Why Isn't My JavaScript Function Executing on Link Click?

JavaScript Function Failing to Execute on Link Click

Problem Description

A web page consists of a sidebar navigation and an iframe for displaying content. The navigation contains links intended to change the iframe's content. However, the JavaScript function designed to alter the iframe's source is not functioning.

Solution

The main issue stemmed from omitting the parentheses necessary to execute the getContent function in the onclick event handler.

Additional Considerations

Avoid Inline Event Handlers

Using inline event handlers (e.g., onclick, onmouseover) is strongly discouraged as it leads to spaghetti code, code duplication, scalability issues, and deviations from best practices.

Separate HTML and JavaScript

Keep your HTML and JavaScript code separate for improved readability and easier maintenance.

Disable Link Navigation for Buttons

If using a link for a button-like element, set its href attribute to # instead of "" to prevent it from navigating.

Revised Code

Below is the revised code with the corrections applied:

<br>function getContent() {<br>  console.log("Old source was: "   iFrame.src);<br>  iFrame.src="LoremIpsum.html";<br>  console.log("New source is: "   iFrame.src);<br>}</p>
<p>// Get a reference to the button and the iframe<br>var btn = document.getElementById("btnChangeSrc");<br>var iFrame = document.getElementById("contentFrame");</p>
<p>// Set up a click event handler for the button<br>btn.addEventListener("click", getContent);<br>

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