Web Reference: May 2, 2018 · Angular [disabled]="MyBoolean" not working Asked 7 years, 11 months ago Modified 1 year, 8 months ago Viewed 231k times Feb 8, 2016 · In Angular 7.X The CSS classes are updated as follows, depending on the type of the expression evaluation: string - the CSS classes listed in the string (space delimited) are added Array - the CSS classes declared as Array elements are added Object - keys are CSS classes that get added when the expression given in the value evaluates to a ... Feb 21, 2019 · So there is a difference when using the ? within Angular, here are the three ways you may be referring to for the usage. safe-operators When you set a value within the HTML with a question mark in it, this is a safe check, so you check the variable is defined before you access it. (trying at access values that do not exist will result in errors). The snippet below would check this.example has ...
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