`#` or `javascript:void(0)`: Which is the Better `href` Value for JavaScript Links?

Choosing the Optimal "href" Value for JavaScript Links: "#" or "javascript:void(0)"

When creating links that execute JavaScript code, developers often face the dilemma of choosing between using "#" or "javascript:void(0)" as the "href" attribute. Let's explore the respective advantages and disadvantages to determine which option is more suitable.

Functionality

Both "#" and "javascript:void(0)" serve the same purpose of preventing the link from triggering page navigation. However, there's a subtle difference in how they handle returned values from JavaScript functions. When using "#", the returned value of the JavaScript function is discarded. This can potentially lead to unintended behavior if the function is expected to return a value, such as "false" to prevent default form submission.

Page Load Speed

Using "#" slightly improves page load speed compared to "javascript:void(0)". This is because "#" does not trigger any external HTTP requests, while "javascript:void(0)" requires the browser to parse and execute the "void(0)" function. However, the difference in page load speed is negligible.

Validation Purposes

Both "#" and "javascript:void(0)" are valid HTML5 attributes. Web validators will not raise any errors for either of them.

Development Considerations

• Code Simplicity: Using "javascript:void(0)" can simplify code, as it avoids the need to explicitly return "false" in JavaScript functions.
• Error Handling: Using "javascript:void(0)" eliminates the risk of errors in JavaScript functions preventing the link from working.
• Dynamic Function Attachment: When assigning event handlers dynamically, "javascript:void(0)" provides more flexibility. It allows functions to be attached to the event property without worrying about return values or error handling.

Conclusion

Based on the considerations discussed, using "javascript:void(0)" is generally preferred over "#" for JavaScript links. It simplifies code, minimizes potential errors, and provides greater flexibility in dynamic event handling.

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