uncaught typeerror cannot read property addeventlistener of undefined

Item is a piece of data requested from the background, which contains IMG, but prompts that IMG is not definedCode of the Child component when the parent component transmits data to the child component:Tip:Cause: it may be that the page rendering and request data are asynchronous operations, the data has not been requested to end, the page has started rendering, so at the beginning of reporting undefined variables, after the data acquisition is comple

Because the diagram is convenient, copied someone else wrote a Jquerry plug-in, run-time "var pos = ($.browser.msie parseint ($.browser.version) Search the Internet, http://stackoverflow.com/questions/14923301/. Uncaught-typeerror-cannot-read-property-msie-of-undefined-jque

Reactjs uncaught typeerror:cannot Read Property ' location ' of undefinedReactjs routing configuration How to jump unsuccessful domestic search engine find half a day can not find useful information so GoolgePackage.json inside Configuration: "React-router": "^3.0.0" changed to 3.x on it, change the implementation of NPM installOriginal reference: https://github.

Write a demo of jquery mobileOpened with a browser, found no style, opened the console found a bug reportedOn the stack overflow looked up, because jquery mobile and jquery version mismatch, my current version of jquery Mobile is 1.4.5,jquery version 3.2.1, jquery again under the 2 version of the trial, It's possible for me to 1.9.1.JQuery Mobile Error Uncaught typeerror:cannot Read

Recently, when doing form verification, the Addmethod method of his own writing always does not work, tossing the time close to the day. The following errors are reported uncaught Typeerror:cannot Read Property ' call ' of undefinedjquery.validate.min.js:28 First look at the layout of my own page. top.jsp The above-referenced form for the top.jsp hea

Today, I encountered a problem and found that many people on foreign websites are asking questions. Some people suspect that this is an unknown bug .. SeeCode: If you click submit, the following error will be reported: "Uncaught typeerror: Property 'submit 'of object # Actually, it's actually .. All of this is because you wrote the button for type and th

Problem Description:Recently learned to use Discuz to imitate a portal site, inside to the navigation bar to make a sliding effect, to use jquery, will use jquery reference to Header.htm, as shown in:However, since Discuz uses PHP and its own mechanism, the $ in jquery will conflict with the Common.js and forum.js of Discuz itself, resulting in the following error causing the drop-down listWorkaround:Workaround: Redefine jquery's $, for example, I will use JQ to represent jquery's $At the end of

Server is fully provisioned but in client codeLet query = new Parse.query (' Notification ');Let subscription = Query.subscribe ();Subscription.on (' Open ', () = {Console.log (' subscription opened ');});Throw error: TypeError not captured: Unable to read the subscription defined by the property "OnNext". Line No. 3894Line No. 3894key: ‘pushData‘,Value:function

When debugging Three.js execution loading curtain, suddenly burst out this error three.js uncaught typeerror:cannot Read property ' getextension ' of NULL, query for half a day and no results foundFinally suddenly thought is not the browser setup problem, check the WebGL, sure enough reinstall the browser does not open, after normal open, display normalMark, plea

Prompt for errors when you do not need to validate a select Uncaught typeerror:cannot Read property ' param ' of NULL When viewing the source code, it is found that the following function can cause problems when the select does not add any events: Datarules:function (Element) {var method, value,Rules = {}, $element = $ (element);For (method in $.validator.meth

JS in the browser reported the following error (in Chrome): uncaught typeerror:cannot Read Property ' style ' of NULL browser if the following error is reported (in Chrome):uncaughttypeerror:cannotread property ' style ' ofnull what does this error mean? (You need to master the processing of JS common errors and common

IntroductionThe use of react-router feel or there is a certain "curve", first of all to be familiar with ES6 and do not say, for JSX extended grammar and React-router about the route of the expression of a little sloppy can not. When the error appears title, I searched the network, unexpectedly did not find several places to refer to. There is one of the following:https://teamtreehouse.com/community/typeerror-cannot-

An error occurred while using mongodb for Express. // Settings. js Module. exports = { CookieSecret: "xxxx ", Db: "dbname ", Host: "localhost ", } // App. js Var express = require ("express "); Var settings = require ("./settings "); Error code for loading connect-mongo: Var MongoStore = require ("connect-mongo") (express ); App. use (express. session ({Secret: Settings. cookieSecret,Key: Settings. db,Cookie: {maxAge: 1000*60*60*24*30}, // 30 daysStore: new External store ({Db: Settings. db})}

Initial use of Yii's Srbac module. Cannot read property ' MSIE ' of undefined error appears. Online Search, find the following article. Using the method of patching at the end of the text, successful. Thank.===============================http://blchen.com/jquery-can-not-read-proper