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25 lines
1.3 KiB
Markdown
25 lines
1.3 KiB
Markdown
## Exercise
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### Update Navigation
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1. Add an `onclick` attribute to all three buttons in the navigation.
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2. In each `onclick` call the `filter` function. In our function we need a reference to the clicked button, so pass in the keyword `this` as the only parameter.
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### Write an `updateRemaining` function
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1. Get a reference to the span with the `remaining` class, and store it in a variable.
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2. Use [`querySelectorAll`](https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelectorAll) to get all of the todos.
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3. Set the `innerText` of the remaining span to the length of those todos.
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4. Add `updateRemaining()` to the end of the `addTodo` function.
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### Write a `clearCompleted` function
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1. Get a reference to all of the todos with [`querySelectorAll`](https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelectorAll).
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2. Use a `for (let todo of todos)` loop to iterate over each todo.
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3. Inside the for loop write an `if` statement to test if the `input` inside of the todo has a checked value of true.
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> Hint: you can use `querySelector` on any HTML element to find matching child elements.
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4. Call `todo.remove()` for any todo whose input is checked.
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5. After the loop is done, run `updateRemaining()`.
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6. Attach `clearCompleted()` function to the `onclick` of the footer button.
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7. Test it out!
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