Discovering the height of an element, including its margin

Currently, I am working on a drawing app that is designed to be simple and enjoyable. The app's structure consists of:

  • Header
  • Canvas
  • Footer

One challenge I have encountered involves setting the canvas height to occupy the entire window but excluding the heights of the header and footer.

I've attempted various methods such as:

canvas.height = window.height - (document.getElementById("header").offsetHeight + document.getElementById("footer").offsetHeight);

Additionally, I experimented with:

function getHeight(id) {
    id = document.getElementById(id);
    return id.offsetHeight + id.style.marginTop + id.style.marginBottom;
}

canvas.height = window.height - (getHeight("header") + getHeight("footer"))

Unfortunately, these approaches did not yield the desired outcome. When using id.style.marginTop, the console returned an empty string despite the margin being defined in the CSS style as margin: 8px 0 8px 0;.

Is there a way, without relying on jQuery, to retrieve the actual height of an element including its margin?

I suspect we may need to extract individual values from margin: 8px 0 8px 0; by utilizing id.style.margin. However, I am uncertain about the exact approach to achieve this separation.

javascripthtmlcss

Answer №1

function getOuterWidth(element) {
  var width = element.offsetWidth;
  var style = window.getComputedStyle(element);

  width += parseInt(style.marginLeft, 10) + parseInt(style.marginRight, 10);
  return width;
}

This function replicates the functionality of jQuery's outerWidth method. It was adapted from a resource found at . This could be useful for future development projects.

UPDATE: For compatibility with Internet Explorer 8, use el.currentStyle[prop] instead of getComputedStyle(el);

Answer №2

One approach is to utilize a flex method and avoid the hassle of height calculations:

CSS:

.container {
  display: flex;
  flex-direction: column;
  height: 100%;
}

canvas {
  flex: 1;
}

HTML:

<div class="container">
  <header>...</header>
  <canvas>...</canvas>
  <footer>...</footer>
</div>

Fiddle

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