Components: Expansion panel open by default

[ImranAhmed]

Bug, feature request, or proposal:

I've been searching for a way to open the open expansion panel by default, very little in the documentations, is this possible or shall we raise as a feature request?

[ppham27]

You can do:

<md-expansion-panel [expanded]="true">
  <!-- Your content here. -->
</md-expansion-panel>

[ImranAhmed]

Thanks, perfect!

[ted-sandbox]

easy peasy, thanks for the tip.

[ORESoftware]

doesn't that mean it's always expanded? or just initially expanded?

[DukeCaesar]

Adding [expanded]="true" to mat-expansion-panel will expand the panel initially. You can still collapse it when you click the toggle header.

[pcnate]

is this documented on http://material.angular.io?

[aloketewary]

Yes in API there is _@ Input_ part where you can see it. Follow the docs @pcnate
https://v5.material.angular.io/components/expansion/api#MatExpansionPanel

[YuvrajSagarRana]

how to open mat-expansion in upward direction?

[bullcrane]

Since merely assigning true, rather than doing anything to it programmatically, this also works:

<md-expansion-panel expanded>
  <!-- Your content here. -->
</md-expansion-panel>

[yannanna0920]

如果是循环md-expansion-panel呢 这样加expanded 会报错 也只默认最后一个是展开的 有遇到这种情况德吗（What if it's a loop called md-expansion panel so expanded will report an error and it will simply expand the last one by default. Is that the case）

[hirocsingh]

How can I expand all the expansion-panel by default? [expanded]="true" only works for one panel whichever is the latest.

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