问题 I have an input and the type is number. I want to set min and max, if the input is out of this range (< min or >max), the error will be displayed. My problem is that if the input is not empty but invalid, the error disappears (example: min =10, max =20, input =2000, still no error displays). I search on this site and there is a post about validation but the solution is to use < md-input-container> and < md-error>. I don't want to use < md-input-container> and < md-error>. Reference:here Is