Author: John Au-Yeung

Sometimes, we want to compare JavaScript strings and get end difference.

In this article, we’ll look at how to compare JavaScript strings and get end difference.

How to compare JavaScript strings and get end difference?

To compare JavaScript strings and get end difference, we can use the JavaScript string’s split and join methods.

For instance, we write:

const a = "The quick brown fox"
const b = "The quick brown fox jumps over the lazy dog."

const diff = (diffMe, diffBy) => diffMe.split(diffBy).join('')

const c = diff(b, a)
console.log(c)

We create the diff function by calling split with diffBy and then calling join to join back the substring array returned by split.

Then we call diff with b and a to split b with a as the separator.

As a result, we get c, which is ' jumps over the lazy dog.'.

Conclusion

To compare JavaScript strings and get end difference, we can use the JavaScript string’s split and join methods.

Sometimes, we want to change div text with jQuery toggle.

In this article, we’ll look at how to change div text with jQuery toggle.

How to change div text with jQuery toggle?

To change div text with jQuery toggle, we can call the text method of an element.

For instance, we write:

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

<div id="box">
  <div class="open">Show</div>
  <div class="showpanel">This is content</div>

  <div class="open2">Show</div>
  <div class="showpanel2">This is content</div>
</div>

to add some HTML elements.

Then we write:

$('.open').click(function() {
  const link = $(this);
  $('.showpanel').slideToggle('slow', function() {
    if ($(this).is(':visible')) {
      link.text('close');
    } else {
      link.text('open');
    }
  });
});

We select the divs with class open with $('.open').

Then we call click to add click handlers to them.

Next, we select the divs with class showpanel with $('.showpanel').

And then we call slidetoggle to add a slide toggle effect when we they’re shown or hidden from the screen.

In the event handler which is called when the animation is done, we call link.text to change the text of the link we selected earlier.

Conclusion

To change div text with jQuery toggle, we can call the text method of an element.

Sometimes, we want to increment number by 0.01 in JavaScript using a loop.

In this article, we’ll look at how to increment number by 0.01 in JavaScript using a loop.

How to increment number by 0.01 in JavaScript using a loop?

To increment number by 0.01 in JavaScript using a loop, we can use the JavaScript number’s toFixed method.

For instance, we write:

const heights = [];
for (let i = 1.20, l = 2.5; i < l; i += 0.01) {
  heights.push(i.toFixed(2));
}
console.log(heights)

We add a for loop that increments i by 0.01 with each iteration.

Then we call i.toFixed with 2 to round i to 2 decimal places and convert it to a string.

Then we call height.push to append the string to the array.

Conclusion

To increment number by 0.01 in JavaScript using a loop, we can use the JavaScript number’s toFixed method.

Sometimes, we want to get an element’s tag name in JavaScript.

In this article, we’ll look at how to get an element’s tag name in JavaScript.

How to get an element’s tag name in JavaScript?

To get an element’s tag name in JavaScript, we can use an element’s nodeName property.

For instance, we write:

<div>

</div>

to add a div.

Then we write:

console.log(document.querySelector('div').nodeName)

to select the div with document.querySelector.

And use the nodeName property to return the node’s tag name as a string.

As a result, we should see 'DIV' logged.

Conclusion

To get an element’s tag name in JavaScript, we can use an element’s nodeName property.

Sometimes, we want to add HTML datalist values from array with JavaScript.

In this article, we’ll look at how to add HTML datalist values from array with JavaScript.

How to add HTML datalist values from array with JavaScript?

To add HTML datalist values from array with JavaScript, we can create option elements with document.createElement.

For instance, we write:

<input name="fruit" list="list" />
<datalist id="list"></datalist>

to add the input and datalist element for the input.

Then we write:

const fruits = ['apple', 'orange'];
const list = document.getElementById('list');

for (const f of fruits) {
  const option = document.createElement('option');
  option.value = f;
  list.appendChild(option);
};

We get the input with document.getElementById.

Then we loop through each element in fruits with a for-of loop.

In the loop, we call document.createElement to create an option element.

Then we set the option.value property’s value to f.

Next, we call list.appendChild with option to add the option element to the datalist element.

Conclusion

To add HTML datalist values from array with JavaScript, we can create option elements with document.createElement.