Using Javascript to change CSS in a Polymer application

Coming from a background in angular and react, I am now delving into the world of polymer.

I have a polymer class called myClass with the following template.

<div  id="[[x]]">

Here, 'x' is a property defined in a property getter.

  static get properties() {
    return {      
      x: {
        type: Number,
        value: 200
      }
}

If I dynamically set the value of 'x' using the Chrome dev tools console, like myClass.x = '5', it works perfectly and the output will be:

<div  id="5">

The same applies for other HTML attributes such as:

   <div  width="[[x]]">
   <div  height="[[x]]">

Now, let's consider a situation where I want to give a margin property dynamically to my div in the same way I did with id, width, and height. How can I achieve this in Polymer?

In angular, we would do something like this:

<div [style.marginTop.px]="marginTop">

I'm curious to hear how you would tackle this in a Polymer context. Share your thoughts!

Answer №1

Achieving it is possible through a method similar to this.

<div style$="margin:{{ x }}px;">

Answer №2

One alternative method is to utilize CSS variables:

:root {
    --custom-margin-top: 20px;
}

div {
    margin-top: var(--custom-margin-top);
}

Another way is through JavaScript:

updateMarginTop(marginTop) {
    this.updateStyles({
        '--custom-margin-top': `{marginTop}px`
    });
}

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