Highlights of JavaScript — Selecting Elements and the DOM

Highlights of JavaScript — Selecting Elements and the DOM

To learn JavaScript, we must learn the basics.

To learn JavaScript, we must learn the basics.

In this article, we’ll look at the most basic parts of the JavaScript language.

Target All Elements by Tag Name with querySelectorAll

The document.querySelectorAll method lets us get all the elements with the given selector.

So to get all the elements with the given tag name, we can write the following HTML:

<p>foo.</p>
<p>bar.</p>
<p>baz.</p>

Then we can get all of them and style them by writing:

const pars = document.querySelectorAll('p')
for (const p of pars) {
  p.style.fontFamily = "Verdana, Geneva, sans-serif";
}

We get all the p elements with document.querySelectorAll .

Then we loop through each item with the for-of loop and set the style.fontFamily property to set the font family.

Target Some Elements by Tag Name

We can target some elements by tag name with the document.querySelectorAll method since it takes any selector string as an argument.

For example, if we have the following HTML table:

<table>
  <tr>
    <td>foo</td>
    <td>bar</td>
    <td>baz</td>
  </tr>
</table>

and we want to get all the td elements in the table, we can write:

const tds = document.querySelectorAll('table td')
for (const t of tds) {
  t.style.backgroundColor = "pink";
}

We get the td elements within the table element with the table td selector.

Then we loop through the td elements and set the backgroundColor to 'pink' .

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