Angular 2 Material - How To Center Progress Spinner

Question

I have implemented the Angular 2 progress spinner from the below link

https://github.com/angular/material2/tree/master/src/lib/progress-spinner

I would like to have it centered, however, the only way I can seem to get it to work is to remove the

display: block 

from the CSS. However, this causes the spinner to appear huge on the page.

Any advice would be great.

Answer 1

just add margin rule:

<md-progress-spinner style="margin:0 auto;" 
                     mode="indeterminate"></md-progress-spinner>

plunker: http://plnkr.co/edit/sEiTZt830ZE7rqjq9YXO?p=preview

UPDATE

Just wanted to share and demonstrate 5 other general centering solutions

• FLEX:

.wrapper {
  display: flex; 
  justify-content: center; 
  align-items: center;
  height: calc(100vh - 20px);
  background: red;
}
.inner {
  background: green;
  color: white;
  padding: 12px;
}

<div class="wrapper">
  <div class="inner">INNER CONTENT</div>
</div>

• GRID:

.wrapper {
  display: grid; 
  place-items: center;
  height: calc(100vh - 20px);
  background: red;
}
.inner {
  background: green;
  color: white;
  padding: 12px;
}

<div class="wrapper">
  <div class="inner">INNER CONTENT</div>
</div>

• LINE HEIGHT + TEXT ALIGN (will not work as desired for multiple lines, use white-space: nowrap; to ensure one line)

.wrapper {
  line-height: calc(100vh - 20px);
  text-align: center;
  background: red;
  white-space: nowrap;
}
.inner {
  background: green;
  color: white;
  padding: 12px;
  display: inline;
}

<div class="wrapper">
  <div class="inner">INNER CONTENT</div>
</div>

• USING ABSOLUTE, TOP, LEFT and TRANSFORM TRANSLATE

.wrapper {
  height: calc(100vh - 20px);
  background: red;
  position: relative;
}
.inner {
  background: green;
  color: white;
  padding: 12px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

<div class="wrapper">
  <div class="inner">INNER CONTENT</div>
</div>

• USING ABSOLUTE, TOP, LEFT, BOTTOM, RIGHT and MARGIN AUTO (mentioned by György Balássy). Note: inner div width needs to be set.

.wrapper {
  height: calc(100vh - 20px);
  background: red;
  position: relative;
}
.inner {
  background: green;
  color: white;
  padding: 12px;
  position: absolute;
  inset: 0;
  margin: auto;
  height: max-content;
  width: max-content;
}

<div class="wrapper">
  <div class="inner">INNER CONTENT</div>
</div>

Answer 2

This CodePen helped me to create a page-centered spinner with Material Design in Angular 4: https://codepen.io/MattIn4D/pen/LiKFC

Component.html:

<div class="loading-indicator">
  <mat-progress-spinner mode="indeterminate" color="accent"></mat-progress-spinner>
</div>

Component.css:

/* Absolute Center Spinner */
.loading-indicator {
  position: fixed;
  z-index: 999;
  height: 2em;
  width: 2em;
  overflow: show;
  margin: auto;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}

/* Transparent Overlay */
.loading-indicator:before {
  content: '';
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.3);
}