#optimistic ui

31 messages · Page 1 of 1 (latest)

strange ledge
#

how to rewrite this database call so that the ui is updated immediately before the fetch request is made

async function completeGoal(id: number, completed: string, target: any) { // added target
    if (target.dataset.goalcomplete == 'yes') {                             // added from here
        target.parentElement.firstElementChild.src = "tikedfilled.svg";
        target.parentElement.children[2].classList.add('goal-completed');
    }
    else if (target.dataset.goalcomplete == 'no') {
        target.parentElement.firstElementChild.src = "tikbox.svg";
        target.parentElement.children[2].classList.remove('goal-completed');
    }                                                                       // to here
    try {
        const response = await fetch(`/api/goals/${id}`, {
            method: 'PATCH',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({ completed }),
        });
        if (!response.ok) {
            throw new Error('Network response not ok');
        }
        repopulateGoals();
    }
    catch (error) {
        console.error('Error: ', error);
    }
}
pallid vergeBOT
#

Hi @strange ledge. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

#

The code you've provided already seems to be implementing an optimistic UI update. The UI is updated immediately before the fetch request is made. This is done by changing the UI based on the target.dataset.goalcomplete value. If it's 'yes', the UI is updated to reflect a completed goal, and if it's 'no', the UI is updated to reflect an uncompleted goal. This happens before the fetch request is made to the server to update the goal's status.

However, it's important to handle the case where the fetch request fails (for example, due to a network error or server error). In the catch block of your code, you might want to revert the UI changes if the fetch request fails. This would provide a better user experience, as the UI would then accurately reflect the actual state of the data on the server.

Here's how you might modify your code to handle this:

async function completeGoal(id: number, completed: string, target: any) {
    let originalSrc = target.parentElement.firstElementChild.src;
    let originalClassList = [...target.parentElement.children[2].classList];

    if (target.dataset.goalcomplete == 'yes') {
        target.parentElement.firstElementChild.src = "tikedfilled.svg";
        target.parentElement.children[2].classList.add('goal-completed');
    }
    else if (target.dataset.goalcomplete == 'no') {
        target.parentElement.firstElementChild.src = "tikbox.svg";
        target.parentElement.children[2].classList.remove('goal-completed');
    }

    try {
        const response = await fetch(`/api/goals/${id}`, {
            method: 'PATCH',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({ completed }),
        });

        if (!response.ok) {
            throw new Error('Network response not ok');
        }
#

repopulateGoals();
}
catch (error) {
console.error('Error: ', error);
// Revert UI changes
target.parentElement.firstElementChild.src = originalSrc;
target.parentElement.children[2].classList = originalClassList;
}
}


In this modified version of your code, we save the original `src` and `classList` before making any changes to the UI. Then, if the fetch request fails, we revert the `src` and `classList` to their original values.

Please note that this is a general approach and might need adjustments based on your specific use case and environment.
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#

@strange ledge kapa.ai is still learning and improving, please let us know how it did by reacting below

strange ledge
#

@pallid verge no change to the ui speed, can it be an image is slowing it down?

pallid vergeBOT
#

Let me check the knowledge base for you. One moment! :books:

#

Yes, it's possible that images could be slowing down your UI, especially if they are large in size or if there are many of them. Loading images can be a resource-intensive process that can slow down the rendering of your UI.

In the knowledge sources provided, there are several discussions about performance issues related to images. For example, in this issue (https://github.com/withastro/astro/issues/4321), users discuss how image optimization can significantly slow down build times. In another issue (https://github.com/withastro/astro/issues/5137), a user reports that local images are processed at every request in SSR mode, which can slow down the server response time.

There are several strategies you can use to optimize image loading:

  1. Use optimized images: Make sure your images are not larger than they need to be. You can use image compression tools to reduce the file size of your images without significantly reducing their quality.

  2. Lazy load images: Lazy loading is a technique where you delay the loading of images that are not immediately visible when the page loads. This can significantly improve the initial load time of your page.

  3. Use a CDN: A Content Delivery Network (CDN) can serve images faster by storing copies of your images on servers located closer to your users.

  4. Use the right image format: Different image formats have different strengths and weaknesses. For example, WebP offers better compression than JPEG or PNG, which can result in smaller file sizes.

  5. Use @astrojs/image for image optimization: Astro provides the @astrojs/image package for optimizing images. This package can generate multiple versions of each image at different sizes, and it can also convert images to more efficient formats like WebP.

#

Remember that these are general suggestions and the best approach depends on your specific use case and environment.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@strange ledge kapa.ai is still learning and improving, please let us know how it did by reacting below

strange ledge
#

@pallid verge I'm using a small svg so not sure how that can be impacting speed

pallid vergeBOT
#

Let me check the knowledge base for you. One moment! :books:

#

SVGs are generally not large in file size, especially compared to raster images like JPEGs or PNGs. However, there are still factors that could potentially cause an SVG to slow down your UI:

  1. Complexity: If your SVG has a lot of paths or elements, it could still be slow to render. This is because each path or element in the SVG requires calculation and rendering by the browser.

  2. Animation: If your SVG includes animations, these could potentially slow down your UI, especially if the animations are complex or if there are many of them.

  3. JavaScript: If your SVG includes embedded JavaScript, this could also slow down your UI. JavaScript execution is one of the most resource-intensive operations a browser can perform.

  4. CSS: Similarly, if your SVG includes complex CSS, this could also impact performance.

If you're experiencing performance issues with an SVG, you might want to consider simplifying the SVG if possible. For example, you could reduce the number of paths or elements, simplify or remove animations, or optimize any embedded JavaScript or CSS.

In the knowledge sources provided, there are several discussions about performance issues related to SVGs. For example, in this issue (https://github.com/withastro/astro/issues/9420), a user reports that Astro calculates SVG image width and height that is too small for SVGs using mm units. In another issue (https://github.com/withastro/astro/issues/958), a contributor suggests a way to make SVGs easier in your application with svg use.

Remember that these are general suggestions and the best approach depends on your specific use case and environment.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@strange ledge kapa.ai is still learning and improving, please let us know how it did by reacting below

strange ledge
#

@pallid verge should serverless functions always have a return statement? could that be why it is slow?

pallid vergeBOT
#

Let me check the knowledge base for you. One moment! :books:

#

Serverless functions should always return a response to the client. This is typically done using a return statement. If a serverless function doesn't return a response, the client will hang until a timeout occurs, which could be perceived as slowness.

The response usually includes a status code and a body. For example, in a Node.js serverless function, you might return a response like this:

return {
  statusCode: 200,
  body: JSON.stringify({ message: 'Success' }),
};

However, the absence of a return statement in a serverless function would not cause it to run slowly. Instead, it would cause the function to hang indefinitely (or until a timeout occurs), because the function never signals that it has completed execution.

If your serverless functions are running slowly, it could be due to a variety of factors, such as network latency, resource-intensive computations, or slow database queries. It's also worth noting that cold starts (i.e., the delay that occurs when a serverless function is invoked after not being used for a while) can also cause serverless functions to seem slow.

In the knowledge sources provided, there are several discussions about performance issues related to serverless functions. For example, in this issue (https://github.com/withastro/astro/issues/8829), users discuss the causes of long response times in Vercel serverless functions. In another issue (https://github.com/withastro/astro/issues/5489), a user reports an unknown application error that doesn't occur on edge functions.

Remember that these are general suggestions and the best approach depends on your specific use case and environment.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@strange ledge kapa.ai is still learning and improving, please let us know how it did by reacting below

strange ledge
#

@pallid verge for the code I provided and you modified should we add a return statement?

pallid vergeBOT
#

Let me check the knowledge base for you. One moment! :books:

#

In the context of serverless functions, it's important to return a response to the client. However, the code you provided doesn't seem to be a serverless function. It's a function that updates the UI and makes a fetch request to update data on the server.

In this case, the return statement is used to exit the function early if a certain condition is met (if found is not truthy). If you don't return from the function in this case, the rest of the code in the function will be executed, which might not be what you want.

Here's the modified version of your function with the return statement:

async function completeGoal(id: number, completed: string, target: any) {
    let originalSrc = target.parentElement.firstElementChild.src;
    let originalClassList = [...target.parentElement.children[2].classList];

    if (target.dataset.goalcomplete == 'yes') {
        target.parentElement.firstElementChild.src = "tikedfilled.svg";
        target.parentElement.children[2].classList.add('goal-completed');
    }
    else if (target.dataset.goalcomplete == 'no') {
        target.parentElement.firstElementChild.src = "tikbox.svg";
        target.parentElement.children[2].classList.remove('goal-completed');
    }

    try {
        const response = await fetch(`/api/goals/${id}`, {
            method: 'PATCH',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({ completed }),
        });

        if (!response.ok) {
            throw new Error('Network response not ok');
        }
#

repopulateGoals();
}
catch (error) {
console.error('Error: ', error);
// Revert UI changes
target.parentElement.firstElementChild.src = originalSrc;
target.parentElement.children[2].classList = originalClassList;
return; // Return from the function if an error occurs
}
}


In this modified version of your code, we return from the function in the catch block if an error occurs. This is because if an error occurs, we probably don't want to continue executing the rest of the code in the function.
----------------------
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------
#

@strange ledge kapa.ai is still learning and improving, please let us know how it did by reacting below

strange ledge
#

@pallid verge how do i troubleshoot netlify serverless functions in my astro code

pallid vergeBOT
#

Let me check the knowledge base for you. One moment! :books:

#

Troubleshooting Netlify serverless functions in your Astro code involves several steps:

  1. Check the function logs: Netlify provides detailed logs for each function invocation. These logs can help you identify any errors or issues that occurred during the execution of your function.

  2. Debug locally: You can use Netlify CLI to run your functions locally. This allows you to test your functions in a local environment before deploying them to Netlify. You can also use traditional JavaScript debugging tools, like console.log(), to output debug information from your functions.

  3. Check your function's configuration: Make sure your function is correctly configured in your netlify.toml file. For example, if you're using a specific runtime or environment variables, make sure these are correctly specified in your configuration.

  4. Check your function's dependencies: If your function depends on any external Node.js modules, make sure these are correctly installed and imported in your function. If you're using a bundler like webpack or rollup, make sure your function is correctly bundled.

  5. Debugging with console.log(): Astro provides several different tools to help you troubleshoot and debug your code. console.log() is a simple-but-popular method of debugging your Astro code. Where you write your console.log() statement will determine where your debugging output is printed. A console.log() statement in Astro frontmatter will always output to the terminal running the Astro CLI. Code that is written or imported inside of an Astro <script> tag is run in the browser. Any console.log() statements or other debug output will be printed to the console in your browser. source (https://docs.astro.build/en/guides/troubleshooting/#_top)

#
  1. Check for known issues: Check the Astro GitHub issues (https://github.com/withastro/astro/issues) to see if anyone else has reported a similar problem. For example, there have been issues reported with Astro SSR failing to bundle functions for Netlify. source (https://github.com/withastro/astro/issues/3469)

Remember, these are general suggestions and the best approach depends on your specific use case and environment.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@strange ledge kapa.ai is still learning and improving, please let us know how it did by reacting below

strange ledge
#

@pallid verge am I missing some return statements or other issues with this code?

export const PATCH: APIRoute = async (ctx) => {
    try {
        const id = Number(ctx.params.id);
        if (!id) {
            return new Response('goal id not foundl',{ status: 400 });
        }
        let goal = await db.select().from(Goals).where(eq(Goals.id,id));
        let goalCompletedValue = goal[0].completed;
        if (goalCompletedValue === 'no') {
            await db.update(Goals).set({ completed: 'yes' }).where(eq(Goals.id,id));
        }
        else if (goalCompletedValue === 'yes') {
            await db.update(Goals).set({ completed: 'no' }).where(eq(Goals.id,id));
        }
        else {
            console.log('the goal completed value is something other than no or yes');
        }
        return new Response(null, { status: 204 });
    }
    catch (error) {
        console.log('patch not routing');
        return new Response('somethings not right',{ status: 500 });
    }
};
pallid vergeBOT
#

Let me check the knowledge base for you. One moment! :books:

#

Your code seems to be correctly structured and all the necessary return statements are present. Here's a brief overview of what your code does:

  1. It tries to convert the id from the context parameters to a number. If the id is not a number, it returns a 400 status code with a message.

  2. It then fetches a goal from the database using the id.

  3. Depending on the completed value of the goal, it updates the completed field in the database.

  4. If the completed value is neither 'yes' nor 'no', it logs a message.

  5. Finally, it returns a 204 status code indicating that the request was successful but there's no content to send back.

  6. If any error occurs during this process, it logs a message and returns a 500 status code with a message.

This seems to be a correct way to handle a PATCH request in a serverless function. However, if you're experiencing issues, you might want to add more detailed logging to help troubleshoot. For example, you could log the id, the goal, and the error to get more information about what's happening.

Also, ensure that your database queries are working as expected. You might want to check the results of the select and update queries to make sure they're returning the expected results.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: