义显示图片的div区域，在input标签里面写上onchange方法，因为我用的是vue框架，所以写的是@change:
2.在方法里面写上代码，这样可以把所有图片都遍历显示出来
setImagePreview:function(){
//补充说明：因为我们给input标签设置multiple属性，因此一次可以上传多个文件
//获取选择图片的个数
var dom = document.getElementById("img");
var files = dom.files;
var length = files.length;
var imgObjPreview = document.getElementById("localImag");
//3、回显
imgObjPreview.innerHTML = "";
$.each(files,function(key,value){
//每次都只会遍历一个图片数据
var img = document.createElement("img");
var imgObjPreview = document.getElementById("localImag");
var fr = new FileReader();
fr.onload = function(){
img.src=this.result;
img.style.width="50px";
img.style.height="70px";
img.style.marginRight="10px";
img.style.marginTop="10px";
img.id=key+"img";
imgObjPreview.appendChild(img);
}
fr.readAsDataURL(value);//读取文件
})
}
3.多文件上传
这里写文件标签的id
$.ajaxFileUpload({
url: '../../br/detial/problem/upload',
type: 'post',
fileElementId: ['img'],
data: {checkReportId: checkReportId, componentName: componentName,problemDesc:problemDesc,
badNumber:badNumber,badPosition:badPosition,fixMeasures:fixMeasures,xgps:xgps,ygps:ygps,
problemLevel:problemLevel,isSign:isSign},
dataType: 'json',
success: function (data, status) {
dialogMsg('添加成功！');
dialogClose();
if(data.code=='0'){
dialogMsg(data.msg, 'success');
}else{
dialogMsg(data.msg, 'error');
}
},
error: function (data, status, e) {
dialogMsg(e, 'error')
}
});
用这个$.ajaxFileUpload需要引入ajaxfileupload.js：下面是js：
jQuery.extend({
createUploadIframe: function (id, uri) {
//create frame
var frameId = 'jUploadFrame' + id;
var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
if (window.ActiveXObject) {
if (typeof uri == 'boolean') {
iframeHtml += ' src="' + 'javascript:false' + '"';
}
else if (typeof uri == 'string') {
iframeHtml += ' src="' + uri + '"';
}
}
iframeHtml += ' />';
jQuery(iframeHtml).appendTo(document.body);
return jQuery('#' + frameId).get(0);
},
createUploadForm: function (id, fileElementId, data, fileElement) {
//create form
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = jQuery('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
if (data) {
for (var i in data) {
jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
}
}
if (typeof (fileElementId) == 'string') {
fileElementId = [fileElementId];
}
for (var i in fileElementId) {
var oldElement = jQuery('#' + fileElementId[i]);
var newElement = jQuery(oldElement).clone(true,true);
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
}
//set attributes
jQuery(form).css('position', 'absolute');
jQuery(form).css('top', '-1200px');
jQuery(form).css('left', '-1200px');
jQuery(form).appendTo('body');
return form;
},
ajaxFileUpload: function (s) {
// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = new Date().getTime()
var form = jQuery.createUploadForm(id, s.fileElementId, (typeof (s.data) == 'undefined' ? false : s.data), s.fileElement);
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
// Watch for a new set of requests
if (s.global && !jQuery.active++) {
jQuery.event.trigger("ajaxStart");
}
var requestDone = false;
// Create the request object
var xml = {}
if (s.global)
jQuery.event.trigger("ajaxSend", [xml, s]);
// Wait for a response to come back
var uploadCallback = function (isTimeout) {
var io = document.getElementById(frameId);
try {
if (io.contentWindow) {
xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;
} else if (io.contentDocument) {
xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
}
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
if (xml || isTimeout == "timeout") {
requestDone = true;
var status;
try {
status = isTimeout != "timeout" ? "success" : "error";
// Make sure that the request was successful or notmodified
if (status != "error") {
// process the data (runs the xml through httpData regardless of callback)
var data = jQuery.uploadHttpData(xml, s.dataType);
// If a local callback was specified, fire it and pass it the data
if (s.success)
s.success(data, status);
// Fire the global callback
if (s.global)
jQuery.event.trigger("ajaxSuccess", [xml, s]);
} else
jQuery.handleError(s, xml, status);
} catch (e) {
status = "error";
jQuery.handleError(s, xml, status, e);
}
// The request was completed
if (s.global)
jQuery.event.trigger("ajaxComplete", [xml, s]);
// Handle the global AJAX counter
if (s.global && ! --jQuery.active)
jQuery.event.trigger("ajaxStop");
// Process result
if (s.complete)
s.complete(xml, status);
jQuery(io).unbind()
setTimeout(function () {
try {
jQuery(io).remove();
jQuery(form).remove();
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
}, 100)
xml = null
}
}
// Timeout checker
if (s.timeout > 0) {
setTimeout(function () {
// Check to see if the request is still happening
if (!requestDone) uploadCallback("timeout");
}, s.timeout);
}
try {
var form = jQuery('#' + formId);
jQuery(form).attr('action', s.url);
jQuery(form).attr('method', 'POST');
jQuery(form).attr('target', frameId);
if (form.encoding) {
jQuery(form).attr('encoding', 'multipart/form-data');
}
else {
jQuery(form).attr('enctype', 'multipart/form-data');
}
jQuery(form).submit();
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
jQuery('#' + frameId).load(uploadCallback);
return {
abort: function () {
try {
jQuery('#' + frameId).remove();
jQuery(form).remove();
}
catch (e) { }
}
};
},
uploadHttpData: function (r, type) {
var data = !type;
data = type == "xml" || data ? r.responseXML : r.responseText;
// If the type is "script", eval it in global context
if (type == "script")
jQuery.globalEval(data);
// Get the JavaScript object, if JSON is used.
if (type == "json") {
data = r.responseText;
var start = data.indexOf(">");
if (start != -1) {
var end = data.indexOf("<", start + 1);
if (end != -1) {
data = data.substring(start + 1, end);
}
}
eval("data = " + data);
}
// evaluate scripts within html
if (type == "html")
jQuery("<div>").html(data).evalScripts();
return data;
},
handleError: function (s, xml, status, e) {
// If a local callback was specified, fire it
if (s.error)
s.error(xml, status, e);
// Fire the global callback
if (s.global)
jQuery.event.trigger("ajaxError", [xml, s, e]);
}
});
function checkFileExt (fileName, fileExts) {
var check = false;
var index = fileName.lastIndexOf(".");
var ext = fileName.substr(index+1);
for(var i=0; i<fileExts.length; i++) {
if (ext == fileExts[i]) {
check = true;
break;
}
}
return check;
}