Category: JavaScript Answers

Sometimes, we want to force browser to download image files on click with JavaScript.

In this article, we’ll look at how to force browser to download image files on click with JavaScript.

How to force browser to download image files on click with JavaScript?

To force browser to download image files on click with JavaScript, we set the download property of the link.

For instance, we write

const link = document.createElement("a");
link.href = "images.jpg";
link.download = "Download.jpg";
document.body.appendChild(link);
link.click();
document.body.removeChild(link);

to create the link with createElement.

Then we set the download property to the file name of the downloaded file.

Finally, we call click to click on the link to download the file.

Conclusion

To force browser to download image files on click with JavaScript, we set the download property of the link.

Sometimes, we want to get a list of filenames in folder with JavaScript.

In this article, we’ll look at how to get a list of filenames in folder with JavaScript.

How to get a list of filenames in folder with JavaScript?

To get a list of filenames in folder with JavaScript, we use the Node.js fs.readdirSync method.

For instance, we write

const fs = require("fs");
const files = fs.readdirSync("/assets/photos/");

to call readdirSync with the folder path that we want to get the filenames from.

Conclusion

To get a list of filenames in folder with JavaScript, we use the Node.js fs.readdirSync method.

Sometimes, we want to remove all event listeners of a DOM object with JavaScript.

In this article, we’ll look at how to remove all event listeners of a DOM object with JavaScript.

How to remove all event listeners of a DOM object with JavaScript?

To remove all event listeners of a DOM object with JavaScript, we can get all event listener names with getEventListeners.

And then we call remove on each event listener.

For instance, we write

for (const eventType of Object.keys(getEventListeners(document))) {
  getEventListeners(document)[eventType].forEach((o) => {
    o.remove();
  });
}

to use Object.keys(getEventListeners(document)) to get an array of event listener name strings.

Then we call getEventListeners(document)[eventType].forEach with a callback that calls remove to remove each event listener.

Conclusion

To remove all event listeners of a DOM object with JavaScript, we can get all event listener names with getEventListeners.

Sometimes, we want to add line breaks to SVG text with JavaScript.

In this article, we’ll look at how to add line breaks to SVG text with JavaScript.

How to add line breaks to SVG text with JavaScript?

To add line breaks to SVG text with JavaScript, we set the text location explicitly.

For instance, we write

g.append("svg:text")
  .attr("x", 0)
  .attr("y", 30)
  .attr("class", "id")
  .append("svg:tspan")
  .attr("x", 0)
  .attr("dy", 5)
  .text((d) => {
    return d.name;
  })
  .append("svg:tspan")
  .attr("x", 0)
  .attr("dy", 20)
  .text((d) => {
    return d.sName;
  })
  .append("svg:tspan")
  .attr("x", 0)
  .attr("dy", 20)
  .text((d) => {
    return d.idCode;
  });

to call attr with 'dy' to set the y position of the tspan element relative to the first tspan.

Conclusion

To add line breaks to SVG text with JavaScript, we set the text location explicitly.

Sometimes, we want to play a notification sound on websites with JavaScript.

In this article, we’ll look at how to play a notification sound on websites with JavaScript.

How to play a notification sound on websites with JavaScript?

To play a notification sound on websites with JavaScript, we can create a new audio element and call play on it.

For instance, we write

const playSound = (url) => {
  const audio = new Audio(url);
  audio.play();
};

to create the playSound function that creates a new Audio object with the source being the audio file at the url.

Then we call play on it to play the audio at the url.

Conclusion

To play a notification sound on websites with JavaScript, we can create a new audio element and call play on it.