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https://issues.apache.org/jira/browse/CB-13179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617912#comment-16617912
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ASF GitHub Bot commented on CB-13179:
-------------------------------------
raphinesse commented on issue #215: CB-13179:(all) invoke onEvent listener with
_realReader as applyThis
URL:
https://github.com/apache/cordova-plugin-file/pull/215#issuecomment-422110071
@JiaLiPassion you can also set up Travis for your fork of the repo. Might be
less work and you can make use of the CI config
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> Cordova file plugin onEvent(such as onload) should be invoked with
> _realReader as this
> --------------------------------------------------------------------------------------
>
> Key: CB-13179
> URL: https://issues.apache.org/jira/browse/CB-13179
> Project: Apache Cordova
> Issue Type: Improvement
> Components: cordova-plugin-file
> Environment: Android, ios, Browser
> Reporter: Jia Li
> Priority: Minor
> Labels: features
>
> When `FileReader` add onEvent listener such as `onload`, it will add the
> listener to inner `_realReader` , but when it invoke the listener, it use the
> FileReader as `this`.
> 1. When add onload listener in application code.
> ```javascript
> var fileReader = new FileReader();
> fileReader.onload = function() {};
> ```
> it will call `www/FileReader.js defineEvent`
> ```javascript
> function defineEvent(eventName) {
> utils.defineGetterSetter(FileReader.prototype, eventName, function() {
> return this._realReader[eventName] || null;
> }, function(value) {
> this._realReader[eventName] = value;
> });
> }
> ```
> the listener is added to `this._realReader`.
> And when the listener is triggered for example in `readSuccessCallback`
> it will invoke the method with `this`.
> ```javascript
> this.onload(new ProgressEvent("load", {target:this}));
> ```
> in the normal senario, it will ok, but when it work with some polyfilles such
> as `zone.js of angular4`, it will fail because `zone.js` have some special
> handling which require the `this` object be the same when add listener and
> invoke listener.
> https://github.com/angular/zone.js/issues/868
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