Bind 'this' to a Class Method

Binding 'this' to Class Methods in React React class components allow you to define custom methods alongside managing state and props. These methods often need to access component properties li..

jqueryui date selector with examples and code with custom date formatting

Datepicker using jquery ui with current date and date formatting. as dd-mm-yy Example Date formatting with selector  

windows robocopy /? help and usage

Reference for the windows robocopy command ------------------------------------------------------------------------------- ROBOCOPY :: Robust File Copy for Windows ..

check if an item id exists in javascript

checks if 2 ids exist in one function and console logs the status here is the result in console log

Robocopy Options /? help

My usual backup command is now robocopy source destination *.* /M robocopy d:\ f:\ *.* /M Update: actually scrap that, its /E not /M, i used to use the /MIR option, but as deleting files in the des..

add a custom event trigger in jquery document ready

i saw something that said if you add an event listener at the end of the doc ready it should fire last, but i dont think this is correct as it runs everything at once. so i think this code does not wo..

jquery load wait function

load something in jquery, wait for it to load then do something else

encode url with javascript

get the current url, encode it and log the encoded result to console

Javascript Objects Notes

As javascript objects are used so often in javascript i thought i would write an overview and some notes on how they work, well how they work for me anyway. I guess how they work for me should be simi..

console dir usage

the console.dir function shows a list of the properties or the target object. Usage console.dir(variable); Result Example

how to write a javascript string over multiple lines

i remember learning this on freecodecamp while doing the ES6 training, and i could not remember exactly how to do it.  I was using the \ at the end of each line but thats really a bit annoying.&..

check url hash using javascript

What is a url hash? This is a URL Hash. You can add the # symbol on the end of a url and content after it, and this will not effect the content usually, unless the browser is intructed to do somet..

Converting PHP to Javascript for State Extraction by numeric value Australian State Names

I cant even remember when i originally wrote this php function, but now i need to have it in javascript, should not be much change to it to get it working.  The original function takes an austra..

get the value from a textarea element

gets the value from the textarea and prints it to the console of the browser rather than using innerHTML you have to use value.

javascript get content from element

gets the content from a target element with javascript using its id sets the target with the content from element 1 using its innerHTML attribute

convert characters to entities using javascript replace

takes a html string and replaces the html elements into their equivalent characters. e.g: replaces < with &lt;

loop to arr.length or array length

showing a simple loop that uses the length of the array to find the end of the loop. This just console logs each item in the array and stops the loop when it gets to the end of the array. 

get tomorrows date with javascript

Same as the get yesterdays date except with a +1 rather than a -1 let tomorrow = new Date(new Date().setDate(new Date().getDate()+1));  

get yesterdays date with javascript

This gets todays date and minuses one day from it to be ... yesterday.  let yesterday = new Date(new Date().setDate(new Date().getDate()-1));console.log(yesterday); This format is the full da..

Create Strings using Template Literals

if you use the backtick to enclose your strings you no longer have to use \n for a new line.  For example: `this is a multiline ...string!!` Console Example

Use destructuring assignment within the argument to the function half to send only max and min inside the function.

this seems like a tricky one, can be resolved with removing the stats array reference. Im not sure how it still knows to access the stats array. I dont know how that is correct as the console just lo..

Using Destructuring and the Rest Parameter to Reassign Array Elements

Use destructuring assignment with the rest parameter to perform an effective Array.prototype.slice() so that arr is a sub-array of the original array source with the firs..

Use destructuring assignment to swap the values of a and b

Use destructuring assignment to swap the values of a and b so that a receives the value stored in b, and b receives the value stored in a. I was havi..

How to Assign the Value of One Variable to Another in Javascript

Showing a very basic script that assigns the value of the variable a to b and then console log's the object.

Console Tips and Tricks

Here are some quick commands for the console. Getting to the console in your browser Press F12 and Find the console tab. That little blue > there is the console. this is in brave or chrome, bu..

youtube search api request function

This function requests a search from the youtube search api, and searches the text in the snippet for the seearch string. You can get your own API key for this from the google developers console. They..

javascript random string to put on url for cache

I was having a bit of a cache issue with a external css file, so i thought i might fix this by appending a random query string to the file name. This should force the browser to recheck the file each ..

javascript try catch example function

try catch is a good way to stop errors breaking your javascript. here is the example from the firefox mozilla with a basic try catch logging the error to your console, rather than just breaking all t..

load json data url or api with javascript

this loads a target json url or api using raw javascript so no jquery required with this one then logs the data returned to the console. 

load json data url with jquery

loads a api or json url or endpoint using jquery and console logs the result Tested working on my test json file, check the console and it should be there. 

validate email address from string with jquery working function

Here is a working example of this post validate email address from string. This has very basic checking of an email address by checking that the string has an @ and a . in it. Note: this is still no..

How to Use PropTypes to Define Props in React

React allows you to define the types of props given to your components to make sure that invalid data is not sent as the prop to the element.  To do this you can define propTypes. You can defin..

log the console log output to a div

I do a lot of console logging so i thought it would be nice to be able to see this on my test pages. Apparently you can grab this quite easily with the following code.  I had to modify this a b..

javascript basic test array and loop

Here is just a basic test array and a loop to show a basic loop through the test array.  With the loop i use the length of the array as the max variable, so the loop stops when it hits the array..

how to join an array in javascript using the join method

This example shows how we can join an array into a string using the join method. Its a nice quick way to convert your array into a string with a delimiter such as , or ; Here we can see the test arr..

show the current date in javascript

Returns the current date and time and sets the value in a div.  Also added a demo with setinterval to update the time and date in the div every second. 

get element by id with javascript

gets an element using its id using javascript

foundation base html template - foundation template

just a basic html template with foundation and the required javascripts, good for a starter html page using foundation framework.

console table rather than console log for javascript objects and arrays

so i just saw on a tweet, that you can use console.table and i cant wait to try it out! good thing i already have a test object and array ready to go!  

adding a new line in javascript

i was writing a function where i needed to for ease of readability add a new line to the code, you can do this with the \n for the new line and then if you need the string to go to the next line then ..

javascript update item in object

find something in a javascript array by its array id and then update the value of that item i changed this from an array to an object as i wanted to use something other than numbers for the index Ob..

test php bundle write

just testing

old browser check with javascript

modified from this script i console logged all the items available so you can do what you need with them these are the avilable variables Javascript console.log(browser.agent);console.log(browser...

check browser version and show a message

a button that displays your browser version in a modal Demo (gif)

using clamp js to clamp lines of text

there is a css version of this as well but this version works in a greater range of browsers (i think) this one is not working for me... i think the overflow elipsis is still a better option than thi..

jquery check if a sub element exists

this can be done with .length

show the browsers name in javascript

This function will show you an alert box with the name of your browser, however im using brave at the moment and it shows as Netscape, so i guess you cant trust the result.  Also i just discover..

loop through a complex object json javascript

just a note to say that a complex object is an object with more than one nested object in it for example just kinda playing around with this one to get the handle on objects and how to access them C..

load json with vanilla javascript no jquery

this basically does the same thing that a jquery .getJSON does but without the need for jquery.

json load from jquery and loop through the results

this is the same as this post but i have added the object to an external test file. so rather than already having the object data on the page we have to load it somehow Note: you can test that the o..

check box highlight text area css

i just wanted to be able to highlight a text field if a certain check box was checked on a form in this demo below, if you click on the check1 checkbox it will give you an alert saying if the box is ..

javascript page redirect

this one i cant add a working demo for, due to its nature, but it is working if you remove the comment. combine this with this: https://kruxor.com/view/code/wQUDM/do-something-later-with-settimeout-..

using moment.js to make your time format nicer

moment.js is a very nice way to handle multiple date strings and output them in a nicer format.  grab the latest copy of momen from cdnjs lets say our date is in this format, i think this is un..

loop through object json javascript

this shows how you can loop through a javascript object using for if you check the console you can see the loop results

add click event to multiple link items and load the link content into a target div ajax

this will get a group of links with existing href targets and load them dynamically with an ajax callback you will need to also include the full jquery script as the slim one does not include the aja..

get the value of an input form element (input value)

add how to get the value of an input form element with javascript for some reason i can get this working with: Javascript console.log(document.getElementById("my_input").value); but when trying to..

minutes to decimal calculator javascript version

trying to do a more simple version of this post. https://kruxor.com/view/code/NIjAQ/quick-tool-to-convert-time-into-decimal/  the php version requires post back to the server, so i think this c..

check if a query string item is set in the current url

this will check and console log if a query string on this page is set to test=anything example url is:  Test is not set: https://kruxor.com/view/code/XzLaT/  Test is set using & : htt..

Adding HTML Templates into TinyMCE Editor

This can be very useful if you are using the tinymce editor on your site and want to be able to add simple or complex html templates. Here is how to do it: Add this to your tinymce init Javascrip..

Testing

test <p>test</p> x .my-selector{ value:1px;} HTML <table></table> CSS .css{} Javascript function test() { console.log('test'); } PHP a = 1; x x

Fix Hover Over color on list group dark mode in bootstrap

How to fix the problem when switching to dark mode, the list group item text disappears when active. Here is what it currently looks like. To fix this we need to target the element and force the..

fix for Uncaught (in promise) Error: reCAPTCHA placeholder element must be empty

This is usually caused by something being inside the element used to render the reCAPTCHA. In this case tinymce was adding a &nbsp; or a <p> tag to the element Removed the space and this f..

javascript window.onload

wait for the window to load and then run a function

matches the url and does something if it matches a certain string

javascript isset equivalent

i was just looking for an equivalent to the isset in php for javascript, i was initially using .length but this can still cause errors so i found this solution. if (typeof my_var !== 'undefined') {}

using let rather than var

Using let rather than var and use strict can avoid some overwriting of variables i will write a function here that shows how let throws an error. This function now gives an error in the console. Uncau..

for loop through an array with javascript

looping through an array with javascript using a basic for loop

basic for loop odd numbers

a basic for loop with odd numbers adding to an array

check if something is an array

this function will check if something is an array

getType function for js

this function returns the type of item, array object string number etc

Objects in javascript

creating and using an object in javascript, the full version of this testing is on codepen

card counting example from fcc

here is a solved version of the card counting function from free code camp you can test it using console log.

using switch with multiple identical cases

this can be used if you have several outcomes where the return value will be the same by omitting the break from the cases before the final

using switch in a function

This shows an example using the switch to select multiple options in a function, you can return from the switch with break, or you can end the whole function with return.

JS Using typeof to check on string types

you can use the typeof operator to check what kind of variables you have.

add something to the start of an array with unshift

unshift is the opposite of push where push adds to the end of an array unshift will add to the start of the array.

remove the first element in an array with shift

like pop but shift does the 1st element in an array

using local storage rather than cookies to store data (localStorage)

you can see what is stored in local storage by typing this into your browser console. localStorage Adding something You can add something to local storage by using the setItem function.

remove something from the end of an array with pop

pop is the opposite of push and will remove the last item in an array, it also returns the value so you can assign it to a variable

add something to the end of an array with push

you can easily add to the end of a javascript array with the .push function.

Multidimensional Array

sounds complex, but it's not really here is an example of a Multidimensional Array in javascript. It's just one array nested in another.

get the last letter of a string

you can use the .length and the index of a string to get its last value

accessing part of a variable using its index

you can access part of a string variable using its index[1]

js check the length of a string

using the javascript .length property

round number with js

Round a number to two decimal places. code var rounded = Math.round(num * 100) / 100; demo Result... function round_val() { var val = $("#rval").val(); var rounded = Math.r..

truncate string using jquery

.test { padding:10px;border:1px solid #999;border-radius: 3px; } so lets say we had the following string on the page and we needed to make it a bit shorter for some reason. like if you dont have co..

detect window scroll position jquery

This one adds or removes a class if the document is scrolled 50 px near the top of the window. $(window).scroll(function() { if ($(document).scrollTop() > 50) { $('nav').addClass('shrink');..

load google sheet data into json string with jquery

Just discovered this the other day, you can actually export google sheets data into json format and load it directly into your site, how good is that. A free mini basic database! Initially i was lo..

do something later with settimeout or loop with setinterval

setTimeout This one will run a certain time after the document loads. So if i want to execute something 5 seconds (or so) after the page loads i would do this. You will need to check your console..

json loop load elements

Loading json content from a url can be tricky, there are a few different things you need to watch out for. Here is some examples using an example json feed. Load the feed this will load the feed and..

access hacker news json firebase api via jquery

Just a getJSON JQuery Request that will console log all of the hacker news top stories using the firebase api $.getJSON('https://hacker-news.firebaseio.com/v0/topstories.json', function(json) { va..

check length of element jquery

this one can be good for checking if an element exists before doing something with it and can stop warning messages if you are running the script on multiple pages. if ($('#mydivid').length) { con..

find all elements add class jquery

this will grab all a elements, and dump them to the console. var allLinkElements = $( "a" ); console.log(allLinkElements); then we need to split into a jquery object, this is a jquery version of an..