测试

修改https://github.com/tkvw/jQuery-File-Upload/blob/master/basic-plus.html

var node = $('<p id="chuck" class="preview"/>')
.append($('<span/>').text(file.name));

给p增加id和class,在页面加载后,

打开浏览器的console,然后手动执行,然后单击图片。会发现这个事件是会触发的

$(".preview").on("click", function(){
alert("test");
})

但是jquery.fileupload-image-editor.js中的没有触发,事件应该是绑定了

手动移除事件

$(".preview").off("click");  https://stackoverflow.com/questions/209029/best-way-to-remove-an-event-handler-in-jquery

分析

1.jquery.fileupload-image-editor.js定义了uploadImageEditorPreviewSelector

uploadImageEditorPreviewSelector: 'click .preview',

2,.jquery.fileupload-ui.js中定义了filesContainer
// The container for the list of files. If undefined, it is set to
// an element with class "files" inside of the widget element:
filesContainer: undefined,

_initEventHandlers: function () {
this._super();

var handlers = {};
handlers[this.options.uploadImageEditorPreviewSelector] = this._previewHandler.bind(this);

this._on(this.options.filesContainer, handlers);
},

文件上传之后

jquery.fileupload.js中_onAdd: function (e, data) {

that._initResponseObject(newData);
that._initProgressObject(newData);
that._addConvenienceMethods(e, newData);
result = that._trigger(
'add',
$.Event('add', {delegatedEvent: e}),
newData
);
return result;

_initResponseObject: function (obj) {
var prop;
if (obj._response) {
for (prop in obj._response) {
if (obj._response.hasOwnProperty(prop)) {
delete obj._response[prop];
}
}
} else {
obj._response = {};
}
},

_initProgressObject: function (obj) {
var progress = {
loaded: 0,
total: 0,
bitrate: 0
};
if (obj._progress) {
$.extend(obj._progress, progress);
} else {
obj._progress = progress;
}
},

 // Adds convenience methods to the data callback argument:
_addConvenienceMethods: function (e, data) {
var that = this,
getPromise = function (args) {
return $.Deferred().resolveWith(that, args).promise();
};
data.process = function (resolveFunc, rejectFunc) {
if (resolveFunc || rejectFunc) {
data._processQueue = this._processQueue =
(this._processQueue || getPromise([this])).then(
function () {
if (data.errorThrown) {
return $.Deferred()
.rejectWith(that, [data]).promise();
}
return getPromise(arguments);
}
).then(resolveFunc, rejectFunc);
}
return this._processQueue || getPromise([this]);
};
data.submit = function () {
if (this.state() !== 'pending') {
data.jqXHR = this.jqXHR =
(that._trigger(
'submit',
$.Event('submit', {delegatedEvent: e}),
this
) !== false) && that._onSend(e, this);
}
return this.jqXHR || that._getXHRPromise();
};
data.abort = function () {
if (this.jqXHR) {
return this.jqXHR.abort();
}
this.errorThrown = 'abort';
that._trigger('fail', null, this);
return that._getXHRPromise(false);
};
data.state = function () {
if (this.jqXHR) {
return that._getDeferredState(this.jqXHR);
}
if (this._processQueue) {
return that._getDeferredState(this._processQueue);
}
};
data.processing = function () {
return !this.jqXHR && this._processQueue && that
._getDeferredState(this._processQueue) === 'pending';
};
data.progress = function () {
return this._progress;
};
data.response = function () {
return this._response;
};
},

jquery.ui.widget.js里面的_trigger函数

this.element.trigger( event, data );

打印event

jQuery.Event {originalEvent: j…y.Event, type: "fileuploadadd", isDefaultPrevented: ƒ, timeStamp: 1561917127348, jQuery111304105261403454039: true, …}currentTarget: input#fileuploaddata: undefineddelegateTarget: input#fileuploaddelegatedEvent: jQuery.Event {originalEvent: Event, type: "change", isDefaultPrevented: ƒ, timeStamp: 33359.854999987874, jQuery111304105261403454039: true, …}handleObj: {type: "fileuploadadd", origType: "fileuploadadd", data: undefined, handler: ƒ, guid: 20, …}isDefaultPrevented: ƒ returnFalse()isTrigger: 3jQuery111304105261403454039: truenamespace: ""namespace_re: nulloriginalEvent: jQuery.Event {type: "add", delegatedEvent: j…y.Event, timeStamp: 1561917127348, jQuery111304105261403454039: true}result: undefinedtarget: input#fileuploadtimeStamp: 1561917127348type: "fileuploadadd"__proto__: Object

trigger后面的代码是

return !( $.isFunction( callback ) &&
callback.apply( this.element[0], [ event ].concat( data ) ) === false ||
event.isDefaultPrevented() );

callback对应下面的add

// The add callback is invoked as soon as files are added to the fileupload
// widget (via file input selection, drag & drop or add API call).
// See the basic file upload widget for more information:
add: function (e, data) {
if (e.isDefaultPrevented()) {
return false;
}
var $this = $(this),
that = $this.data('blueimp-fileupload') ||
$this.data('fileupload'),
options = that.options;
data.context = that._renderUpload(data.files)
.data('data', data)
.addClass('processing');
options.filesContainer[
options.prependFiles ? 'prepend' : 'append'
](data.context);
that._forceReflow(data.context);
that._transition(data.context);
data.process(function () { //这里的process是在_addConvenienceMethods里面定义的
return $this.fileupload('process', data);
}).always(function () {
data.context.each(function (index) {
$(this).find('.size').text(
that._formatFileSize(data.files[index].size)
);
}).removeClass('processing');
that._renderPreviews(data);
}).done(function () {
data.context.find('.start').prop('disabled', false);
if ((that._trigger('added', e, data) !== false) &&
(options.autoUpload || data.autoUpload) &&
data.autoUpload !== false) {
data.submit();
}
}).fail(function () {
if (data.files.error) {
data.context.each(function (index) {
var error = data.files[index].error;
if (error) {
$(this).find('.error').text(error);
}
});
}
});
},

jquery.fileupload-ui.js里面的

 _renderUpload: function (files) {
return this._renderTemplate(
this.options.uploadTemplate, //自己做测试的,这边是null
files
);
},
_renderTemplate: function (func, files) {
if (!func) {
return $(); //自己做测试,这边就返回了
}
var result = func({
files: files,
formatFileSize: this._formatFileSize,
options: this.options
});
if (result instanceof $) {
return result;
}
return $(this.options.templatesContainer).html(result).children();
},
_forceReflow: function (node) {
return $.support.transition && node.length &&
node[0].offsetWidth;
},
_transition: function (node) {
var dfd = $.Deferred();
if ($.support.transition && node.hasClass('fade') && node.is(':visible')) {
node.bind(
$.support.transition.end,
function (e) {
// Make sure we don't respond to other transitions events
// in the container element, e.g. from button elements:
if (e.target === node[0]) {
node.unbind($.support.transition.end);
dfd.resolveWith(node);
}
}
).toggleClass('in');
} else {
node.toggleClass('in');
dfd.resolveWith(node);

}
return dfd;
},
 data.process = function (resolveFunc, rejectFunc) {
if (resolveFunc || rejectFunc) {
data._processQueue = this._processQueue =
(this._processQueue || getPromise([this])).then(
function () {
if (data.errorThrown) {
return $.Deferred()
.rejectWith(that, [data]).promise();
}
return getPromise(arguments);
}
).then(resolveFunc, rejectFunc);
}
return this._processQueue || getPromise([this]);
};

然后跳转jquery.fileupload-ui.js里面

 // Processes the files given as files property of the data parameter,
// returns a Promise object that allows to bind callbacks:
process: function (data) {
var that = this,
options = $.extend({}, this.options, data);
if (options.processQueue && options.processQueue.length) {
this._transformProcessQueue(options);
if (this._processing === 0) {
this._trigger('processstart');
}
$.each(data.files, function (index) {
var opts = index ? $.extend({}, options) : options,
func = function () {
if (data.errorThrown) {
return $.Deferred()
.rejectWith(that, [data]).promise();
}
return that._processFile(opts, data);
};
opts.index = index;
that._processing += 1;
that._processingQueue = that._processingQueue.then(func, func)
.always(function () {
that._processing -= 1;
if (that._processing === 0) {
that._trigger('processstop');
}
});
});
}
return this._processingQueue;
},
// Replaces the settings of each processQueue item that
// are strings starting with an "@", using the remaining
// substring as key for the option map,
// e.g. "@autoUpload" is replaced with options.autoUpload:
_transformProcessQueue: function (options) {
var processQueue = [];
$.each(options.processQueue, function () {
var settings = {},
action = this.action,
prefix = this.prefix === true ? action : this.prefix;
$.each(this, function (key, value) {
if ($.type(value) === 'string' &&
value.charAt(0) === '@') {
settings[key] = options[
value.slice(1) || (prefix ? prefix +
key.charAt(0).toUpperCase() + key.slice(1) : key)
];
} else {
settings[key] = value;
} });
processQueue.push(settings);
});
options.processQueue = processQueue;
},
 processstart: function (e) {
if (e.isDefaultPrevented()) {
return false;
}
$(this).addClass('fileupload-processing');
},

然后是jquery.fileupload-process.js里面的

_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;
},
 // Processes the files given as files property of the data parameter,
// returns a Promise object that allows to bind callbacks:
process: function (data) {
var that = this,
options = $.extend({}, this.options, data);
if (options.processQueue && options.processQueue.length) {
this._transformProcessQueue(options);
if (this._processing === 0) {
this._trigger('processstart');
}
$.each(data.files, function (index) {
var opts = index ? $.extend({}, options) : options,
func = function () {
if (data.errorThrown) {
return $.Deferred()
.rejectWith(that, [data]).promise();
}
return that._processFile(opts, data);
};
opts.index = index;
that._processing += 1;
that._processingQueue = that._processingQueue.then(func, func)
.always(function () {
that._processing -= 1;
if (that._processing === 0) {
that._trigger('processstop');
}
});
});
}
return this._processingQueue;
},

结论

绑定事件的时候依赖于this.options.filesContainer,这玩意不存在于jquery.fileupload.js里面

 _initEventHandlers: function () {
this._super(); var handlers = {};
handlers[this.options.uploadImageEditorPreviewSelector] = this._previewHandler.bind(this);
console.log(`filesContainer = ${this.options.filesContainer}`);
this._on(this.options.filesContainer, handlers);
},

而filesContainer在jquery.fileupload-ui.js中

 // The container for the list of files. If undefined, it is set to
// an element with class "files" inside of the widget element:
filesContainer: undefined, _initFilesContainer: function () {
var options = this.options;
if (options.filesContainer === undefined) {
options.filesContainer = this.element.find('.files');
} else if (!(options.filesContainer instanceof $)) {
options.filesContainer = $(options.filesContainer);
}
},

因为basic.html没有引用jquery.fileupload-ui.js,所以导致事件绑定失败。

顺便打印一下this.element

console.log(`filesContainer = ${this.options.filesContainer}`);
console.log(this.element);

自己手动复制函数,然后在_initEventHandlers里面调用

  _initFilesContainer: function () {
var options = this.options;
if (options.filesContainer === undefined) {
options.filesContainer = this.element.find('.files');
} else if (!(options.filesContainer instanceof $)) {
options.filesContainer = $(options.filesContainer);
}
},
_initEventHandlers: function () {
this._super();
this._initFilesContainer();
var handlers = {};
handlers[this.options.uploadImageEditorPreviewSelector] = this._previewHandler.bind(this);
this._on(this.options.filesContainer, handlers);
},

页面加载后,进行查询

$('#fileupload').fileupload('option', 'filesContainer')

在还有jquery.fileupload-ui.js里面还有关于uploadTemplateID的设置

options: {
// By default, files added to the widget are uploaded as soon
// as the user clicks on the start buttons. To enable automatic
// uploads, set the following option to true:
autoUpload: false,
// The ID of the upload template:
uploadTemplateId: 'template-upload',
// The ID of the download template:
downloadTemplateId: 'template-download',

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