I’m accessing an API with ReactJS. What is the best way to stop React Component crashing when it’s accessing a property in the object provided by the API that may be ‘undefined’? An example of an error is: TypeError: Cannot read property ‘items’ of undefined Answer It looks…
Tag: javascript
How to Disable back swipe option or pop a route in React Navigation?
I have a Login Page(StackNavigator) and a Tabbed pages(TabNavigator). After logging the user in there is still a possibility for the user to go back(to Login Page) by swiping back. What is the way of popping the login route from the Route Stack or disabling the back swipe option. Thanks Answer Dispatch a rese…
Use Chrome Extension API within Vue.js Component
I’m trying to access the local storage of the chrome extension ergo the chrome browser within my vue.js component. ServerList.vue This code is within my popup.html and this is what the console of the popup.html inspection tells me this: Therefore I assumed it did work. But when I check the local storage…
Does ES6 import/export need “.js” extension?
I installed chrome beta – Version 60.0.3112.24 (Official Build) beta (64-bit) In chrome://flags/ I enabled ‘Experimental Web Platform features’ (see https://jakearchibald.com/2017/es-modules-in-browsers) I then tried: where index.js has a line like: This refer to an existing file drawImage.j…
VueJS pass all props to child component
I am quite new to VueJS. In react you can easily use rest params for passing props to children. Is there a similar pattern in Vue? Consider this parent component that has a few children components: What I don’t like is that the props are named-spaced with the key config, or any other arbitrary key. The …
document.getElementById giving Null by JS not by HTML
When I am defining my input tag in html and accessing in JS by id then I am getting my tag. HTML Code: JS Code: Here things are fine. But When I am creating from javascript and trying to access I am getting. I want dynamic So I need to create from JS. JS Code: Here I am getting null
Enums in Javascript with ES6
I’m rebuilding an old Java project in Javascript, and realized that there’s no good way to do enums in JS. The best I can come up with is: The const keeps Colors from being reassigned, and freezing it prevents mutating the keys and values. I’m using Symbols so that Colors.RED is not equal to…
React JS Error: is not defined react/jsx-no-undef
I’m developing a map functionality using ReactJS, My app.js file is: The error is: How can I solve this problem? Answer Try using When you use import ‘module’ it will just run the module as a script. This is useful when you are trying to introduce side-effects into global namespace, e. g. po…
@Input() issues
I’m trying to get data from a variable from another component, but so far it hasn’t been working. The idea is that when I check a checkbox, the variables (Booleans) become true and some things on my page are visible and vice versa. So basically I want the variables from InstellingenComponent to wo…
jqplot not show label end points
when I draw chart using jqplot, both end point of the chart does not show label, and I am not sure why. Please help Here is my code (self-contained code, with all resources loaded) Answer I have this issue before but my X-Axis values was numbers and fixed it by adding ratio (Adjustment) about 20% from the max…