Validate input for FieldtypeOptions

[chrizz]

I was wondering if there's an easy way to validate if a title is a valid value for a FieldtypeOptions field. 

I have created a field with different status values where only a single value can be selected:
 

1=done
2=planned
3=error

Now I am going to update the page which includes this field which works fine so far - but: I I am using any other string than the defined options it stores a blank value. To avoid this I am trying to validate the input before. Something like getAllOptionsForField > in_array() etc would work but maybe there's a build-in method I am currently missing? 

Long story short: how would you validate if the given string is a valid option for a field?

as usual: Thanks

 

 

[LostKobrakai]

// $f is the Field object of your options field
$f->type->manager->getOptions($f);

 

[chrizz]

to finalize this approach

if($f->type->manager->getOptions($f)->has("title=".$this->input->whitelist("userInput"))) {
	// user selection is valid
}