What is the best way to allocate 40% of a view's height in Ionic?

How can I set the height to 40% of the view in Ionic? I want my code to run on all screen resolutions, so I am using a percentage for the view height. However, when I set it to 40%, it takes up less space than expected. On the other hand, setting it to 200% takes up more space. Why isn't it taking up 40% of the specified space?

Below is the CSS code I have used:

.a {
  height: 200% !important;
  border: 1px solid red;
  padding-top: 1%;
}

When I set the height to 40%, it takes up less space. It should actually take up 40% of the screen resolution. Can someone help me identify the issue with my code?

javascriptangularjsangularjs-directiveionic-framework

Answer №1

One way to make elements scale relative to the size of the viewport (the actual screen size) is by using the vw/vh units, which are new units introduced in CSS3.

For example, you can use 40vh to set an element's height to be exactly 40% of the screen height.

.a {
  height:40vh !important;
/* width:80vw;*/
  border :1px solid red;
  padding-top:1%;
}

,

Answer №2

It's important to recognize the timing of CSS application in web browsers.

CSS is applied as soon as the Document Object Model (DOM) is loaded. This doesn't necessarily coincide with when your template is inserted into the BODY element. So, when the DOM loads, the browser tries to apply your CSS while your HTML template is still within the script element. The height specified as 40% will only be effective if there is already a parent element present with a defined height at the time the CSS is applied. In this scenario, the parent element initially is a script tag and the browser will continue up the DOM tree until it reaches an element with a height, applying 40% of that height.

A potential solution is to calculate the parent's height after rendering the template and dynamically set the child element's height to 40% of the parent's height once it has been added to the DOM.

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