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updated js demo readme

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Micah Godbolt
2019-03-01 15:56:55 -08:00
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step1-03/exercise/README.md
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## Exercise
If you don't already have the app running, start it with `npm run static` from the root of the `frontend-bootcamp` folder. Click the "exercise" link under day 1 step 3 to see results.
Open up the [Todo JavaScript Exercise Page](http://localhost:8080/step1-03/exercise/)
Open the `index.html` file in this exercise folder.
### Update Navigation
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### Complete the `updateRemaining` function
1. Get a reference to the span with the `remaining` class, and store it in a variable.
1. Using `querySelector`, get a reference to the span with the `remaining` class, and store it in a variable .
2. Use [`querySelectorAll`](https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelectorAll) to get all of the todos.
3. Set the `innerText` of the remaining span to the length of those todos.
4. Add `updateRemaining()` to the end of the `addTodo` function.