Crop image javascript code


  • PHP Crop and Resize Image Before Upload & Save
  • An in-depth look at cropping images in CSS
  • How to crop an image using canvas ?
  • Crop Image Before Upload in Laravel 8
  • How to Crop Image using jQuery and PHP
  • How To Crop Images In Javacsript (Simple Examples)
  • Laravel 8 Crop Image Before Upload using Cropper JS
  • PHP Crop and Resize Image Before Upload & Save

    In a real world example a website or app might use a technique like this to resize and frame a profile picture before uploading. Whilst we could do this on the server, it would require the transfer of a potentially large file, which is slow.

    Instead we can resize the image on the client side before uploading it, which is fast. Most browsers have good support for these methods, so you can probably use this technique right now, however just be aware of some limitations unrelated to browser support such as quality and performance.

    Resizing very large images can cause the browser to slow down or in some cases, even crash. It makes sense to set reasonable limits on the file size just as you would when uploading a file. If quality is important you may find the resized image looks undesirable due to how the browser resampled it. There are some techniques to improve the quality of images downscaled with canvas , but they are not covered in this tutorial.

    Take a look at the final result in this demo or download the ZIP file. First, define the styles for the resize-container and the image. These are the little squares at each corner of the image that we drag to resize. This function wraps the image with a container, creates resize handles and makes a copy of the original image used for resizing. We also assign the jQuery object for the container element to a variable so we can refer to it later and add a mousedown event listener to detect when someone begins dragging one of the handles.

    This function is constantly invoked while the user is dragging one of the resize handles. Every time this function is called we work out the new width and height by taking the current position of the mouse relative to the initial position of the corner we are dragging.

    Finally, we resize the image, but only if the new width and height are not outside the bounds of the min and max variables we initially set. This is called debouncing or throttling.

    Actually resizing the image Drawing an image to the Canvas is as easy as drawImage. We set the height and width of the canvas first and always use the original copy of the full-sized image. We then use toDataURL on the Canvas to get a Baseencoded version of the newly resized image and place this on the page. There is a full explanation for all the parameters that can be used with the drawImage method in the cropping section of this tutorial. There is one small proviso: the image must be on the same domain as the page or on a server with cross-origin resource sharing CORS enabled.

    Resizing from different corners You should now have a working demo. At the moment, no matter which corner of the image we resize, it behaves as though we are resizing it from the bottom right.

    We want to be able to resize the image from any corner. To do this we need to understand how it should behave. When we change the width and height of an image, the right and bottom edges move, while the top and left edges will stay the same. This means that by default, an image is resized from its bottom right corner. Moving the image Now that we can resize the image from any of its corners you might have noticed we can inadvertently change its position on the page.

    We need to give users the ability to move the image back into the center of frame. This will be equal to the current position of the mouse, offset by the distance the mouse was from the top left corner when we started dragging the image.

    This gives them control over the zoom and framing, yet ensures the final image always the same size and shape. That is why I used a semi transparent white outline around the main box in my example. For cropping, the canvas drawImage method requires nine parameters. The first parameter is the source image.

    The next four parameters indicate what part of the source image is used the clipping box. The final four parameters indicate where on the canvas to start drawing the image and at what size. For mousedown and mouseup there are equivalent touch events, touchstart and touchend and for mousemove there is the equivalent touchmove. There is a library called Hammer that provides a lot of convenience when working with gestures.

    But since we only need pinch zoom, in our case, it might be a more like a sledge hammer. Let me show you how easy it is to detect pinch zoom without any library. You might have notice that in the saveEventState function we already stored the initial touch data; this will come in handy now. We note this as the initial distance and then constantly measure how much this distance changes while moving.

    We work out the new width and height and then resize the image. Take a look at the demo or download the ZIP file. I hope you found this tutorial useful. I suggest further reading on drag and drop and file upload techniques and look forward to see how people might combine these techniques to create some beautiful user interfaces.

    An in-depth look at cropping images in CSS

    By Jake Rocheleau May. And you can build most of that stuff with plugins to save yourself the trouble of coding from scratch. One of the toughest features to build is an image cropping UI. This has to support image uploading from the user, then it has to take that image into the frontend and let the user perfect their crop.

    After that it passes image crop data to the backend so the image can be cropped and saved. Save yourself the trouble and use one of these free plugins to offload the heavy lifting… 1. Cropper Cropper is currently in v4. This runs entirely on jQuery but there is a non-jQuery version too. Both versions are identical other than syntax and they have some of the best features around for image cropping with a laundry list of options and methods.

    When hovering over the uploaded image you can scroll in and out using your mouse wheel to zoom. This also supports pinching and touch-based input devices. Not to mention you can add custom tools with the Cropper API.

    These tools let visitors automatically rotate, zoom, and force-crop certain aspect ratios onto their uploads. Cropper is just a great plugin hands down. Croppie Another viable option is Croppie.

    Good news for minimalist developers. It does support npm and Bower if you want to run this through a package manager. Or you can download the source right from GitHub if you fancy that instead. With Croppie you simply target the crop window element and define the image can be updated dynamically. And there are tons of options you can call inside the Croppie function to handle customizations, callback methods, and so much more.

    Although it does have some not-so-simple features. For example you can add zooming functionality into the UI to let users get a closer look at their photos before cropping. All code is naturally available for free and the code itself is pretty small less than 3KB all together. Croppic The cleverly-named Croppic plugin is one more free jQuery alternative.

    It can handle all your basic image cropping, dragging, zooming, stuff like that. But it stands out because of its many additional features, one of which can automatically handle image uploads right from your browser.

    That feature does require a web server and a backend language PHP is preferred. A fantastic way to handle Ajax image uploads with class. But I find Croppic easier to use with more UI customizations like modal windows.

    How cool is that? The React Drag and Drop plugin is a combo of two different scripts. This uses the dropzone library to handle image uploads along with the React Cropper as an image cropping React component. That whole demo is dynamic too so you can follow along with each action as it occurs in real time.

    Tinycrop Tinycrop is exactly what the name sounds like. On the contrary, Tinycrop is the perfect choice for developers concerned with bloated pages and slow HTTP requests. You can find setup directions on the GitHub page along with a full code snippet demonstrating all the options available.

    Jcrop The Jcrop plugin has been around for quite a while being one of the first jQuery image cropping tools on the web. Still, this script works very well for handling image uploads via PHP.

    Have a look at the demo page to see how this works. You can see each original photo, the suggested crop based on the Smartcrop algo, and the finished crop afterwards. All you have to do is get the plugin setup, add the initial function to run on the page, and then just upload some images.

    Jake is a writer and user experience designer on the web. Find out more on his website or you can follow his updates on Twitter jakerocheleau More articles by Jake Rocheleau Popular posts.

    How to crop an image using canvas ?

    This has to support image uploading from the user, then it has to take that image into the frontend and let the user perfect their crop. After that it passes image crop data to the backend so the image can be cropped and saved. Save yourself the trouble and use one of these free plugins to offload the heavy lifting… 1. Cropper Cropper is currently in v4.

    This runs entirely on jQuery but there is a non-jQuery version too. Both versions are identical other than syntax and they have some of the best features around for image cropping with a laundry list of options and methods. When hovering over the uploaded image you can scroll in and out using your mouse wheel to zoom.

    Crop Image Before Upload in Laravel 8

    This also supports pinching and touch-based input devices. Not to mention you can add custom tools with the Cropper API. These tools let visitors automatically rotate, zoom, and force-crop certain aspect ratios onto their uploads. Cropper is just a great plugin hands down. Croppie Another viable option is Croppie. Good news for minimalist developers. It does support npm and Bower if you want to run this through a package manager. Or you can download the source right from GitHub if you fancy that instead.

    With Croppie you simply target the crop window element and define the image can be updated dynamically. And there are tons of options you can call inside the Croppie function to handle customizations, callback methods, and so much more.

    Although it does have some not-so-simple features. For example you can add zooming functionality into the UI to let users get a closer look at their photos before cropping.

    How to Crop Image using jQuery and PHP

    All code is naturally available for free and the code itself is pretty small less than 3KB all together. Croppic The cleverly-named Croppic plugin is one more free jQuery alternative. Croppie It is for easily implement image cropping functionality, as well as other user interfaces UI features.

    Orientation, zoom, zoom view and dragging functions most smoothly with crappie then the others in the list. Thus best for one who needs to view results while working.

    Download Demo 3. DarkroomJS Darkroom is a robust jQuery image cropper plug-in that allows buttons to add-in the toolbar and bound with existing features. And it is a highly customizable image cropping tool for your web application that uses the power of the HTML5 canvas.

    Here, each plug-in is responsible for creating its own functionality.

    How To Crop Images In Javacsript (Simple Examples)

    Download Demo 4. It basically creates a viewport around a given image allowing drag, view the result and resize in the best manner. Furthermore, this simple and easy plug-in with advanced functionality is best for image hosting. Source 5. Jcrop — jQuery Image Cropping Plug-in This one is at the simple and lightest form, best just for smooth dragging. While no event handlers, this is quite boring.

    Laravel 8 Crop Image Before Upload using Cropper JS

    Just attach any image on your page with simple codes and instantly start cropping. Demo and Code 6. Picture Cut Picture Cut has a beautiful interface based on bootstrap or jquery ui. Also, it includes great features like ajax upload, image crop, drag image from explorer and many such.


    Crop image javascript code