Download image as file in typescript

Download image as file in typescript

To download an image as a file in TypeScript, you can create a Blob (Binary Large Object) from the image data and use it to create a download link. Here's a simple example:

function downloadImage(url: string, fileName: string): void { fetch(url) .then(response => response.blob()) .then(blob => { // Create a download link const link = document.createElement('a'); link.href = window.URL.createObjectURL(blob); link.download = fileName; // Append the link to the document document.body.appendChild(link); // Trigger a click on the link to start the download link.click(); // Remove the link from the document document.body.removeChild(link); }) .catch(error => { console.error('Error downloading image:', error); }); } // Example usage const imageUrl = 'https://example.com/your-image.jpg'; const fileName = 'downloaded-image.jpg'; downloadImage(imageUrl, fileName);

In this example:

  1. The fetch function is used to retrieve the image data from the specified URL.
  2. The image data is converted into a Blob using response.blob().
  3. A download link (<a>) is created with the href attribute set to the Blob's URL and the download attribute set to the desired file name.
  4. The link is appended to the document, a click event is triggered on the link, and then the link is removed from the document.

Make sure to replace https://example.com/your-image.jpg with the actual URL of your image and specify the desired fileName.

This code will simulate a download of the image as a file named downloaded-image.jpg. Adjust it according to your specific needs.

Examples

  1. Download Image as File TypeScript:

    • Description: How to download an image as a file in TypeScript.
    • Code:
      const downloadImage = (url: string, fileName: string) => { const a = document.createElement('a'); a.href = url; a.download = fileName; a.click(); }; // Example usage const imageUrl = 'https://example.com/image.jpg'; downloadImage(imageUrl, 'downloaded_image.jpg');

  2. TypeScript Save Image from Canvas:

    • Description: Saving an image from a canvas element in TypeScript.
    • Code:
      const canvas = document.getElementById('myCanvas') as HTMLCanvasElement; const ctx = canvas.getContext('2d'); // Draw on the canvas... const imageBlob = await new Promise<Blob | null>((resolve) => canvas.toBlob(resolve, 'image/jpeg')); if (imageBlob) { const imageUrl = URL.createObjectURL(imageBlob); downloadImage(imageUrl, 'canvas_image.jpg'); }

  3. Download SVG as Image File in TypeScript:

    • Description: Downloading an SVG as an image file in TypeScript.
    • Code:
      const svgElement = document.getElementById('mySvg') as SVGSVGElement; const svgString = new XMLSerializer().serializeToString(svgElement); const imageBlob = new Blob([svgString], { type: 'image/svg+xml' }); const imageUrl = URL.createObjectURL(imageBlob); downloadImage(imageUrl, 'svg_image.svg');

  4. TypeScript Save Base64 Image as File:

    • Description: Saving a base64-encoded image as a file in TypeScript.
    • Code:
      const base64String = 'data:image/png;base64,iVBORw...'; // Base64 image data const imageBlob = await fetch(base64String).then(response => response.blob()); const imageUrl = URL.createObjectURL(imageBlob); downloadImage(imageUrl, 'base64_image.png');

  5. Download Image from URL TypeScript:

    • Description: Downloading an image directly from a URL in TypeScript.
    • Code:
      const imageUrl = 'https://example.com/image.jpg'; const response = await fetch(imageUrl); const imageBlob = await response.blob(); const imageObjectURL = URL.createObjectURL(imageBlob); downloadImage(imageObjectURL, 'downloaded_image.jpg');

  6. TypeScript Save Canvas Image with Context:

    • Description: Saving an image from a canvas using the canvas context in TypeScript.
    • Code:
      const canvas = document.getElementById('myCanvas') as HTMLCanvasElement; const ctx = canvas.getContext('2d'); // Draw on the canvas... const imageDataURL = canvas.toDataURL('image/jpeg'); const imageBlob = await fetch(imageDataURL).then(response => response.blob()); const imageUrl = URL.createObjectURL(imageBlob); downloadImage(imageUrl, 'canvas_image.jpg');

  7. TypeScript Save Image File with Fetch API:

    • Description: Saving an image file using the Fetch API in TypeScript.
    • Code:
      const imageUrl = 'https://example.com/image.jpg'; const imageBlob = await fetch(imageUrl).then(response => response.blob()); const imageUrlObject = URL.createObjectURL(imageBlob); downloadImage(imageUrlObject, 'downloaded_image.jpg');

  8. Download Canvas Image as PNG TypeScript:

    • Description: Downloading a canvas image as a PNG file in TypeScript.
    • Code:
      const canvas = document.getElementById('myCanvas') as HTMLCanvasElement; const imageDataURL = canvas.toDataURL('image/png'); const imageBlob = await fetch(imageDataURL).then(response => response.blob()); const imageUrl = URL.createObjectURL(imageBlob); downloadImage(imageUrl, 'canvas_image.png');

  9. TypeScript Save Image File with FileReader:

    • Description: Saving an image file using FileReader in TypeScript.
    • Code:
      const imageUrl = 'https://example.com/image.jpg'; const response = await fetch(imageUrl); const imageBlob = await response.blob(); const reader = new FileReader(); reader.onload = () => { const imageUrl = reader.result as string; downloadImage(imageUrl, 'downloaded_image.jpg'); }; reader.readAsDataURL(imageBlob);

  10. Download Image with XHR in TypeScript:

    • Description: Downloading an image using XMLHttpRequest (XHR) in TypeScript.
    • Code:
      const imageUrl = 'https://example.com/image.jpg'; const xhr = new XMLHttpRequest(); xhr.responseType = 'blob'; xhr.onload = () => { const imageBlob = xhr.response; const imageUrl = URL.createObjectURL(imageBlob); downloadImage(imageUrl, 'downloaded_image.jpg'); }; xhr.open('GET', imageUrl); xhr.send();

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