Angular 2 Show and Hide an element

Angular 2 Show and Hide an Element: Easy Solutions and Common Issues 📝💡

Are you struggling to show and hide an element depending on a boolean variable in Angular 2? 🤔 Don't worry, you're not alone! Many developers encounter this issue when working with Angular. In this blog post, I'll walk you through common problems and provide easy solutions to help you achieve the desired behavior. Let's dive in! 💻🚀

The Issue at Hand 📜

As mentioned by our frustrated developer, the element is initially hidden when the saveTodos() function starts. However, after 3 seconds, even if the edited variable returns to false, the element doesn't hide. 😞 This unexpected behavior can be quite confusing. Let's understand why this is happening and how we can overcome it.

Understanding the Problem 🕵️‍♂️

The cause of this issue lies in the use of the setTimeout() function. When you use setTimeout(), a new anonymous function is created, which creates its own separate scope. Consequently, within this new scope, this.edited loses its reference to the original edited variable in the component. Therefore, when you attempt to set this.edited to false, it doesn't affect the original variable, leading to the element not hiding as expected. 😵

Solution: Utilizing Arrow Functions 🏹

To fix this issue, we can leverage Arrow Functions in JavaScript, which retain the scope of the surrounding code. By using an arrow function, we can ensure that this.edited refers to the correct variable and achieve the desired behavior. Let's see how this can be implemented. 🛠💡

saveTodos(): void {
  // Show box msg
  this.edited = true;

  // Wait 3 Seconds and hide
  setTimeout(() => {
    this.edited = false;
    console.log(this.edited);
  }, 3000);
}

By replacing the function() inside setTimeout() with the Arrow Function () => {}, we can now access the edited variable from the component correctly. This ensures that when this.edited is set to false, it updates the original variable, triggering the element to hide. 🎉

Test It Out! ✅

After implementing this fix, give it a go! Execute the saveTodos() function and observe the element's behavior. Now, it should show when the function starts and hide after 3 seconds elapse, regardless of the value of the edited variable.

Sharing Is Caring! 🤝💬

I hope this blog post helped you resolve the issue of showing and hiding an element based on a boolean variable in Angular 2. If you found it useful, don't keep it to yourself! Share it with your fellow developers who might be struggling with the same problem. Together, we can make coding easier and more enjoyable for everyone! ❤️

Also, feel free to leave a comment below if you have any questions, suggestions, or would simply like to share your thoughts. Let's engage in a meaningful conversation! 🗯️👇

Happy coding! 💻🙌