I stumbled upon some code that looked off to me: If some somePromise() fails, would this not get caught, and the app would crash? Does this try-catch even do anything? Should be this, correct?: Answer TL;DR – If a function that returns a promise throws an exception before returning the promise then that…
Tag: javascript
Having trouble making an image disappear when using onmouseover event on a button
I’m having trouble making an image disappear while using an onmouseover event not on it, but on a button element. I need it to appear while onmouseover and disappear while not onmouseover. Heres my code: This is the javascript to make it appear on mouseover, and the html is The onmouseout for all of the…
How to get chart from data points (arrays) with inconsistent time intervals and chart.js?
I would like to display time based line charts with chart.js. The data is send via websocket as JSON: At first JSON.parse is used to get the required data. Within a loop the x- and y-values get separated. timeIntX (epoch format): valueY: Now these arrays serve as X- and Y-data for the chart. As script source …
How to append element using vue js
I have variable array of objects, one of which is contains element p in the string. And I want to append to element div.profile-description But the result is vue js return raw html to div.profile-description I want to p in the string become element in html Answer You need use the v-html directive: Alert: Dyna…
Rendering a React component using ES generator
I have a very basic implementation of a sleep function which resolves a promise after x miliseconds: I then need to render a React component in an ES6 Stateful Class Component after the sleep, but this sadly throws the error: Objects are not valid as a React child. Is there something wrong with this generator…
Trying to add a hyperlink to Google Sheets via API
I’m using the gapi.client.sheets.spreadsheets.create() method and passing in an object to create a spreadsheet with some predefined values. I’ve tried various implementations and haven’t yet succeeded in pulling it off. I’m referring to the docs here: https://developers.google.com/shee…
What is the fastest way to update the whole document (all fields) in MongoDB?
Let’s say I want to update the whole document and override all fields, except _id. What of the three methods is the best in terms of resource consumption: 1. Set the complete document as update parameter, so all fields are passed Example: 2. Calculate a delta document between the original and the update…
D3 get attributes from element
I am trying some basic d3 and i have been trying to get the attributes of each of the rect using d3 but I am not able to get anything. When i try d3.selectAll(“rect”), I get How do can i access attributes of rect by using something like d3.selectAll(“rect”).select(“part1”).…
How to link to form select option dropdowns
I have a webpage using 4 search box’s in 2 in header & 2 in the body of homepage. Both Header form & form in body of homepage are the same and query the same search page. My Question is how could I link dropdowns so that when one changes the others follow. At the moment I am using php
I am getting an “Invalid Host header” message when connecting to webpack-dev-server remotely
I am using as an environment, a Cloud9.io ubuntu VM Online IDE and I have reduced by troubleshooting this error to just running the app with Webpack dev server. I launch it with: $IP is a variable that has the host address $PORT has the port number. I am instructed to use these vars when deploying an app in C…