Angular 2 material and flex-layout alignment - css

Question

I am trying to use angular 2 material and flex-layout to create a responsive gallery of elements. After hours and hours, I still can't have my elements centered:
This is the source code:
<div fxLayout='row' fxLayoutWrap fxLayoutGap="2rem">
<md-card fxFlex.gt-md="20" fxFlex.md="28" fxFlex.sm="40" fxFlex.xs="100" *ngFor="let recipe of recipes" [routerLink]="['/details', recipe.id]" class="recipe-card">
<md-card-header>
<md-card-title>element</md-card-title>
</md-card-header>
<img md-card-image src="http://placehold.it/350x200">
<md-card-content>
<p>
Lorem Ipsum
</p>
</md-card-content>
</md-card>
</div>
I have tried different values for fxFlexAlign (https://github.com/angular/flex-layout/wiki/API-Documentation) but none of them achieves what I need, that is, having the elements centered or, in other words, distribute the red square space between the right and the left side.
Is there a way of achieving this?
EDIT
Unfortunately, justify-content: space-between; doesn't work if I have a dynamic number of items. Eventually, they will be wrapped in a new line, and then the item in the last row won't look as expected:
.container {
display:flex;
width:100%;
flex-flow:row wrap;
justify-content: space-between;
}
.block {
width:100px;
height:100px;
border:1px solid red;
}
<div class="container">
<div class="block" fxLayout='row' fxLayoutWrap fxLayoutGap="2rem">
... you content
</div>
<div class="block" fxLayout='row' fxLayoutWrap fxLayoutGap="2rem">
... you content
</div>
<div class="block" fxLayout='row' fxLayoutWrap fxLayoutGap="2rem">
... you content
</div>
<div class="block" fxLayout='row' fxLayoutWrap fxLayoutGap="2rem">
... you content
</div>
<div class="block" fxLayout='row' fxLayoutWrap fxLayoutGap="2rem">
... you content
</div>
<div class="block" fxLayout='row' fxLayoutWrap fxLayoutGap="2rem">
... you content
</div>
<div class="block" fxLayout='row' fxLayoutWrap fxLayoutGap="2rem">
... you content
</div>
<div class="block" fxLayout='row' fxLayoutWrap fxLayoutGap="2rem">
... you content
</div>
</div>

Answer 1

<div fxLayout="row" fxLayoutWrap fxLayoutGap="2rem" fxLayoutAlign="center">
Adding fxLayoutAlign="center" worked out for me, the results are now positioned in center.

Answer 2

You can try this concept to acheive a similar functionality. You may have to edit css % values to get more perfect results.
.sp{
display: flex;
justify-content: center;
}
.i{
width: 23%;
height: 133px;
background-color: grey;
margin: 3px;
color: #fff;
}
.p{
display: flex;
flex-wrap: wrap;
width: 56%;
}
<div class="sp">
<div class="p">
<div class="i"> content </div>
<div class="i"> content </div>
<div class="i"> content </div>
<div class="i"> content </div>
<div class="i"> content </div>
<div class="i"> content </div>
<div class="i"> content </div>
<div class="i"> content </div>
<div class="i"> content </div>
<div class="i"> content </div>
</div>
</div>

Answer 3

Late to answer but its work on dynamic item, i can't find the exact formula
my formula is
margin-bottom = (100 - (total item in row * fxFlex on item)) / total space between item in row
Example
margin-bottom = (100 - (5 * 19) ) / 4
margin-bottom = (100 - 95) / 4
margin-bottom = 5 / 4 = 1.25%
On Your Code
HTML
<div fxLayout="row" fxLayoutWrap="wrap" fxLayoutAlign="space-between">
<!-- margin-bottom = gt-md = 1.25%, md = 6.5% , sm = 22% !-->
<md-card fxFlex.gt-md="19" fxFlex.md="29" fxFlex.sm="39" fxFlex.xs="100" *ngFor="let recipe of recipes" [routerLink]="['/details', recipe.id]" class="recipe-card">
<md-card-header>
<md-card-title>element</md-card-title>
</md-card-header>
<img md-card-image src="http://placehold.it/350x200">
<md-card-content>
<p>
Lorem Ipsum
</p>
</md-card-content>
</md-card>
</div>
CSS
md-card {
margin-bottom: 6.25%; // md flex 29
// this commented margin is the responsive margin calculation you must implement
// margin-bottom: 1.25%; // gt-md flex 19
// margin-bottom: 22%; // sm flex 39
// margin-bttom : 2%; // sm flex 49 better use this one
}