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class OtpForm extends HTMLElement {
observer?: MutationObserver;
constructor() {
super();
}
connectedCallback() {
this.observer = new MutationObserver(() => {
this.clearInputs();
this.configureInputs();
});
this.observer.observe(this, { childList: true, subtree: true });
}
disconnectedCallback() {
this.observer?.disconnect();
}
clearInputs() {
console.log("clearing all inputs");
const inputs = this.querySelectorAll(
'input:not([type="submit"])',
) as NodeListOf<HTMLInputElement>;
for (const input of inputs) {
input.value = "";
}
}
configureInputs() {
this.observer?.disconnect();
const inputs = this.querySelectorAll(
'input:not([type="submit"])',
) as NodeListOf<HTMLInputElement>;
const form = this.querySelector("form") as HTMLFormElement;
for (const input of inputs) {
input.addEventListener("focus", () => {
input.select();
});
input.addEventListener("input", () => {
if (input.value.length > 0) {
input.value = input.value.slice(0, 1).toLocaleUpperCase();
const nextInput = input.nextElementSibling as HTMLInputElement;
if (nextInput) {
nextInput.focus();
return;
}
const submitButton = form.querySelector(
'input[type="submit"]',
) as HTMLInputElement;
submitButton.focus();
let areAllInputsEntered = true;
inputs.forEach((input) => {
areAllInputsEntered = areAllInputsEntered && input.value.length > 0;
});
if (areAllInputsEntered) {
form.requestSubmit(submitButton);
}
}
});
}
}
}
customElements.define("otp-form", OtpForm);
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