Explore the root cause of the 'javascript:void(0)' error

An error that often occurs in JavaScript is the "javascript:void(0)" error. This error usually occurs with JavaScript functions in HTML, and the code implementation of the function is implemented as "javascript:void(0)". While this error may seem common, it can actually be very confusing.

This article will explore the root cause of the "javascript:void(0)" error. Apart from this, we will also discuss the solutions for this error and how it affects your website’s SEO.

Origin and Cause

The origin of this error can be traced back to the early days of web development, when web developers found themselves needing to solve some problems related to JavaScript implementation, such as how to correctly handle "links" ( link) and function calls in the "form" element. Therefore, they initially used a special auxiliary way to solve this problem, which was to use "javascript:void(0)" as the implementation code of the function. However, the fundamental problem with this implementation is that after the function is executed, links and form elements in the HTML will still initiate requests, causing the page to be reloaded after the function is executed.

Common examples are as follows:

<a href="javascript:void(0)" onclick="alert(&#39;Hello World!&#39;)">点击我</a>

Actually, this link won't do anything. When it's clicked, it just executes a JavaScript function. However, since the link has the href attribute, the browser tries to load it and resolve the function, so the page reloads.

Solution

The correct way to solve this problem is to avoid using this method to implement JavaScript functions in HTML code. The onclick attribute and the special protocol of javascript: can be used in generic HTML tags without providing any href value.

<a href="#" onclick="alert(&#39;Hello World!&#39;)">点击我</a>

As shown in the above code, the "#" symbol is used to represent the current page, not to perform any link or form action. This approach is more elegant and correct, and avoids loading additional resources and page refreshes.

SEO Impact

Having a “javascript:void(0)” error may have a negative impact on your site’s SEO. The reason why this error occurs on your site is that when a search engine crawler (such as GoogleBot) visits the website, it may try to parse and load these functions. Because of this error, it will not be able to execute the function and may cause some content to not be retrieved by search engines.

At the same time, if you implement functions in this way on your website instead of avoiding "javascript:void(0)" errors, search engines may not correctly recognize the content, causing it to be viewed as is spam and may have a negative impact on your website.

Conclusion

The "javascript:void(0)" error is a common but easy to avoid mistake. Most of the time, this error is caused by incorrect implementation of JavaScript functions in the HTML code. If you use the currently recommended methods to implement these features, this error is not inherently a problem. Regardless, you should ensure that your website is accessible and avoid causing any potential SEO issues as much as possible.

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