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JavaScript DOM Scripting By Example Adding and Removing Names Practice with Function Scope

Thomas H
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Thomas H
Full Stack JavaScript Techdegree Student 4,545 Points
Posted by Thomas H
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Thomas H
Full Stack JavaScript Techdegree Student 4,545 Points

practice with function scope

Hi coders !

I'm stuck with this exercise and i dont get exactly how to change the event refering to a outside scope.

Im looking for more on courses,but can you give me a hint ?

Thank you

app.js 
const redButton = document.getElementById('redButton');
const blueButton = document.getElementById('blueButton');

redButton.addEventListener('click', (e) => {
  const colorSquare = document.getElementById('colorDiv');
  colorSquare.style.backgroundColor = 'red';
});

blueButton.addEventListener('click', (e) => {
  blueButton.style.backgroundColor = 'blue';
})
style.css 
div {
  height: 50px;
  float: left;
  padding-top: 40px;
  padding-left: 20px;

}

#colorDiv {
  padding: 0;
  width: 100px;
  height: 100px;
  background-color: gray;
}

button {
  height: 30px;
  border-radius: 10px;
}
#redButton {
  background-color: #ff5959;
  border-color: red;
}

#blueButton {
  background-color: lightblue;
  border-color: #7C9EFC;
}

2 Answers

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

The red button is working because it defines "colorSquare", but since the definition is limited to its own scope, it can't be accessed from the blue button handler.

But if you move that line of code outside of the function, and put it with the other global declarations at the top, it will be be accessible by both handler functions.