Set javascript link

In web development, JavaScript is an important programming language. It can help developers increase the interactivity of web pages, thereby improving user experience. And links are also one of the indispensable elements in web pages. In this article, we'll explore how to use JavaScript to set up links to make your web pages more interactive and flexible.

1. Basic hyperlinks

First, let us familiarize ourselves with basic hyperlinks. A basic HTML hyperlink looks like this:

<a href="https://www.example.com">Link Text</a>

Where the href attribute is used to define the target URL of the link, and Link Text is the text visible to the user. When the user clicks the link, the page will reload and take the user to the target URL.

2. Open the link to a new tab

Sometimes, we want the link to open in a new tab after the user clicks it, instead of loading the target URL in the current page. Using JavaScript, we can use the following code to achieve this function:

document.querySelector('a').addEventListener('click', function(event) {
  event.preventDefault();
  window.open(this.href, '_blank');
});

This code uses the addEventListener() function to listen for the click event. The event.preventDefault() function prevents the default behavior of loading the target URL in the current tab when a click event occurs. Afterwards, the window.open() function is used, passing in the URL of the target link and the _blank parameter, telling the browser to open the link in a new tab.

3. Add hover effect to link

It is very simple for us to use JavaScript to add hover effect to link. Just add listeners for the mouseenter and mouseleave events to the link to trigger the effect when the mouse is hovering. For example:

document.querySelector('a').addEventListener('mouseenter', function() {
  this.style.color = 'red';
});
document.querySelector('a').addEventListener('mouseleave', function() {
  this.style.color = '';
});

In this example, we use this to reference the link element. On mouseover, we set the font color of the link to red. Resets link style to default after mouseover.

4. Dynamically adjust the link

Sometimes, we will need to change the link as a result of the user's interaction with the web page. Using JavaScript, we can very easily dynamically affect the properties of a link, such as the link's href, target or title, etc. For example:

document.querySelector('a').addEventListener('click', function() {
  this.href = 'https://www.new-link.com';
  this.target = '_blank';
  this.title = 'New Page';
});

In this example, when the user clicks on the link, the JavaScript code will change the link properties. The link's href will be changed to point to https://www.new-link.com, and the target attribute will be set to _blank , and the title attribute will be changed to New Page.

5. Dynamically update the link based on the scroll position

We can also use JavaScript to dynamically update the link status based on the user's scroll position. This technique can come in handy if you want to display a "back to top" link at the top of your website when the user scrolls to a certain point on the page. The following is a sample code on how to achieve this effect:

window.addEventListener('scroll', function() {
  var scrollPosition = window.scrollY;
  var link = document.querySelector('.back-to-top');

  if (scrollPosition > 500) {
    link.classList.add('show');
  } else {
    link.classList.remove('show');
  }
});

In this example, we use the window.addEventListener() function to listen for the scroll event. This event is fired every time the user scrolls the page. window.scrollY property can get the current scroll position. In this code, we add a .show to the class of .back-to-top so that it appears at the top of the screen when the user scrolls down more than 500px. If the user scrolls up, the link's display will be hidden.

6. Summary

JavaScript is a flexible language and one of the valuable tools for web developers. By learning the tips and examples mentioned in this article, you can take advantage of Javascript and add more interactive links to make the user experience smoother and more natural. For readability and maintainability, you may want to put a lot of your JavaScript code into a separate file and then introduce it in your HTML via the script tag.

In actual development, we can also use more JavaScript technologies to finely control links, such as template text, dynamic styles, link preloading, etc. If needed, you can find more related techniques in the JavaScript documentation.

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