To change the background color of the left and right panels and adjust the border color on "goNextDiff" and "goPrevDiff" events in a web application, we need to apply some custom CSS styles. Assuming you have two panels with class names "left-panel" and "right-panel," and "goNextDiff" and "goPrevDiff" events are triggered by some user interactions (e.g., button clicks), you can achieve this as follows:

HTML Structure:

html
<div class="left-panel">Left Panel Content</div> <div class="right-panel">Right Panel Content</div> <button id="goNextBtn">Go to Next Diff</button> <button id="goPrevBtn">Go to Previous Diff</button>

CSS Styles:

css
.left-panel { background-color: lightblue; } .right-panel { background-color: lightgreen; } .left-panel.active-diff { border-top: 2px solid red; } .right-panel.active-diff { border-bottom: 2px solid red; }

JavaScript (assuming you're using jQuery for simplicity):

javascript
// Handle "Go to Next Diff" button click $('#goNextBtn').on('click', function() { // Remove the active-diff class from both panels $('.left-panel').removeClass('active-diff'); $('.right-panel').removeClass('active-diff'); // Add the active-diff class to the next diff (for illustration, I'm using 'active-diff' as the class name to show the difference) // You'll need to adjust this logic based on how you identify and navigate to the next diff. // For example, if you're using some diff library, it might have its own methods to navigate between diffs. const nextDiffIndex = // Calculate the index of the next diff; $('.left-panel').eq(nextDiffIndex).addClass('active-diff'); $('.right-panel').eq(nextDiffIndex).addClass('active-diff'); }); // Handle "Go to Previous Diff" button click $('#goPrevBtn').on('click', function() { // Remove the active-diff class from both panels $('.left-panel').removeClass('active-diff'); $('.right-panel').removeClass('active-diff'); // Add the active-diff class to the previous diff (similarly, adjust this logic based on how you identify and navigate to the previous diff) const prevDiffIndex = // Calculate the index of the previous diff; $('.left-panel').eq(prevDiffIndex).addClass('active-diff'); $('.right-panel').eq(prevDiffIndex).addClass('active-diff'); });

Please note that the JavaScript part of the code is generic and does not provide specific logic to identify the diffs. Depending on your use case, you'll need to customize this logic to navigate between the diffs. Also, the "active-diff" class is just used here for demonstration purposes. You may need to adjust the class name and styles to match your specific application requirements.

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