Sending print statements to the console is very common in Python coding. It is simply a matter of using the key word print, followed by what you want printed to the screen. For example: # variables year = ‘2015’ xldate = 41000 pvid_list = [“19615056”, “15612770”, “15612771”] # print a raw string print “Print this … Continue reading Python: How to use the logging module
Windows Command Line: How to create a directory listing
This article details how to create a plain text directory listing on Windows, using the Windows command prompt. To open a Windows command prompt in Windows 10, simply type “cmd” in the Windows search bar. Once the Command Prompt is open, use the ‘cd’ command to change to the directory you want to get a … Continue reading Windows Command Line: How to create a directory listing
How to move WordPress to a new host
Once I got the new domain name bluegalaxy.info, I wanted to move my blog over to the new domain. It was previously hosted on my laptop with a local apache installation at: http://1uslchriston.ad.here.com:8080/blog On the new domain, I wanted to change the landing from “blog” to “codewalk”, and I also don’t need to use port … Continue reading How to move WordPress to a new host
React: A component render can return only one element!
A component render can return only one element, so if you want more complicated HTML output from your component’s render, it needs to be returned in a single div. In other words, every component can return only a single div. This applies to ReactDOM.render also. So if I want to render a Movie component three … Continue reading React: A component render can return only one element!
React: How to call a parent function from a child function and/or pass data to the parent function
In a continuation of the theme of how to pass information around in react, this article details how to call a parent function from a child function. This previous article details how to pass state from parent to child: React: How to pass state information from parent to child Allowing a child function to call … Continue reading React: How to call a parent function from a child function and/or pass data to the parent function
React: How to pass state information from parent to child
In a react script, to pass state information from a parent component to a child component, the state information needs to be passed as a prop. For example: numturns={this.state.number_of_turns} Now, “numturns” can be used as a prop in the child. For example, inside the child handleclick function: console.log(“Child communication, number of turns from parent: “, … Continue reading React: How to pass state information from parent to child
MySQL: How to run multiple queries in one
Let’s say we have a couple of simple SQL queries, one of which counts the total number of job hours: select sum(Hours) as totalCount from job_details where Job_ID = 42504; and another query that sums the total number of job hours that have been completed: select sum(Hours) as completedCount from job_details where Job_ID = 42504 … Continue reading MySQL: How to run multiple queries in one
React: Using .bind(this) on parent and child components
In a react script, for every function in both the parent and child components we must have this magic line using .bind(this)in the constructors: this.nameOfFunction = this.nameOfFunction.bind(this); For example: // Parent with a incrementNumberTurns() function: this.incrementNumberTurns = this.incrementNumberTurns.bind(this); // Child with a handleClick() function: this.handleClick = this.handleClick.bind(this) Here is an example from the parent component … Continue reading React: Using .bind(this) on parent and child components
jQuery: How to scroll to a div
When you first land on a page, it is possible to have the page scroll down to some remote div further down the page, using a little bit of jQuery. For example, if the remote div is called “remoteDiv”, this jQuery will automatically scroll down to the div when the page loads: $(“.remoteDiv”).ready(function() { $(‘html,body’).animate({ … Continue reading jQuery: How to scroll to a div
HTML & CSS: How to change text color based on background color
Let’s say we have a progress bar with some text in it and the background is a light color. We want the font to be dark enough to contrast with the light background. Then as the progress bar or meter fills up with a darker color, we want the font color to adjust (lighter font … Continue reading HTML & CSS: How to change text color based on background color