# Bookmarklet to collapse Azure DevOps PR file tree

# My approach to reviewing PRs

As I’ve written in [How I review a full stack Pull Request](https://tjhilton.hashnode.dev/how-i-review-a-full-stack-pull-request), when I’m reviewing a large PR I like to review the changes one section at a time. For the projects I work with, there are typically top-level `/src` and `/test` folders, each of which contains multiple subfolders with one project in each. For a while I’ve wanted to collapse the Azure DevOps pull request view to that 2nd level (the project folders) to make it easier to review them one at a time, and recently I finally got round to making it happen.

# Automating the collapse

I’ve written the following bookmarklet which collapses the file tree to the second level of folders. It’s a bit hacky and I daresay it’s not very robust, but it works enough that it adds value to me.

```javascript
javascript:(function() {
    const sub = setInterval(() => {
        const items = document.querySelectorAll('tr.bolt-tree-row[aria-level="2"][aria-expanded="true"] .bolt-tree-expand-button');
        if (items.length === 0) {
            clearTimeout(sub);
            return;
        }
    
        items.forEach(el => el.click());
    }, 20);
})();
```

# How to use the bookmarklet

To use a bookmarklet you must create a browser bookmark and provide the code as the URL. The exact details might vary by browser, but in google chrome you can do this as follows:

* Right click on your bookmark toolbar and click Add Page.
    
* Provide a name, which is what you will see in the bookmark toolbar.
    
* Paste the above script into the URL.
    

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1747148325162/a20b93f9-c63d-4ae3-a8f4-5725bd5bc7a0.png align="center")

When you are viewing the PR in Azure DevOps, you simply click the bookmarklet in your bookmark bar, and the PR tree should collapse. I tested this script on the assumption of being at the top of the scrollable project structure and it’s untested if you’re not at the top. Because the script is a bit hacky, it’s quite possible that it won’t work perfectly every time, but you can keep clicking it without doing any harm.