html - md-select - how to force required? -

how force md-select in multiple mode behave like

<select multiple required ... >

here fiddle, show mean. in example, browser doesn't let me submit form without selecting @ least 1 option select tag.

i want md-select behave similarly, don't know how can - neither putting 'required' attribute nor adding 'ng-require' directive helps.

you can rely on angular validation this, rather browser. here's forked example:

specifically:

<button type="submit" ng-disabled="myform.$invalid">submit</button>

to keep submit button disabled until form valid and,

<form novalidate name="myform">

to name form , tell browser not own validation on it.

you add css class ng-invalid show red around invalid fields.

edit: make sure put ng-model on <select multiple>, otherwise required attribute won't work.

Yet