I have the following userscript I run on Greasemonkey/Tampermonkey. I run it on facebook.com which serves some of the webpages from backend, in bootstrapping, and some others on the fly, in front-end, via HRO, just as a Single Page Application (SPA) would. If I run this script on console, even in HRO based we…
Tag: javascript
Intercept fetch() API requests and responses in JavaScript
I want to intercept fetch API requests and responses in JavaScript. For example, before sending the request I want to intercept the request URL. I’d like to intercept the response once it arrives as well. The below code is for intercepting responses of all XMLHTTPRequests. I want to implement the same f…
undefined is not an object (evaluating ‘this.props.navigation.navigate’) – React Native
I am trying to make my first React Native Android app and I am getting this error: undefined is not an object (evaluating ‘this.props.navigation.navigate’) This is the code: I can not figure out why the error is coming. Answer You are exporting the component wrong. You should get rid of the export…
Convert if statements into ternary conditional operators
Apologize if it’s seems simple, I’m stack on this. I want to convert these if statements into ternary condition : I tried this and do not work for me, it only execute directly condition C How to formulate that ? thanks. Answer Though with some magic letters it works. But please DON’T do it. …
Regex pattern for Malaysian mobile phone Number
Regex pattern ^(+?6?01)[0|1|2|3|4|6|7|8|9]-*[0-9]{7,8}$ in HTML5 input return error. I tested the regex, no errors on regex101.com as well as in my php code. But in HTML5 it does not function as it be. My code: Error: textfield.js:146 Pattern attribute value ^(+?6?01)[0|1|2|3|4|6|7|8|9]-*[0-9]{7,8}$ is not a …
How to customize arrow buttons in Swiper
How can I customize the arrow buttons below from swipers? I did it crudely but it does not seem to be the right way because I get some margin on the right of the button. The entire code: I don’t want the margin. Any ideas? EDIT: How do I change the colour blue on the arrow to black? Does not
Vue.js : Passing an external variable to a component through initialization?
I am trying to pass a variable (here, externalVar) to a component, directly when initializing. But I can’t find how to do it (probably not understanding documentation well :/ ). What is the correct way to do it? The initialization : The component I am initializing here is defined like this (getting back…
How to zoom a three.js scene with the mouse wheel?
I have a simple three.js graphics, and I tried to use the answers in this and this question to make the created plot zoomable by the mouse wheel. By using the mouse wheel I would like to zoom in to the graphics or to zoom out. Here is the complete code: pastebin link However, when turning the mouse wheel noth…
Using await within a Promise
There seems something inherently wrong with having to define a Promise’s callback as asynchronous: This is apparently an antipattern and there are coding problems which can arise from it. I understand that it becomes easier to fail to catch errors here, even when placing await statements inside try/catc…
Javascript Equivalent to C# LINQ GroupBy
This is a follow up question to the following question: Javascript Equivalent to C# LINQ Select We are using Angular 2 + TypeScript: I have an Array of objects. Each object in the array include a property called ‘StudentType’. I need to run a C# LINQ style query that extract a list of StudentType …