get current year in javascript

get and display the current year using javascript. a usage example would be adding the current year as a copyright to the footer of a page

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

Twitter Post Fetcher v18.0.4 - javascript twitter feed fetcher

A few queries showing how to get latest tweets and post likes using the Twitter Post Fetcher v18.0.4 script.

codemirror with auto preview window

this should auto preview html code into the preview area using code mirror

Twitter Post Fetcher Script

Uses javascript to fetch a twitter feed from a user screen name. Totally stylable alternative to using the twitter embed code. Your Welcome... 

javascript add class to element

how to add a class to an element in raw javascript I wrote a quick demo here showing how you can add a class to an element with an id on a button click

update value of element using javascript

using innerHTML to update the value of an element

javascript attach a click event to an id not using jquery

I just wanted to bind a click to a button, not using JQuery, turns out its not that hard at all. Why am i using jquery for this stuff???...

best way to write html into an existing page javascript

this probably isnt the "best way" but it is a way that works. say you want to add some elements to a page with javascript this is a method to do it.  Add an element, before including the script..

submit form with javascript

if you have a form with an id, you can submit it with the following javascript. usually this will be attached to an event or something similar like a button click.  If i run this on the demo, it..

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

add new random image with button

this appends a new random image from picsum.photos to the div with the id app

Using props with Stateless Functional Components in React

Here is an example of a Stateless Functional Component but i cant get the PropTypes working correctly in my demo, not sure what im doing wrong here, but the code seems to work in the compiler just not..

How to Access Props Using this.props in React

If you would like to access a class component prop within its self you can do this using the this keyword.

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..

How to Override Default Props in React

The following code explains how you can override the default props in react.  In this example the default of quantity is set to 0, so we can pass in quantity in the items to override its default..

How to use default props in React

If you dont want to specify props every time you use an element, you can also specify defaults for these items. This can also be useful to remember which props are needed per component. This can be a..

How to Pass an Array as Props in React

If you need to pass larger amounts of information to a component you can pass in an array rather than just a single variable. More information on the join method on the array can be found here. Here..

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. 

How to Pass Props to a Stateless Functional Component in React

Props are like properties that you can pass into a component in react. A prop would be something like this in your component.  JSX <div>  <MyProp id="1234" /></div> The..

How to Write a React Component from Scratch

Just testing my react component writing skills...

How to Render a React Class Component to the DOM

This shows how you can get react to render a component into the page or DOM. So actually getting and showing the code that you have been writing in react. 

get element by id and hide it

This example gets an element by its id and hides it by setting the css style value to display none 

get element by id with javascript

gets an element using its id using javascript

set a cookie on click and then check if the cookie is set and dont show that message again

this script shows a message, and if the message is closed it will set a cookie to not show that message again for 1 day.  The cookie in this example is set to expire in a day, so then if you com..

How to Compose React Components in React

In this code we nest the components NonCitrus and Citrus into the Fruits Component. Then nest the Fruits within the TypesOfFood component.  Also added the additional components, Vegetables, Non..

How to Use React to Render Nested Components

It can be useful to take components and render them inside other components while still making them into seperate items. This shows how you can take each component and nest it within another one and ..

How to Create a Component with Composition in React

This shows how you can compose multiple React components together. In this example we return the parent component which has within it the child component, you can add as many child components as requ..

How to Create a React Component using the ES6 class method

One way to add a react component is to use the Stateless Functional Component method, and another way is to use the ES6 extends syntax. This method seems more complex than the 1st for some reason mayb..

What is a Stateless Functional Component in React

What is a Stateless Functional Component? A stateless component is one that can recive data and render it, but it does not manage the provided data or track changes to it.  This method creates ..

How do Self-Closing JSX Tags Work?

So in JSX all the tags must be closed, other wise it can break the element. for example: <div> must have a closing </div> and also for elements like <br> and <hr> must include..

How to Define a HTML Class in JSX in React

When writing JSX you cant add classes like you would in HTML so this code would not work: JSX <div class="my-class"></div> Instead we have to use className. JSX uses camel case for a l..

How to Render HTML Elements to the DOM with React

Once you have a JSX element defined you can write it to the page with ReactDOM.render(componentToRender, targetNode),  In this example we are targeting the div with the id challenge-node. JSX ..

How to Add Comments in JSX

To put comments inside JSX, you use the syntax {/* */} to wrap around the comment text. You do actually need the curley brackets, and have to add it under the other elements for this to wor..

Create a Complex JSX Element

JSX must return a single element, so you must wrap your items in a div element you cant just return a bunch of p tags.  Define a new constant JSX that renders a div which con..

Create a Simple JSX Element

The current code uses JSX to assign a div element to the constant JSX. Replace the div with an h1 element and add the text Hello JSX! inside it.

adding react with JSX using babel

just wanted to see how JSX would work with react and babel, so this way you can write JSX and babel compiles it for use with react.  This is apparently not a good way to do things and can be qui..

using babel for react compiling in browser

this is currently just an idea, as i saw that codepen uses babel to run react i was wondering i can do the same thing here and then just write normal react script and have babel compile it.  so ..

react hello world with time and date updating

here is a react hello world with the date and time updating on setInterval 1000 miliseconds.  Again with react it has to be compiled from JSX for it to work, so i have included the original and ..

react hello world with variable name

i was just testing some of the hello world examples on the react site, and as they use JSX they cant be directly entered into your code, so you need to run a pre compiler (not sure of the exact term f..

react basic hello world

the most basic hello world using react js

video not auto playing issue in chrome and brave

i had this error the other day when i was adding an auto play video to a page. the error was: Javascript Uncaught (in promise) DOMException: play() failed because the user didn't interact with the ..

change the box-shadow of an element with javascript boxShadow

changes the box shadow of test_div using the javascript object(?) boxShadow

change the background color of an element with javascript

gets the element by its id and changes the background color style css value the following example: gets the element by its id "my_bg" changes the style.backgroundColor to #123456

change the border radius of an element with javascript only

change padding of element with javascript

change the padding of an element with javascript only

get the value from a range input field with javascript

this script will retrieve the current value from a range slider html input if you want the value to only update when the slider interaction has been stopped change the oninput to onchange then it w..

twitter json feed testing

just testing using the Twitter Post Fetcher script, seems to be working well.

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...

set active class based on url value

this will check the full url and then loop through all the a elements in #test-div when it finds a matching url it will add the class active to that button this is good for persisting active links o..

validate an email address from a form field - version 2

This javascript function will check if the email address in the text box has an @ and a . in it and return a message saying if its valid or not.  This is pretty basic as it only includes checkin..

check if a checkbox is checked with javascript

checks if the box is checked and returns true or false reusable function that can check if a checkbox is checked or not just pass it the id of the checkbox Javascript Usage check_my_box('check1');

submit a form with javascript onclick

submit a form with javascript, good if you want to submit a form with a button that is not within that form. the form will require an id

page scroll indicator research

I was wondering the other day how they do those page scroll indicators, i saw one when viewing this site: https://blog.wolfram.com/2021/03/24/the-solution-of-the-zodiac-killers-340-character-cipher..

change a select box back to its initial select value

this will reset the select box selected value back to the 1st item in its options list

select onchange

select onchange run a function this will run the check_years function when the select value is changed

add years as options to select dropdown

add the years as dropdown items between a range of years with javascript document ready js only version

set the html of an element javascript

this will set the innerhtml value of an element

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..

codemirror htmlmixed textarea

a working (hopefully) version of codemirror using the htmlmixed mode, not sure why its not doing code highlighting. Update: 5 Jul 2022, this is working now. 

install codemirror for textareas [added]

i think rather than editing all the code using just a plain textarea element it might be nice to have codemirror format them nicer https://stackoverflow.com/questions/21085170/codemirror-how-to-insta..

darkmode toggle switch with local storage to remember the last selection

Here is a darkmode toggle switch, that swaps out the body class so you can target dark-mode or light-mode on all your elements! It saves to local storage the last selection so if you come back to the..

checking the current url and then marking a link active based on that url

i want a script that can check the current page uri and then match it to a list of links to be able to add an active class that survives page reloading So here we go... 1. Get the current page url. ..

set maxHeight of element by id with javascript

sets the max height value of an element with javascript demo pending

Modern HTML5 Techniques for changing classes

play a sound every # of seconds

This plays a beep sound every # of seconds, to stop it just reload the page 4 Minutes is 240 4.5 Minutes is 270 5 Minutes is 300

country select javascript check which option is selected and show a hidden element

this shows a country dropdown and then if a selected country name is matched it will show the second part of the form for this test australia is the confirmed country

country select javascript check which option is selected

this is an example of how you can get the selected country value with javascript from a html countries dropdown

Custom JS Tabs - No Jquery or Jquery UI

hide parts of a form until the 1st item is selected

this code can be used when you just want to show the 1st field on a form then when it is selected it shows the rest of the form elements

add a class to a div with an id javascript

a one liner to add a class name to an element with a specific id, for this to run it seems to need a document ready.

hide and show elements with js using getElementById and style.display

google map with overlay data

Ever wanted to add a really slightly complex google map to your site? Working Example /* Always set the map height explicitly to define the size of the div * element that con..

validate form data using javascript to check required html elements

for use in a javascript function to submit a form var form = document.getElementById('myForm'); for(var i=0; i < form.elements.length; i++){ if(form.elements[i].value === '' && form.elements[i..

testing chartjs

Update: 30 June 2020 I checked this code, and it was broken all fixed now. The issue with the demo included on the main site is that it was trying to run the chart js before the chart library was load..

random string generator guid

a nice easy one to generate a random string. i use this one to stop items from caching or you could use it as a guid. var nocache = Math.random().toString(36).substring(2, 15) + Math.random().toStr..

using regex with replace to replace all instances of something in a string

so you have a string and you want to replace a recurring character, use this to do it: String Example: var string = "a-string-with-dashes.txt"; var string = "a-string-with-dashes.txt"; string..

show the year with js

just a simple one liner that will show the current year, so no more need for static years in html footers! var d = new Date(); document.getElementById("year").innerHTML = d.getFullYear(); Usage E..

using getElementById and innerHTML to change the html of content no jquery

this is pretty simple, but i always forget it so ill add it here document.getElementById("theid").innerHTML = "the new content"; heres how it works, add a div with an id of theid Example .. <d..

video embed no controls

embed a video, for use as a background or a slide element, or wherever you need a large video. I found that there was a bug in chrome (which is probably fixed now) that was ignoring the autoplay tag ..