momvur.blogg.se - Download image javascript

Let btnDownload = document.querySelector('button') As soon as this function executes, our image downloading will start. We are simply calling saveAs() method of FileSaver.js and passing it imagePath and fileName as parameters.We are storing the name of the image in the fileName variable.

We have created the getFileName() method which will take a string as a parameter and will return the name of the file along with its extension.

We are getting the source of the image by calling the getAttribute() method with src string as a parameter on the img element and storing it in the imagePath variable.

We have attached the click event listener to the button element.

We have selected two elements button and img using the document.querySelector() method and stored them in btnDownload and img variables respectively.

We have also included our javascript file script.js with a script tag at the bottom.

We have included with a script and that will take care of downloading part.

We have done some basic styling using CSS and added the link to our style.css stylesheet inside the head element.You can change it to a different URL of your choice. We are using an external image as a source with an img tag.The inner text for the button element is “Download”.The div element is just a wrapper for the rest of the elements. We have 3 elements in the HTML file ( div, button, and img).Another advantage is that you don't need to load every image individually, which can improve load performance. For instance, if you want to make a chart you could have a PNG image containing all the necessary text in a single file and depending on your data could change the scale of your chart fairly easily. You could have all elements in a single image file and use this method to composite a complete drawing. Slicing can be a useful tool when you want to make compositions. The last four parameters define the rectangle into which to draw the image on the destination canvas. The first four parameters define the location and size of the slice on the source image. To really understand what this does, it may help to look at this image: Given an image, this function takes the area of the source image specified by the rectangle whose top-left corner is ( sx, sy) and whose width and height are sWidth and sHeight and draws it into the canvas, placing it on the canvas at ( dx, dy) and scaling it to the size specified by dWidth and dHeight.

drawImage(image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight) It lets us cut out a section of the source image, then scale and draw it on our canvas. The third and last variant of the drawImage() method has eight parameters in addition to the image source.