将长度约束放在 response js 中的 TextField 中

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The material-design <TextField /> component haven't any length property.

You can create yours in the onChange() method.

updateTextField(event,value){
if(value.length <= 12){
//Update your state
}
else{
//Value length is biggest than 12
}
}


<TextField
id="SigninTextfield"
label="Aadhaar number"
id="Aadhar"
lineDirection="center"
required={true}
type="number"
onChange={(e,v) => this.updateTextField(e,v)}
style={styles.rootstyle}
erorText="Please enter only 12 digits number"
/>

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You can set the maxLength property for limiting the text in text box.

Instead of onChange method you can pass maxLength to the inputProps (lowercase i, not InputProps) props of material-ui TextField.

<TextField
required
id="required"
label="Required"
defaultValue="Hello World"
inputProps=\{\{ maxLength: 12 }}
/>

Basically we can edit all input element's native attrs via inputProps object.

Link to TextField Api

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最佳答案

I found another solution here.

<TextField
required
id="required"
label="Required"
defaultValue="Hello World"
onInput = {(e) =>{
e.target.value = Math.max(0, parseInt(e.target.value) ).toString().slice(0,12)
}}/>

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The accepted answer won't work in Firefox for large numbers (greater than 16 digits). Numbers just behaves in a weird way.

For a 22 length field we ended up using this:

<TextField
required
validateOnBlur
field="cbu"
label="22 dígitos del CBU"
validate={validate.required}
type="text"
inputProps={
{maxLength: 22}
}
onInput={(e) => { e.target.value = e.target.value.replace(/[^0-9]/g, '') }}

/>

Basically, native maxLength constraint for text fields, plus a conversion from string to numbers "on the fly".

Improvement

Also you may prefer to make this reusable and more semantic.

# constraints.js
const onlyNumbers = (e) => { e.target.value = e.target.value.replace(/[^0-9]/g, '') };


# form.js
<TextField
field="cbu"
label="22 dígitos del CBU"
inputProps={
{maxLength: 22}
}
onInput={(e) => onlyNumbers(e) }

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      <TextField
id="username"
name="username"
label={translate('username')}
onChange={handleChange}
onBlur={handleBlur}
value={values.username}
error={Boolean(errors.username) && touched.username}
helperText={(errors.username && touched.username && translate(errors.username))}
required
inputProps=\{\{maxLength :20}}


/>

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I discovered something weird on the behavior between TextField and Input from Material UI

They are very similar to each other, the problem I see is the following:

On the TextField component, if you use InputProps with capital "I", the Adorments are shown, but in the other hand if you use it as lowercase "inputProps", the maxLength Html attribute is TAKEN as valid, but not the adorments

I ended up using INPUT instead of a TextField so you can use adorments in

               <TextField
variant="outlined"
required
fullWidth
error={errors.email}
id="email"
label={t("signup-page.label-email")}
name="email"
onChange={handleChange}
inputProps=\{\{
endAdornment: (
<InputAdornment position="end">
<IconButton aria-label="toggle password visibility">
<EmailIcon />
</IconButton>
</InputAdornment>
),
maxLength: 120,
}}
/>

in the above code the adorment is ignored, but maxLength taken used as "inputProps" camel case

The below code is a working example, as you might see, I embraced it as in the old style within a Form Control, the input label and the input "outlinedInput"

        <FormControl variant="outlined" fullWidth>
<InputLabel htmlFor="firstName">Password</InputLabel>
<OutlinedInput
value={values.firstName}
autoComplete="outlined"
name="firstName"
variant="outlined"
required
fullWidth
error={errors.firstName}
id="firstName"
label={t("signup-page.label-firstname")}
onChange={handleChange}
autoFocus
inputProps=\{\{ maxLength: 32 }}
/>
</FormControl>

Solution. My final recommendation, use an OutlinedInput instead of a TextField, so you can put in a separated way Adorments and also maxLength

Below a working example with FormControl OutlinedInput, inputProps - maxLength and an end Adorment Icon

      <FormControl variant="outlined" fullWidth>
<InputLabel htmlFor="password">Password</InputLabel>
<OutlinedInput
value={values.passwordConfirm}
variant="outlined"
required
fullWidth
error={errors.passwordConfirm}
name="passwordConfirm"
label={t("signup-page.label-password-confirm")}
type={values.showPasswordConfirm ? "text" : "password"}
id="password-confirm"
onChange={handleChange}
inputProps= \{\{maxLength:32}}
endAdornment= {
<InputAdornment position="end">
<IconButton
aria-label="toggle password visibility"
onClick={handleClickShowPassword("passwordConfirm")}
onMouseDown={handleMouseDownPassword}
>
{values.showPasswordConfirm ? (
<Visibility />
) : (
<VisibilityOff />
)}
</IconButton>
</InputAdornment>
}
/>
{errors.passwordConfirm && (
<p className="error"> {errors.passwordConfirm} </p>
)}
</FormControl>

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Is it worth noting that Material-ui <TextField /> component doesn not have a maxlength property. However, the original html <input> does. So you don't really need to create any extra function to get this to work. Just use the base <input> attributes using inputProps.

The actual answer is this:

inputProps={
{maxLength: 22}
}
// Result => <input maxlength="yourvalue" />

What this does is it sets the maxlength attribute of the underlying <input> resulting in: <input maxlength="yourvalue" />. Another important thing to note here is that you use inputProps and not InputProps. The one you're targeting is the small letter inputProps.

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    <TextField
autoFocus={true}
name="name"
onChange={handleChange}
placeholder="placeholder"
id="filled-basic"
variant="filled"
size="small"
fullWidth
inputProps=\{\{
maxLength: 25,
}}
InputProps=\{\{
startAdornment: (
<InputAdornment position="start">
<SearchIcon />
</InputAdornment>
),
}}
/>

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In your change handler, just write.

if (event.target.value.length !== maxLength ) return false;

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If you're using MUI 5, version 5.0.6, due to a support for legacy, you will have to do something like this,

            <TextField
id="standard-textarea"
label="A label"
placeholder="Some text here"
multiline
variant="standard"
defaultValue={"Hello"}
inputProps=\{\{
maxLength: 255,
}}
InputProps=\{\{
disableUnderline: true,
}}
/>

The TextField supports both inputProps and InputProps, but some properties don't work vice versa.

maxLength does not work as expected in InputProps, and a property like disableUnderline for the MUI 5 does not work as expected in inputProps.

Be careful with a possible typo with the i.

See the API for more information, https://mui.com/api/text-field/.

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I had a similar issue, but with TextareaAutosize. Unfortunately,

inputProps=\{\{ maxLength: 12 }}

doesn't work with TextareaAutosize.

The below workaround works for TextareaAutosize and for both text and numbers. Inspired by the accepted answer to this question - https://stackoverflow.com/a/49130234/5236534

onInput = {(e) =>{
e.target.value = (e.target.value).toString().slice(0,10)

import * as React from 'react';
import TextareaAutosize from '@mui/material/TextareaAutosize';


export default function MinHeightTextarea() {
return (
<TextareaAutosize
aria-label="minimum height"
minRows={3}
placeholder="Minimum 3 rows"
style=\{\{ width: 200 }}
onInput = {(e) =>{
e.target.value = (e.target.value).toString().slice(0,10)
}}
        

/>
);
}

Link to demo: Limiting character length in MUI TextareaAutosize

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<TextField
id="SigninTextfield"
label="Aadhaar number"
id="Aadhar"
lineDirection="center"
required={true}
type="number"
inputProps=\{\{
maxLength: 20,
}}
style={styles.rootstyle}
erorText="Please enter only 12 digits number"
/>

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For people who still are looking for a solution for the number field, this solution worked fine for me.

onInput={(e: any) => {
e.target.value = Math.max(0, parseInt(e.target.value))
.toString()
.slice(0, 2);
}}

Make sure to use any.