How can you ensure an element's height matches its width within an Ionic framework?

I am currently creating an application using the Ionic framework, and I am looking to set a square image as the background. The challenge is to ensure that the image scales appropriately for different screen resolutions; ideally, it should occupy the full width of the device while maintaining its aspect ratio to determine its height.

Although I have attempted to incorporate a directive to calculate the correct height for the image, my efforts seem to be futile as the directive does not appear to be executing at all.

HTML

<ion-view view-title="Home" >
  <ion-content class >
    <div id="card" ng-model="card">
      <h3>{{card.name}}</h3>

    </div>
  </ion-content>
</ion-view>

CSS

#card{
    background-image: url("/img/education.png");
    background-size: 100% 100%;
    width: 100%;
}

Javascript (controllers.js)

.directive("card", function($scope) {
   console.log("Card directive initiated.");
   return {
        restrict: "E",
        link: function(scope, element) {
            console.log("Link activated");
            element.height = element.width;
        }
   }
})

Answer №1

In the world of web design, it's important to remember that a background image won't automatically define the size of an element like an <img> tag would. Fortunately, there are a couple of clever solutions at your disposal:

  1. Consider using an <img> element instead of relying solely on background-image. By doing so, the element will adjust its dimensions based on the size of the image itself (assuming the image is square).

  2. Alternatively, you can employ some sneaky CSS tricks. Let's say you want the .square element to be half the width of its parent container. Simply give it a width of 50%, a height of 0, and a padding-bottom of 50%.

    .square {
      width:50%;
      height:0px;
      padding-bottom:50%;
      background-size:  100% 100%;
    }
    

If you'd like to see these concepts in action, check out this demo.

Answer №2

One interesting css solution involves using the vw units.

If we consider 100% of the viewport as 100vw, then setting the height to 100vw would result in a square image because it matches the width of the viewport.

For more information, you can check out this link

To see which browsers support this feature, refer to this webpage

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