score:0
you can add a max attribute that will specify the highest possible number that you may insert
<input type="number" max="999" />
you can also specify the min value of the range
<input type="number" min="1" max="999" />
score:0
you can make use of inputprops
to set min
and max
length. like
inputprops={{ maxlength: 99999}}
<textfield
id="samplefiled"
label="vcode"
type="number"
required
classname="text-field"
value={this.state.code}
margin="normal"
inputprops={{ maxlength: 99999}}
/>
score:5
isnan()
and number
can be combined to reject strings
that don't evaluate to numbers
.
see below for a practical example.
// field.
class field extends react.component {
// state.
state = { value: '' }
// render.
render = () => <input placeholder="numbers only" value={this.state.value} onchange={this.handlechange}/>
// handle change.
handlechange = ({target: {value}}) => this.setstate(state => value.length <= 6 && !isnan(number(value)) && {value} || state)
}
// mount.
reactdom.render(<field/>, document.queryselector('#root'))
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="root"></div>
score:12
insert the following function in input type="number"
<input type = "number" maxlength = "5" oninput={this.maxlengthcheck} />
react function
maxlengthcheck = (object) => { if (object.target.value.length > object.target.maxlength) { object.target.value = object.target.value.slice(0, object.target.maxlength) } }
Source: stackoverflow.com
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