How to make autocomplete field of material UI required? - reactjs

Question

I have tried a couple of ways in order to make the material UI's autocomplete field of type required but I am not getting the behavior that I wanted. I had encapsulated my field inside react hook form <Controller/> yet no luck. I want to trigger message 'Field is mandatory' on submit when nothing is added to the field.
Below is the code snippet, I have not removed comments so that it becomes a bit easier for others to understand the approach that I had followed earlier -
<Controller
name="displayName"
as={
<Autocomplete
value={lists}
multiple
fullWidth
size="small"
limitTags={1}
id="multiple-limit-lists"
options={moduleList}
getOptionLabel={(option) => option.displayName}
renderInput={(params,props) => {
return (
<div>
<div className="container">
<TextValidator {...params} variant="outlined" label="Display Name*" className="Display Text"
name="displayName" id="outlined-multiline-static"
placeholder="Enter Display-Name" size="small"
onChange={handleDisplay}
// validators={['required']} this and below line does throw a validation but the problem is this validation stays on the screen when user selects something in the autocomplete field which is wrong.
// errorMessages={['This field is required']}
// withRequiredValidator
/>
</div>
</div>
)
}}
/>
}
// onChange={handleDisplay}
control={control}
rules={{ required: true }}
// required
// defaultValue={options[0]}
/>
<ErrorMessage errors={errors} name="displayName" message="This is required" />

Answer 1

You can use the following logic to get it worked. Though this might not be the best solution but works.
<Autocomplete
renderInput={(params) => (
<TextField
{...params}
label={value.length === 0 ? title : title + " *"} //handle required mark(*) on label
required={value.length === 0}
/>
)}
/>

Answer 2

I tried using the built in required in textfield for autocomplete, and it works like a charm. Maybe you can use this as a reference.
<Autocomplete
renderInput={(params) => {
<TextField {...params} required />
}
// Other codes
/>

Answer 3

Since you are rendering <TextValidator>, you should apply mandatory(required) attribute to that component not on <AutomComplete>.

Answer 4

Try this if your Material UI version is v5
<TextField
{...params}
required
label="Tags"
value={value}
InputProps={{
...params.InputProps,
required: value.length === 0,
}}
/>