Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript Manage Multiple Requests with Promise.all

2 Answers

Steven Parker
Steven Parker
231,248 Points

On line 35, there's a call to "Promise.resolve" with no argument. But it should be:

        return Promise.resolve(response);

How can I solve "content.js:2 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'debugMode')"

const select = document.getElementById('breeds'); const card = document.querySelector('.card'); const form = document.querySelector('form');

// ------------------------------------------ // FETCH FUNCTIONS // ------------------------------------------ function fetchData(url){ return fetch(url) .then(checkStatus) .then(res=>res.json()) .catch(error => console.log('Looks like there was a problem',error)) }

Promise.all([ fetchData('https://dog.ceo/api/breeds/list'), fetchData('https://dog.ceo/api/breeds/image/random')

]) .then(data =>{ const breadList = data[0].message; const randomImage = data[1].message;

 generateOperations(breadList);
 generateImage(randomImage);

 })         

// ------------------------------------------ // HELPER FUNCTIONS // ------------------------------------------ function checkStatus(response){ if (response.ok){ return Promise.resolve(response); }else{ return Promise.reject(new Error(response.statusText));statusText }

}

function generateImage(data){ const html =`

<img src="${data}" alt="${select.value}s">

<p>Click to view images of ${select.value}s</p>`;

card.innerHTML =html; }

function generateOptions(data){ const options =data.map(item=> <option value="${item}">${item}</option>).join('');

select.innerHTML =options; }

function fetchBreedImage(){ const breed = select.value; const img = card.querySelector('img'); const p = card.querySelector('p');

fetchData(https://dog.ceo/api/breed/${breed}/images/random) .then(data =>{ img.src=data.message; img.alt= breed; p.textContent=Click to view more ${breed}s; });

}

// ------------------------------------------ // EVENT LISTENERS // ------------------------------------------ select.addEventListener('change',fetchBreedImage); card.addEventListener('click',fetchBreedImage);

Steven Parker
Steven Parker
231,248 Points

When you need help, always create a new question instead of posting one as an answer or comment to someone else's. And for sharing your code, make a snapshot of your workspace and post the link to it (as was done by the original poster).