Can TypeScript be imported into HTML to set a color value or modify a color value from HTML using TypeScript?

Question

Can TypeScript be imported into HTML to set a color value or modify a color value from HTML using TypeScript?

I've been working on this code for a couple of days now. Utilizing Angular to develop a web application, I am trying to change the color of certain numbers when they reach a specific value. For example, if num > 45 then color = green, otherwise color = red. I want to pass the color value between my TypeScript and HTML files, but I'm encountering difficulties with that. The color value passes to HTML correctly, but I'm unable to style it in any way. Here's my code. Appreciate any assistance!

Typescript:

colorOption=''

if(this.Classyaverage > 45){
  console.log('red')
  this.colorOption='#FF0000'
}
else{
  console.log('green')
  this.colorOption='#00FF00'
}

HTML:

<body>
    <div class="pagecolor">

    <div class="box">

      <canvas class="offset"
      id="lineChart" 
      width="240"
      height="180" 
      >
      </canvas>

      //This is what I want...

      <style>
       h1{ color:{{colorOption}};}
      </style>

      <h1>
        {{Classyaverage}}
      </h1>

    </div>

  </div>
</body>

If importing a TypeScript file like this isn't feasible, is there a way to export HTML or CSS into TypeScript?

html css angular typescript

Answer 1

Answer №1

Define a CSS class to set the color:

.myColor {
    color: var(--colorVariable);
}

Set the value of the CSS variable from TypeScript based on your requirements like this:

document.documentElement.style.setProperty( '--colorVariable', '#00FF00' );

This can be adjusted using calculations or events within the application.

Answer 2

Define a CSS class to set the color:

.myColor {
    color: var(--colorVariable);
}

Set the value of the CSS variable from TypeScript based on your requirements like this:

document.documentElement.style.setProperty( '--colorVariable', '#00FF00' );

This can be adjusted using calculations or events within the application.

Answer 3

Answer №2

To get the desired outcome, apply ngStyle to the h1 element (https://angular.io/api/common/NgStyle)

  <h1 [ngStyle]="{'color': selectedColor}">
    {{DynamicAverage}}
  </h1>

Answer 4

To get the desired outcome, apply ngStyle to the h1 element (https://angular.io/api/common/NgStyle)

  <h1 [ngStyle]="{'color': selectedColor}">
    {{DynamicAverage}}
  </h1>

Answer 5

Answer №3

If you're searching for the solution, I believe the ngClass directive is what you need. You can find the detailed documentation about it on Angular's official website.

// .css

.red{
  color: #f00;
} 

.green: {
 color: #0f0
}

-

// .html

<h1 [ngClass]="{'red': Classyaverage > 45, 'green': Classyaverage <= 45}"></h1>

Answer 6

If you're searching for the solution, I believe the ngClass directive is what you need. You can find the detailed documentation about it on Angular's official website.

// .css

.red{
  color: #f00;
} 

.green: {
 color: #0f0
}

-

// .html

<h1 [ngClass]="{'red': Classyaverage > 45, 'green': Classyaverage <= 45}"></h1>

Answer 7

Answer №4

If you find yourself in need of styling multiple elements, there is a way to achieve that easily.

Here's an example:

<h1 class="color-change">
  {{Classyaverage}}
</h1>
<h2 class="color-change" *ngFor"let el of arr">
  test
</h2>

To handle this in TypeScript:

@ViewChildren(".color-change") private colorChange: QueryList<ElementRef>;
constructor(private renderer: Renderer2) { }
ngAfterViewInit(): void {
  this.colorChange.subscribe(() => 
    this.colorChange.forEach((element: ElementRef) => {
      this.renderer.setStyle(
        element.nativeElement,
        'color',
        this.colorOption
      })
    })
  );
}
...

This method works well for both numerous and asynchronous elements.

Answer 8

If you find yourself in need of styling multiple elements, there is a way to achieve that easily.

Here's an example:

<h1 class="color-change">
  {{Classyaverage}}
</h1>
<h2 class="color-change" *ngFor"let el of arr">
  test
</h2>

To handle this in TypeScript:

@ViewChildren(".color-change") private colorChange: QueryList<ElementRef>;
constructor(private renderer: Renderer2) { }
ngAfterViewInit(): void {
  this.colorChange.subscribe(() => 
    this.colorChange.forEach((element: ElementRef) => {
      this.renderer.setStyle(
        element.nativeElement,
        'color',
        this.colorOption
      })
    })
  );
}
...

This method works well for both numerous and asynchronous elements.

Can TypeScript be imported into HTML to set a color value or modify a color value from HTML using TypeScript?

Answer №1

Answer №2

Answer №3

Answer №4

Similar questions

Is placing JavaScript on the lowest layer the best approach?

I'm having trouble getting my paragraph to center with both Bootstrap 4's margin:auto and text

Ways to prevent the selection of images

Iterate through the complex array of nested objects and modify the values according to specified conditions

How can I replace the unsightly "Web page not available" error in WebView on Android with a more visually pleasing alternative?

Preserving quotation marks when utilizing JSON parsing

I prefer showcasing the contents at the top of the page instead of the bottom

Troubleshooting a 400 Bad Request Error when calling ValidateClientAuthentication in ASP.NET WebApi, even after using context.Validated()

Utilizing Custom Script Tag Types in Visual Studio for Enhanced HTML Template Functionality and Improved Syntax Highlighting

I encountered a mistake: error TS2554 - I was expecting 1 argument, but none was given. Additionally, I received another error stating that an argument for 'params' was not provided

What is the best way to execute a method in a component for each iteration in an *ngFor loop in Angular 2

Sorting an object array by date is causing a problem

Tips on causing JavaScript execution to halt until an element has finished rendering

Unable to apply inset box-shadow to image

typescript set parameter conditionally within a function

Displaying a value in a React component using material-ui's TextField

Adjusting the focal point of a brochure on open street map

Having trouble setting up Typescript in VisualStudio 2015 due to the error message "exports is not defined"? Need guidance on the correct setup?

Is it considered the most appropriate method to implement a dynamic web page refresh by utilizing PHP, HTML, and AJAX in order to read a

Using Python to extract the title of a hyperlink from an HTML website