In Angular 1 Material I could use a directive, right now it is an attribute, right now it is very hard to do. How can I do it simply to only show the tooltip like when the width of page is small and hide when it is big?
I cannot find. It is not possibly to use like:
<md-tooltip ngIf="false">sometimes hidden</md-tooltip>
If I understand your request correctly you want to show tooltip only when a certain condition is met, try this:
<div [matTooltip]="isWide ? 'Visible' : null"></div>