Transforming JavaScript to TypeScript in Angular: encountering error TS2683 stating that 'this' is implicitly of type 'any' due to lacking type annotation

While in the process of migrating my website to Angular, I encountered an error when attempting to compile the JS into TS for my navbar. After searching around, I found similar issues reported by other users, but their situations were not quite the same.

Below is the complete script with comments indicating where the error occurs:

document.addEventListener("DOMContentLoaded", function(event) {

  const showNavbar = (toggleId, navId, bodyId, headerId) => {
    const toggle = document.getElementById(toggleId),
      nav = document.getElementById(navId),
      bodypd = document.getElementById(bodyId),
      headerpd = document.getElementById(headerId)

    // Make sure all variables exist
    if (toggle && nav && bodypd && headerpd) {
      toggle.addEventListener('click', () => {
        // show navbar
        nav.classList.toggle('show')
        // change icon
        toggle.classList.toggle('bx-x')
        // add padding to body
        bodypd.classList.toggle('body-pd')
        // add padding to header
        headerpd.classList.toggle('body-pd')
      })
    }
  }

  showNavbar('header-toggle', 'nav-bar', 'body-pd', 'header')

  /*===== LINK ACTIVE =====*/
  const linkColor = document.querySelectorAll('.nav_link')

  function colorLink() {
    if (linkColor) {
      linkColor.forEach(l => l.classList.remove('active'))
      this.classList.add('active') //error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
    }
  }
  linkColor.forEach(l => l.addEventListener('click', colorLink))

  // Your code to run since DOM is loaded and ready
});

Any assistance on resolving this issue would be greatly appreciated.

Thank you

EDIT

I later discovered that the entire section regarding 'linkcolor' was managed through my navbar script using the angular routerLinkActive feature. By removing the entire 'link active' portion from this script, I encountered no further problems. Thank you all for your help.

Answer №1

If you're encountering issues with your click function, it may be necessary to specify the type within it.

function handleClick(this: HTMLElement) {
console.log("Clicked!");
this.removeEventListener("click", handleClick);
}

Answer №2

Utilize the event parameter given to your callback function. This will allow you to access event.currentTarget and determine which link_color element was clicked.

  function colorLink(event: Event) {
    if (linkColor) {
      linkColor.forEach(l => l.classList.remove('active'))
      event.currentTarget.classList.add('active') //error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
    }
  }

Refer to the documentation for Event.currentTarget for further details.

In addition, this method is compatible with both arrow functions and traditional functions...

  const colorLink = (event: Event) => {
    if (linkColor) {
      linkColor.forEach(l => l.classList.remove('active'))
      event.currentTarget.classList.add('active') //error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
    }
  };

Answer №3

function colorLink() {
    if (linkColor) {
      linkColor.forEach(l => l.classList.remove('active'))
      this.classList.add('active') //error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
    }
}

Rewrite the above function as an arrow function. Note that the this keyword is in the function scope, not the event listener scope.

Arrow function version:

const colorLink = () => {
    if (linkColor) {
      linkColor.forEach(l => l.classList.remove('active'))
      this.classList.add('active') //error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
    }
}

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