cannot read property slice of undefined

"} ] }} This is the REACT code It should be because when the first render is initialized the asynchronous data is returned before the listdata is undefined, giving an initial value []. Did you see the error message? Cannot read property 'map' of undefined the obj

JQuery cannot read property ' MSIE ' of undefined error resolution Recently upgraded a project jquery to the latest version and found that some pages reported the following error Cannot read property ' Msie ' of undefined On th

today, when I was doing angular's project, Because need to use ui-select2 so introduced Bootstrap.js, and then bootstrap.js need jquery1.9 version above, so simply replaced a 2 version, the result of dialog failure not to say, also appeared cannot read Property ' Msie ' of undefined error, so in the online check for a reason, probably upgrade to JQ2 version of th

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-jquery-tools said that after jquerry1.9, the browser attribute has been removed. On the Jquerr

Recently, a project of jquery upgraded to the latest version, found some pages error cannot read property ' Msie ' of undefined. On the jquery site search, the reason is $.browser this API from the beginning of jQuery1.9 formally abolished, JS code as long as the use of $.browser will report this error. See the official jquery note for details.The landlord by the

Express app configuration error when using MongoDB! "Cannot read property ' Store ' of undefined"The main reason is the Express version 4++ problemSettings.jsmodule.exports={Cookiesecret: "xxxx",DB: "DBName",Host: "LocalHost",}App.jsvar express = require ("Express");var settings = require ("./settings");To load Connect-mongo error notation:var mongostore=require

Error:Workaround:2.0 has no map, use NPM install [email protected] command compatible with version 1.0 vueHowever, an error occurs after installation: cannot read property ' component ' of undefinedSee a workaround:npm Install [email protected]; can solve the problem.But I did, or cannot read property ' component ' of

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

Vonic encountered such a problem, always prompted me undefined, but clearly there is a definitionvar tab={ message:{number :', title:' }} var id= {Template: ' #id ' It was later found that var self = this; Problem, the result is removed and normal, or the tab is removed can be returned to normal, the feeling is that self gets the This is not the same, some self contains tab, some contain tab properties,Here's a quick look at the

When we introduced the map,ECHARTS2 Error:Uncaught Error: [Module_miss] "Echarts/src/util/mapdata/params" is not exists!The reason is unclear, but the feeling and the lack of JS file (because ECHARTS3 error is due to lack of world.js)ECHARTS3 Error:Uncaught Typeerror:cannot Read Property ' features ' of undefinedThe reason for this is: missing World.js, then success:The code to complete the above functions

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-read-

When manipulating an object in function (obj) {}, suddenly encountered "cannot read property ' DefaultView ' of undefined" JS Error!Print out obj to find the problem, when the JS function passes the Jquary object of the parent class, this passes the parent class HTML object. When this is called in the B function object, you need to copy this to a var thisobj=this

Using Ztree when not using the default 1.4 version of jquery, error cannot read property ' Msie ' of undefined　　$.browser This API from the beginning of jQuery1.9 formally abolished, JS code used to $.browser will report this error. See the official note for more information　　Workaround Add the following code before the jquery file is loaded, using the $.browser

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 property ' concat ' of

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.com/acdlite/redux-router/issues/281Reactjs un

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})}

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.methods) {Value = $element. Data ("rule-" + metho

'}]});Modify the correct code: Ext.define (' WEB.view.stage.slide.SlideGridView ', {extend: ' Ext.grid.Panel ', alias: ' Widget.slidegridview ', Initcomponent:function () {ext.apply (this,{striperows:true, Loadmask:true, SelType: ' Checkboxmodel ', ColumnLines: True, store: ' Slidestore ', columns:[ext.create (' Ext.grid.RowNumberer ', {text: ' ordinal ', width:40,align: ' Center '}), {sort Able:false, width:250, align: ' left ', dataindex: ' Bgimgurl ', text: ' Background image '},{sortable:fa