Category: jQuery

Sometimes, we want to get all HTML element IDs with JavaScript.

In this article, we’ll look at how to get all HTML element IDs with JavaScript.

Get All HTML Element IDs with JavaScript

To get all HTML element IDs with JavaScript, we just have to select all the elements and then we can get the id property from each element.

For instance, if we have the following HTML:

<div id="mydiv">
  <span id='span1'></span>
  <span id='span2'></span>
</div>

Then we can get the IDs of all the span elements by writing:

const ids = [...$("#mydiv").find("span")].map(s => s.id);
console.log(ids)

We get all the spans with:

$("#mydiv").find("span")

Then we convert the returned nodelist into an array with the spread operator.

And then we call the JavaScript array map method it the returned array with a callback that returns the id from the s span element.

Therefore ids is [“span1”, “span2”] .

Conclusion

To get all HTML element IDs with JavaScript, we just have to select all the elements and then we can get the id property from each element.

Sometimes, we want to determine the pixel length of a string in JavaScript.

In this article, we’ll look at how to determine the pixel length of a string in JavaScript.

Determine the Pixel Length of a String in JavaScript

To determine the pixel length of a string in JavaScript, we can put the string in a span and then use the jQuery width method to determine the width of the span.

For instance, we can write the following HTML:

<span></span>

Then we can write:

const span = document.querySelector('span')  
span.innerText = 'Here is my string'  
console.log($(span).width())

to get the span width document.querySelector .

And then we set innerText to the string of the span.

Finally, we log the span’s width that we get from $(span).width() from jQuery.

The console log should log 111.

Conclusion

To determine the pixel length of a string in JavaScript and jQuery, we can put the string in a span and then use the jQuery width method to determine the width of the span.

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.

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.

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.