I require a breakdown of the JavaScript code, please

Question

I require a breakdown of the JavaScript code, please

Are you struggling with a code snippet that involves CSS, JavaScript, and HTML?

Let's take a look at the complete code:

<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="http://snipplicious.com/css/bootstrap-3.2.0.min.css">
...

Now, let's delve into the JavaScript portion of the code for further explanation:

<script>$(function () {
    ...
});</script>

Here are my questions:

What does "e" represent in the function(e) within the JavaScript code above, and where does the value assigned to "e" originate from?

How can we convert the provided JavaScript code into a reusable function? I attempted the following:

function showHide(e) {
    ...
}

Unfortunately, my attempt did not yield the desired result.

UPDATE:

After implementing suggestions by Ze Rubeus and A.Wollff, here is the revised code:

<!doctype html>
<html>
<head>
    <link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
...

Feel free to review the updated code. Thank you for your help!

javascript jquery html css

Answer 1

Answer №1

Using the e can give you specific details about the click event, such as whether it was a left, right, or center click, the coordinates clicked, and the DOM object clicked on. This syntax belongs to Jquery, not JavaScript.

<script>
    $(function () {
        $('.tree li').on('click', function (e) {
            var children = $(this).find('> ul > li');
            if (children.is(":visible")) 
              children.hide('fast');
            else 
              children.show('fast');
            e.stopPropagation();
        });
    });
</script>

As for the second question, the syntax $(this).find('> ul > li'); is incorrect in JavaScript:

function showHide(e) {
    var children = $(this).find('> ul > li');
    if (children.is(":visible")) 
      children.hide('fast');
    else 
      children.show('fast');
    e.stopPropagation(); 
}

If it were a valid JS syntax, you would call your function like this by passing a value to e, but it doesn't make sense with your code:

showHide(e);

Alternatively, you can use an IIFE (Immediately-invoked function expression) like the following:

(function(){
  var children = $(this).find('> ul > li');
  if (children.is(":visible")) 
    children.hide('fast');
  else 
    children.show('fast');
  e.stopPropagation(); 
}(e));

Another solution to adapt your function with the provided code above:

$(function () {
    $('.tree li').on('click', showHide);
});

function showHide(e) {
    var children = $(this).find('> ul > li');
    if (children.is(":visible")) 
      children.hide('fast');
    else 
      children.show('fast');
    return false;
}

Check out the LIVE DEMO here!

Answer 2

Using the e can give you specific details about the click event, such as whether it was a left, right, or center click, the coordinates clicked, and the DOM object clicked on. This syntax belongs to Jquery, not JavaScript.

<script>
    $(function () {
        $('.tree li').on('click', function (e) {
            var children = $(this).find('> ul > li');
            if (children.is(":visible")) 
              children.hide('fast');
            else 
              children.show('fast');
            e.stopPropagation();
        });
    });
</script>

As for the second question, the syntax $(this).find('> ul > li'); is incorrect in JavaScript:

function showHide(e) {
    var children = $(this).find('> ul > li');
    if (children.is(":visible")) 
      children.hide('fast');
    else 
      children.show('fast');
    e.stopPropagation(); 
}

If it were a valid JS syntax, you would call your function like this by passing a value to e, but it doesn't make sense with your code:

showHide(e);

Alternatively, you can use an IIFE (Immediately-invoked function expression) like the following:

(function(){
  var children = $(this).find('> ul > li');
  if (children.is(":visible")) 
    children.hide('fast');
  else 
    children.show('fast');
  e.stopPropagation(); 
}(e));

Another solution to adapt your function with the provided code above:

$(function () {
    $('.tree li').on('click', showHide);
});

function showHide(e) {
    var children = $(this).find('> ul > li');
    if (children.is(":visible")) 
      children.hide('fast');
    else 
      children.show('fast');
    return false;
}

Check out the LIVE DEMO here!

Answer 3

Answer №2

The code snippet utilizes jQuery instead of pure JavaScript. It begins with a wrapper function that ensures the DOM has finished loading before execution:

$(function () {
...
});

This is important when attaching event handlers, like in this example:

$('.tree li').on('click', function (e) {
...
}

Here, an "onclick" event handler is attached to list items with a parent of class "tree", where the "e" argument refers to the triggering element.

The remaining code involves basic jQuery DOM manipulation.

You mentioned converting it to a function, but I'm not sure what you mean by that. The provided snippet already sets up an event handler, typically done just once. If you're referring to converting it to a pure JavaScript function, that's a different task altogether.

Answer 4

The code snippet utilizes jQuery instead of pure JavaScript. It begins with a wrapper function that ensures the DOM has finished loading before execution:

$(function () {
...
});

This is important when attaching event handlers, like in this example:

$('.tree li').on('click', function (e) {
...
}

Here, an "onclick" event handler is attached to list items with a parent of class "tree", where the "e" argument refers to the triggering element.

The remaining code involves basic jQuery DOM manipulation.

You mentioned converting it to a function, but I'm not sure what you mean by that. The provided snippet already sets up an event handler, typically done just once. If you're referring to converting it to a pure JavaScript function, that's a different task altogether.

Answer 5

Answer №3

The event 'e' is triggered by a user interaction such as a mouse click, and it relates to the element that was clicked.

If you wish to convert the code into a function, consider implementing it in this manner:

<script>
$('.tree li').on('click', function (e) {
        showHide(e);
        e.stopPropagation();
});

function showHide(e){
        var children = $(this).find('> ul > li');
        if (children.is(":visible")) children.hide('fast');
        else children.show('fast');
}
</script>

Answer 6

The event 'e' is triggered by a user interaction such as a mouse click, and it relates to the element that was clicked.

If you wish to convert the code into a function, consider implementing it in this manner:

<script>
$('.tree li').on('click', function (e) {
        showHide(e);
        e.stopPropagation();
});

function showHide(e){
        var children = $(this).find('> ul > li');
        if (children.is(":visible")) children.hide('fast');
        else children.show('fast');
}
</script>

Answer 7

Answer №4

What exactly is the value of "e" in function(e) within the JavaScript code above, and where does this value come from?

"e" represents an alias variable for the event object, which contains properties providing details about the type of event, the target element that triggered the event, and other information.

How can the JavaScript code mentioned above be converted into a function? I have attempted to do so but encountered difficulties.

The provided code snippet utilizes the jQuery JavaScript library. The $ symbol functions as an alternate identifier for the globally defined jQuery object once the library has been included.

function showHide(e) {
    var children = $(this).find('> ul > li');
    if (children.is(":visible")) children.hide('fast');
    else children.show('fast');
    e.stopPropagation(); 
}

In this case, you are defining a function but it still needs to be associated with an event, specifically a click event on an li element. Since you are using jQuery methods within showHide, you must use jQuery to attach an event handler as per your instructions.

$('tree li').on('click',showHide);

If you can rewrite the code inside showHide() using pure JS, you may then link the event to an element like so:

document.getElementById('myLi').addEventListener('click', showHide, false);

Answer 8

What exactly is the value of "e" in function(e) within the JavaScript code above, and where does this value come from?

"e" represents an alias variable for the event object, which contains properties providing details about the type of event, the target element that triggered the event, and other information.

How can the JavaScript code mentioned above be converted into a function? I have attempted to do so but encountered difficulties.

The provided code snippet utilizes the jQuery JavaScript library. The $ symbol functions as an alternate identifier for the globally defined jQuery object once the library has been included.

function showHide(e) {
    var children = $(this).find('> ul > li');
    if (children.is(":visible")) children.hide('fast');
    else children.show('fast');
    e.stopPropagation(); 
}

In this case, you are defining a function but it still needs to be associated with an event, specifically a click event on an li element. Since you are using jQuery methods within showHide, you must use jQuery to attach an event handler as per your instructions.

$('tree li').on('click',showHide);

If you can rewrite the code inside showHide() using pure JS, you may then link the event to an element like so:

document.getElementById('myLi').addEventListener('click', showHide, false);

I require a breakdown of the JavaScript code, please

Answer №1

Answer №2

Answer №3

Answer №4

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