javascript cannot display hyperlinks

JavaScript has always been considered an important part of web application development. It adds many dynamic effects to web pages. Of course, we cannot deny the shortcomings and limitations of JavaScript. One of them is that it cannot display hyperlinks directly.

Hyperlink is one of the most basic and common elements in web applications. It allows users to easily jump between different web pages. Through hyperlinks, we can point one page directly to another page, or even jump between different websites. None of this requires the user to perform any program operations, just click on a text, picture or icon. Such convenience makes hyperlinks an integral part of website design and development.

However, if you want to display a hyperlink via JavaScript, you will find that no matter how hard you try, it is impossible to achieve this goal. Why is this?

JavaScript can indeed create and edit hyperlinks, but it cannot be displayed directly in the current page. The reason is that JavaScript does not have the ability to change the structure of the DOM document. DOM (Document Object Model) refers to the document object model created by the browser after rendering the WEB page. It describes the hierarchical structure of the web page and the relationship between elements. Through JavaScript, we can dynamically manipulate the DOM to achieve many dynamic interactive effects. However, JavaScript can only attach events and attributes to HTML elements and cannot add other content to existing HTML elements.

Someone may suggest that Ajax technology can solve this problem. Ajax can obtain data through background communication and dynamically update page content without refreshing the web page. Although Ajax technology can achieve the effect of dynamically updating page content, it still cannot directly display hyperlinks. Because Ajax can obtain data through background communication, it can only dynamically generate HTML elements through JavaScript after requesting data in the background, and add these elements to specified locations in the document.

It can be seen that JavaScript cannot directly display hyperlinks. However, for a better user experience, we can use CSS, HTML and JavaScript to achieve effects similar to hyperlinks.

First of all, we can use pseudo-classes to achieve an effect similar to a hyperlink. This can be achieved with the following CSS code:

a.fake-link {
  cursor: pointer;
  text-decoration: underline;
  color: blue;
}

This code will create a class called "fake-link" that looks a lot like a hyperlink with underline and blue text. Next, actions are implemented through JavaScript and event listening. When this class is clicked, it can jump to the specified URL address. For example:

<p>请点击<a class="fake-link" href="#">此处</a>跳转到百度</p>

<script>
document.querySelector('.fake-link').addEventListener('click', function () {
  window.location.href = 'https://www.baidu.com';
});
</script>

Through JavaScript, we added a click event to the pseudo-class and used the window.location.href property to redirect the user to the specified URL address (in this case, Baidu's homepage). In this way, we achieve a "hyperlink-like" effect.

In addition to pseudo-classes, we can also create and edit HTML elements through JavaScript and add them to the document. For example, we can use JavaScript to create a link element and add it to a specified location in the document. At the same time, we can also add event listening for this new link element to achieve the dynamic jump effect we want. For example:

<button id="btn-add-link">添加链接</button>

<script>
document.querySelector('#btn-add-link').addEventListener('click', function () {
  var link = document.createElement('a');
  link.href = 'https://www.baidu.com';
  link.target = '_blank';
  link.innerText = '百度';

  document.querySelector('body').appendChild(link);

  link.addEventListener('click', function (event) {
    event.preventDefault();
    window.location.href = link.href;
  });
});
</script>

This code will create a button element and add a click event listener to it. When the user clicks the button, JavaScript creates a link element containing the URL address and adds it to the document. At the same time, we added a click event to this link element and used the preventDefault() method to prevent the default behavior of the link. In the click event handler, we implement the required jump effect and redirect the user to the specified URL address.

Through the above methods, we can achieve similar effects to hyperlinks. Of course, these effects require the use of technical means such as JavaScript, CSS, and HTML. Even so, they can't compare to the meaning and value contained in a hyperlink. Therefore, when developing web applications, we should still use hyperlinks as much as possible to achieve the required jump effect. At the same time, we should also fully realize the limitations and shortcomings of JavaScript, and constantly explore new technical means to bring a better experience to users.

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