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JavaScript Answers jQuery

How to get the total number of elements selected with jQuery?

Sometimes, we want to get the total number of elements selected with jQuery.

In this article, we’ll look at how to get the total number of elements selected with jQuery.

How to get the total number of elements selected with jQuery?

To get the total number of elements selected with jQuery, we can use the length property.

For instance, if we have:

<div>
  foo
</div>
<div>
  bar
</div>
<div>
  baz
</div>

Then we write:

console.log($('div').length)

to log the number of divs selected, which is 3.

Conclusion

To get the total number of elements selected with jQuery, we can use the length property.

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JavaScript Answers jQuery

How to show a “are you sure?” dialog when we click on a link with JavaScript or jQuery?

Sometimes, we want to show a "are you sure?" dialog when we click on a link with JavaScript or jQuery.

In this article, we’ll look at to show a "are you sure?" dialog when we click on a link with JavaScript or jQuery.

How to show a "are you sure?" dialog when we click on a link with JavaScript or jQuery?

To show a "are you sure?" dialog when we click on a link with JavaScript or jQuery, we can call the confirm function in the click event handler of a link.

For instance, we write:

<a href="/DoSomethingDangerous" class='confirm'>do something dangerous</a>

to add the link.

Then we write:

$(() => {
  $('.confirm').click((e) => {
    return window.confirm("Are you sure?");
  });
});

We select the link with $.

And we call click with the click event handler for the link.

In the click event handler, we call window.confirm with the text we want to show in the dialog.

Now when we click on the link, we see ‘Are you sure?’ displayed.

And we can click OK or Cancel to dismiss it.

Conclusion

To show a "are you sure?" dialog when we click on a link with JavaScript or jQuery, we can call the confirm function in the click event handler of a link.

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JavaScript Answers jQuery

How to clear a text area on focus with JavaScript?

Sometimes, we want to clear a text area on focus with JavaScript.

In this article, we’ll look at how to clear a text area on focus with JavaScript.

How to clear a text area on focus with JavaScript?

To clear a text area on focus with JavaScript, we can call the val method with an empty string when we add a focus event handler to the text area with focus.

For instance, we write:

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>

<textarea>hello world</textarea>

to add a text area.

Then we write:

$('textarea').focus(function() {
   $(this).val('');
});

We select the text area with $.

Then we call focus to add a focus event handler with a function that empties the text area with $(this).val('');.

Therefore, when we click inside the text area, it becomes empty.

Conclusion

To clear a text area on focus with JavaScript, we can call the val method with an empty string when we add a focus event handler to the text area with focus.

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JavaScript Answers jQuery

How to Toggle Show or Hide on Click with jQuery?

Sometimes, we want to toggle show or hide on click with jQuery.

In this article, we’ll look at how to toggle show or hide on click with jQuery.

Toggle Show or Hide on Click with jQuery

To toggle show or hide on click with jQuery, we can use the toggle method in the click handler of the toggle button.

For instance, we write:

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>

<button>
  toggle
</button>

<div>
  hello world
</div>

to add a toggle button and a div to toggle on and off.

Then we write:

$("button").click(() => {
  $('div').toggle("slide", {
    direction: "right"
  }, 1000);
});

to get the button with $ and add a click event handler to it with click.

In the click handler, we get the div with $.

And we call toggle on it with the effect to apply when toggling and an object to set the direction of the slide.

The 3rd argument is the number of milliseconds to show the transition effect when sliding.

Now when we click toggle, we should see ‘hello world’ being slid right and left when toggling off and on respectively.

Conclusion

To toggle show or hide on click with jQuery, we can use the toggle method in the click handler of the toggle button.

Categories
JavaScript Answers jQuery

How to Trigger an Event When Clicking Outside an Element with jQuery?

Sometimes, we want to trigger an event when clicking outside the element with jQuery.

In this article, we’ll look at how to trigger an event when clicking outside the element with jQuery.

Trigger Event When Clicking Outside an Element with jQuery

To trigger an event when clicking outside the element with jQuery, we can listen to the click event on the html element.

Then in the event handler, we can check which element is clicked.

For instance, we write:

<div id='your-div-id'>
  hello world
</div>

to add a div and we want to detect whether we clicked outside of it.

Then we write:

$('html').click((e) => {
  if (e.target.id !== 'your-div-id' && $(e.target).parents('#your-div-id').length === 0) {
    console.log('clicked outside')
  }
});

to select the html element with $('html').

Then we call click on it with the click event listener.

We get the element we clicked on with the e.target property.

So if its id isn’t 'your-div-id' and its parent elements also don’t contain the div with ID your-div-id as returned by the parents method, then we know we clicked outside the div with ID your-div-id.

Therefore, when we click outside the div we added, we see 'clicked outside' logged in the console.

Conclusion

To trigger an event when clicking outside the element with jQuery, we can listen to the click event on the html element.

Then in the event handler, we can check which element is clicked.