Generating a transient image upon a key press event using JavaScript

Question

Generating a transient image upon a key press event using JavaScript

I'm currently working on a personal website as a fun project, and I had the idea of adding an easter egg feature where if a user presses the letter "e" anywhere on the site, a small image of a speech balloon will briefly appear and then disappear. Ideally, it would also make a sound or randomly appear on different parts of the page, but my main goal right now is just to get it functioning properly. Unfortunately, I don't have much experience with JavaScript.

I've been doing some research and found examples of displaying an image when clicked, as well as translating key presses into click events, but I'm having trouble putting everything together correctly. I've tried several methods but haven't had any success so far. I've even looked into scripts that create images when clicked, but I'm not sure how to adapt that to a key press event.

Here is what I have managed to come up with so far. From my understanding, I've set up an event listener to detect when the "E" key is pressed, and then it should call the showImage function to change the display property of the div from 'none' to 'block'. However, when I press the "E" key, nothing happens.

<script>
var addEvent = document.addEventListener ? function(target,type,action){
    if(target){
        target.addEventListener(type,action,false);
    }
} : function(target,type,action){
    if(target){
        target.attachEvent('on' + type,action,false);
    }
}

addEvent(document,'keydown',function(e){
    e = e || window.event;
    var key = e.which || e.keyCode;
    if(key===101){
        showImage();
    }
});

const showImage = () => {
        document.getElementById("first").style.display ='block';
    }
</script>

<body>
<div id="first" style="height:400px; width:400px; display:none;">
    <img src="test.png"> 
</div>
</body>

javascript

Answer 1

Answer №1

To begin, let's implement an appropriate event handler by adding the necessary code. The current code contains outdated workarounds that are no longer required. Consider using a simpler approach like this:

document.addEventListener('keydown', e => {
  console.log(e);
});

Afterwards, check your browser's developer console, navigate back to the page, and try typing a key to view keyboard events on the console.

We will now create a hidden element on the page featuring both an image and audio:

<div class="hidden" data-key-code="KeyE">
  <img src="https://i0.wp.com/acegif.com/wp-content/gif/confetti-40.gif" />
  <audio src="https://actions.google.com/sounds/v1/crowds/female_crowd_celebration.ogg" />
</div>

In your CSS, include a utility rule:

.hidden {
  display: none;
}

Upon page load, the hidden element will not be visible due to the display: none property. Continuing with JavaScript for handling keyboard events.

The HTML includes a data attribute for the key code allowing easy modification in the future without altering the JavaScript. You can add multiple elements on the page without requiring script changes. Here is our script:

document.addEventListener('keydown', e => {
  // Obtain the desired element, if present.
  const el = document.querySelector(`[data-key-code="${e.code}"]`);

  // If element not found, do nothing.
  if (!el) {
    return;
  }

  // Toggle visibility of the element
  el.classList.toggle('hidden');

  // If element is hidden, pause the audio; otherwise, play it.
  el.querySelector('audio')[
    el.matches('.hidden') ? 'pause' : 'play'
  ]();
});

Test a live example here: https://jsfiddle.net/fqaogu59/

Answer 2

To begin, let's implement an appropriate event handler by adding the necessary code. The current code contains outdated workarounds that are no longer required. Consider using a simpler approach like this:

document.addEventListener('keydown', e => {
  console.log(e);
});

Afterwards, check your browser's developer console, navigate back to the page, and try typing a key to view keyboard events on the console.

We will now create a hidden element on the page featuring both an image and audio:

<div class="hidden" data-key-code="KeyE">
  <img src="https://i0.wp.com/acegif.com/wp-content/gif/confetti-40.gif" />
  <audio src="https://actions.google.com/sounds/v1/crowds/female_crowd_celebration.ogg" />
</div>

In your CSS, include a utility rule:

.hidden {
  display: none;
}

Upon page load, the hidden element will not be visible due to the display: none property. Continuing with JavaScript for handling keyboard events.

The HTML includes a data attribute for the key code allowing easy modification in the future without altering the JavaScript. You can add multiple elements on the page without requiring script changes. Here is our script:

document.addEventListener('keydown', e => {
  // Obtain the desired element, if present.
  const el = document.querySelector(`[data-key-code="${e.code}"]`);

  // If element not found, do nothing.
  if (!el) {
    return;
  }

  // Toggle visibility of the element
  el.classList.toggle('hidden');

  // If element is hidden, pause the audio; otherwise, play it.
  el.querySelector('audio')[
    el.matches('.hidden') ? 'pause' : 'play'
  ]();
});

Test a live example here: https://jsfiddle.net/fqaogu59/

Answer 3

Answer №2

To display an image after a key press event, you can use the following method:

// Trigger the event
document.addEventListener("keyup", (event)=>{
// Check if the pressed key matches the desired key
  if (event.key == "e")
  {
    // Select the image element
    const img = document.querySelector("#your_img");

    // Change the display property to show the image
    img.style.display = "initial";
  }
});

It's important to note that accessing the image directly upon key press may not be optimal, as it involves querying the DOM each time. However, in the case of an easter egg like this where the key is unlikely to be pressed multiple times, the current approach should suffice.

Answer 4

To display an image after a key press event, you can use the following method:

// Trigger the event
document.addEventListener("keyup", (event)=>{
// Check if the pressed key matches the desired key
  if (event.key == "e")
  {
    // Select the image element
    const img = document.querySelector("#your_img");

    // Change the display property to show the image
    img.style.display = "initial";
  }
});

It's important to note that accessing the image directly upon key press may not be optimal, as it involves querying the DOM each time. However, in the case of an easter egg like this where the key is unlikely to be pressed multiple times, the current approach should suffice.

Answer 5

Answer №3

It seems like the code snippet provided is implementing a function called showImage that displays an element with the id "first" when the key "E" is pressed. Additionally, there is an event listener listening for keyup events and calling the showImage function when the key pressed is "E".

<script>

     const displayOnKeyPress = () => {
        document.getElementById("first").style.display ='block';
    }
    // Function to be triggered on key press
    function handleKeyPressed(event) {
        // Check if the pressed key is "E"
        if (event.key === "E") {
            displayOnKeyPress();
        }
    }

    // Add event listener for the 'keyup' event
    document.addEventListener("keyup", handleKeyPressed);
</script>

Answer 6

It seems like the code snippet provided is implementing a function called showImage that displays an element with the id "first" when the key "E" is pressed. Additionally, there is an event listener listening for keyup events and calling the showImage function when the key pressed is "E".

<script>

     const displayOnKeyPress = () => {
        document.getElementById("first").style.display ='block';
    }
    // Function to be triggered on key press
    function handleKeyPressed(event) {
        // Check if the pressed key is "E"
        if (event.key === "E") {
            displayOnKeyPress();
        }
    }

    // Add event listener for the 'keyup' event
    document.addEventListener("keyup", handleKeyPressed);
</script>

Generating a transient image upon a key press event using JavaScript

Answer №1

Answer №2

Answer №3

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