When working with TypeScript, I am attempting to validate an input field to only accept binary numbers (0 and 1).
Here is my HTML:
<div>
<input type="text" (keypress) = "binaryValidate($event)">
</div>
And here is my TypeScript code:
binaryValidate(evt: number) {
if (evt === 1 ) {
return true;
} else if (evt === 0) {
return true;
} else {
return false;
}
}
However, for some reason, it always returns false.
The type of event is not a number, it is actually a KeyboardEvent. To properly check for the desired condition, you need to test its key property:
binaryValidate(evt: KeyboardEvent) {
const value = evt.key;
return value === "1" || value === "0";
}
Give it a try on codesandbox
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