- Javascript css html game codepen how to#
- Javascript css html game codepen code#
- Javascript css html game codepen download#
It’s incredible to see how far web standards have come (and what’s coming).
People used Flash because it could do things that HTML, CSS, and JavaScript couldn’t do at the time. In July 2017, Adobe officially announced it would stop working on Flash by 2020. In 2015, Google moved all its YouTube videos to HTML5. Amongst other things, this had a detrimental affect on SEO and accessibility. Browsers found it difficult to go into the SWF to read content.
Javascript css html game codepen download#
First, the browser didn’t natively support Flash, so you had to download the Flash plugin. By viewing the source of a website, you’d often see very little HTML and an embedded SWF file. Here are some of the groundbreaking things Flash could do back then, and how we can go about doing them today.īack in the 2000s, it was commonplace to see websites that were built using Flash. The next step would be to implement this on your website and make changes as you see fit.Flash was one of the reasons a lot of folks started building websites. I hope you have found this article helpful and are able to implement a Back To Top Button and a Page Progress Bar on your website.ĭo reach out to me on Twitter if you want to ask me anything. This is multiplied by 100 to get the value in percentage that we use to determine the width of the div, that is the progress on our progress bar. This is the height of the view required to fit in all the content.Īt last, the scrollTop value is divided by the difference of scrollHeight and clientHeight and we get a decimal value of the amount scrolled. The line with the arrows represents the scrollHeight and shows that this line continues in both directions. Here, the line without the arrows represents the clientHeight which is the height of the content visible to us. I have put together this diagram to explain it better: Screenshot explaining clientHeight and scrollHeight The clientHeight is subtracted from the scrollHeight because if we don't do that, the area visible will be taken into account as well so we would never hit 100% scrolled. ScrollHeight ( MDN Reference) is the minimum height required to fit in all its children in the element it is being called upon.Īnd finally, clientHeight ( MDN Reference) is the inner height of the element it is being called upon. The scrollTop ( MDN Reference) property is the number of pixels scrolled as mentioned earlier.
Javascript css html game codepen how to#
This is how our progress bar should look like when scrolled: Page Scroll Progress Bar on Scroll How to calculate the percentage scrolledĬalculating percentage scrolled is actually quite simple. Note that we are using our existing document scroll event listener function.
Javascript css html game codepen code#
Here is the CodePen of what we are going to build (scroll to see the magic): Back To Top Button and Page Progress bar with HTML, CSS and JS CodePen How to Make a Back to Top Button for Your Websiteįirst of all, I am going to make the body of the website huge so that it can be scrolled: body ) Code to calculate scroll percentage and set progress bar maps The only requirement is that the website should have enough content (or a big enough body height) to be scrollable, or else it will not make sense to add this. Note that you can add this to any website, whether it's an existing one or something you have just started working on. We are also going to look at how to add a page progress bar, one at the top which will increase in progress as we scroll down and decrease as we scroll up. This is a great feature to have on any website, and today we are going to see how to build it with nothing but HTML, CSS, and JavaScript. Clicking on that button takes you back to the top of the page. You've probably seen a "back-to-top" button at the bottom-right corner on many websites when you're scrolling around.
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