查看jQuery file upload的image preview如何工作的
查看readme中的说明,
- JavaScript Load Image library v. 1.13.0+: Required for the image previews and resizing functionality.
- JavaScript Canvas to Blob polyfill v. 2.1.1+:Required for the image previews and resizing functionality.
注释掉这个js的引用
<!-- The Load Image plugin is included for the preview images and image resizing functionality -->
<!--<script src="//blueimp.github.io/JavaScript-Load-Image/js/load-image.all.min.js"></script>-->
然后发现错误在loadImage.parseMetaData,提示loadImage undefined
loadImageMetaData: function (data, options) {
if (options.disabled) {
return data;
}
var that = this,
dfd = $.Deferred();
loadImage.parseMetaData(data.files[data.index], function (result) {
$.extend(data, result);
dfd.resolveWith(that, [data]);
}, options);
return dfd.promise();
},
在loadImageMetaData函数前面,加上console.trace(); 刷新页面,再次尝试,然后查看stack trace,但是这个结果没有意义。可读性太差了。
使用stacktrace.js查看堆栈信息
引用https://cdnjs.cloudflare.com/ajax/libs/stacktrace.js/2.0.0/stacktrace.js,然后在loadImageMetaData函数处,输出堆栈信息
var callback = function(stackframes) {
var stringifiedStack = stackframes.map(function(sf) {
return sf.toString();
}).join('\n');
console.log(stringifiedStack);
}; var errback = function(err) { console.log(err.message); }; StackTrace.get().then(callback).catch(errback);
loadImageMetaData()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload-image.js:289:28
func()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload-process.js:84:65
_processFile: function (data, originalData) {
var that = this,
dfd = $.Deferred().resolveWith(that, [data]),
chain = dfd.promise();
this._trigger('process', null, data);
$.each(data.processQueue, function (i, settings) {
var func = function (data) {
if (originalData.errorThrown) {
return $.Deferred()
.rejectWith(that, [originalData]).promise();
}
return that.processActions[settings.action].call(
that,
data,
settings
);
};
chain = chain.then(func, settings.always && func);
});
chain
.done(function () {
that._trigger('processdone', null, data);
that._trigger('processalways', null, data);
})
.fail(function () {
that._trigger('processfail', null, data);
that._trigger('processalways', null, data);
});
return chain;
},
function()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3305:32
apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3148:29
add()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3194:6
function()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3304:28
callback.apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:384:22
jQuery.each()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3301:13
promise.promise()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3361:8
jQuery.Deferred(function()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3300:19
_processFile/<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload-process.js:90:31
chain = chain.then(func, settings.always && func);
callback.apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:384:22
_processFile()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload-process.js:78:15
$.each(data.processQueue, function (i, settings) {
$.widget/</proxiedPrototype[prop]</<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/vendor/jquery.ui.widget.js:127:25
returnValue = value.apply( this, arguments );
func()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload-process.js:153:41
return that._processFile(opts, data);
function()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3305:32
apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3148:29
add()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3194:6
function()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3304:28
callback.apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:384:22
jQuery.each()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3301:13
promise.promise()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3361:8
jQuery.Deferred(function()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3300:19
process/<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload-process.js:157:67
that._processingQueue = that._processingQueue.then(func, func)
callback.apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:384:22
process()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload-process.js:146:19
$.each(data.files, function (index) {
$.widget/</proxiedPrototype[prop]</<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/vendor/jquery.ui.widget.js:127:25
returnValue = value.apply( this, arguments );
$.widget.bridge/$.fn[name]/<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/vendor/jquery.ui.widget.js:220:39
methodValue = instance[ options ].apply( instance, args );
callback.apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:384:22
each()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:136:16
$.widget.bridge/$.fn[name]()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/vendor/jquery.ui.widget.js:206:9
this.each(function() {
add/<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload-ui.js:115:34
return $this.fileupload('process', data);
function()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3305:32
apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3148:29
add()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3194:6
function()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3304:28
callback.apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:384:22
jQuery.each()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3301:13
promise.promise()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3361:8
jQuery.Deferred(function()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3300:19
_addConvenienceMethods/data.process()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload.js:663:27
).then(resolveFunc, rejectFunc);
add()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload-ui.js:114:22
data.process(function () {
_trigger()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/vendor/jquery.ui.widget.js:527:13
callback.apply( this.element[0], [ event ].concat( data ) ) === false ||
event.isDefaultPrevented() );
_onAdd/<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload.js:1037:31
result = that._trigger(
'add',
$.Event('add', {delegatedEvent: e}),
newData
);
callback.apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:384:22
_onAdd()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload.js:1030:15
$.each(fileSet || files, function (index, element) {
$.widget/</proxiedPrototype[prop]</<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/vendor/jquery.ui.widget.js:127:25
returnValue = value.apply( this, arguments );
_onChange/<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload.js:1236:26
that._onAdd(e, data);
apply()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3148:29
add()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3194:6
always()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:3295:14
_onChange()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/jquery.fileupload.js:1226:53
this._getFileInputFiles(data.fileInput).always(function (files) {
$.widget/</proxiedPrototype[prop]</<()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/vendor/jquery.ui.widget.js:127:25
handlerProxy()@http://172.31.212.20:8082/jQuery-File-Upload-Demo/js/vendor/jquery.ui.widget.js:438:7
return ( typeof handler === "string" ? instance[ handler ] : handler )
.apply( instance, arguments );
event.namespace_re.test()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:4670:8
handle()@http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.js:4338:27
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