Planning to make web app like Canva [closed] - javascript

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I want to make app like canva but i dont know where to start, i have good experience in html and css but a basic javascript.
I need to know what they use.
How to save html data to image like canva functions.
How they save the data and load it again.
I already try Html2canvas but problem in images limit.

You should use Javascript canvas libraries like Fabricjs
but i don't think that basic knowledge of javascript would be enough for such app you will have to improve your javascript skills to an at least intermediate level.

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Creating an accelometer in CSS/Javascript [closed]

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Im working on a project where I need to visualize the G-force on a spaceship. I want to accomplish this with creating an accelometer (something like a seismogram see picture for an example)
Is is possible to create this using CSS/JavaScript?
The accelometer needs to run infinite creating random data for the G-force on the spaceship.
It sure is possible with CSS and JS.
The question is wether you want to do it that way.
If I were you I'd choose to use the HTMLCanvasElement to display the data generated by either JavaScript on the client side or the server side language of your choice on the server.

whats the fastest way to load images using javascript? [closed]

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Lets say I have an ecommerce site with 15,000 image elements to insert into the html, whats the most efficient method using javascript to increase efficiency and user experience?
Load the images only when they are in the view port.
This question tells you how:
How do you make images load only when they are in the viewport?
Preload the images and use the cdn to host your images.
You can use something like https://github.com/thinkpixellab/PxLoader to preload the images.

Is it possible to practice AJAX using the Brackets web editor with local files only? [closed]

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What I'm ultimately trying to accomplish: Making a site that allows you to browse through videos and add/remove them from an AJAX-controlled playlist. So far, my website has only been created through Brackets using local web files, and I'm curious how much I'll need to change my work environment if I want to begin using AJAX with my website. I've never used AJAX before, if that isn't obvious....
You have to use a local server like WAMP (http://www.wampserver.com/en/), MAMP(https://www.mamp.info/en/), or LAMP

Embeddable Website Viewer [closed]

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I'm trying to do something kind of like Google's embeddable pdf viewer except I want to be able to embed a website and be able to view that on my website.
Specifically because I have many different teachers and they all use something called Planbook for their assignments, so I want to be able to view all of them at once. Also, I think it would help some other students.
So, does anyone know of a way to do this?
A quick way to acheive this is to use the HTML iframe. It displays a frame of another webpage, an example usage is <iframe src="http://www.w3schools.com"></iframe>. Also see this link for some more basic info.

Use javascript to crop image [closed]

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I want to put a sprite image in my website, and use javascript to crop it to many separate images, then put these images into an image array.
Is this possible? Thanks.
Take a look at jCrop, if you're using jQuery or JavaScript Image Cropper UI if you're using prototype.
What server-side language are you using? If you just want a straight crop w/o the graphical interface it might be better to do it server side.
If you're using PHP, check out this tutorial on nettuts
If you're using Ruby on Rails, check out Paperclip

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