Q) How can I grab the source of a Javascript dynamically generated image so I can create a download button on mobile browser?

Answer:

Grabbing the Source of a Dynamically Generated Image in JavaScript**

To grab the source of a dynamically generated image in JavaScript, you can use the `href` attribute of the `` tag. However, since the image is generated dynamically, you'll need to wait for the image to be loaded before accessing its `href` attribute.

Step 1: Get the Image Element
```const imageElement = document.querySelector('img[dynamic-src]');
```
Here, `document.querySelector` is used to select the `` element that has a dynamic source. You can modify the selector to target the specific image element you want to grab.

Step 2: Wait for the Image to Load
```
imageElement.onload = function() {
// Get the image source
const.imageUrl = imageElement.src;
// Create a download button
const downloadButton = document.createElement('button');
downloadButton.textContent = 'Download Image';
downloadButton.addEventListener('click', function() {
// Create a link to download the image
const link = document.createElement('a');
link.href = imageUrl;
link.download = 'image.png';
link.click();
});
document.body.appendChild(downloadButton);
};
```
Here, we wait for the image to load using the `onload` event. Once the image is loaded, we grab its source using `imageElement.src`. We then create a download button and add an event listener to it. When the button is clicked, we create a link to download the image.

Full Code
```javascript
const imageElement = document.querySelector('img[dynamic-src]');

imageElement.onload = function() {
const imageUrl = imageElement.src;
const downloadButton = document.createElement('button');
downloadButton.textContent = 'Download Image';
downloadButton.addEventListener('click', function() {
const link = document.createElement('a');
link.href = imageUrl;
link.download = 'image.png';
link.click();
});
document.body.appendChild(downloadButton);
};
```
Tips and Variations

1. You can modify the selector in Step 1 to target the specific image element you want to grab.
2. You can use `imageElement.getAttribute('src')` instead of `imageElement.src` to get the image source.
3. You can use a library like jQuery to make the code more concise.
4.  You can add additional logic to handle errors or edge cases.