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((global) => {
/*
* This class overrides the browser's validation error bubbles, displaying custom
* error messages for invalid fields instead. To begin validating any form, add the
* class `show-gl-field-errors` to the form element, and ensure error messages are
* declared in each inputs' title attribute.
*
* Example:
*
* <form class='show-gl-field-errors'>
* <input type='text' name='username' title='Username is required.'/>
*</form>
*
* */
const errorMessageClass = 'gl-field-error';
const inputErrorClass = 'gl-field-error-outline';
class GlFieldError {
constructor({ input, formErrors }) {
this.inputElement = $(input);
this.inputDomElement = this.inputElement.get(0);
this.form = formErrors;
this.errorMessage = this.inputElement.attr('title') || 'This field is required.';
this.fieldErrorElement = $(`<p class='${errorMessageClass} hide'>${ this.errorMessage }</p>`);
this.state = {
valid: false,
empty: true
};
this.initFieldValidation();
}
initFieldValidation() {
// hidden when injected into DOM
this.inputElement.after(this.fieldErrorElement);
this.inputElement.off('invalid').on('invalid', this.handleInvalidInput.bind(this));
}
renderValidity() {
this.setClearState();
if (this.state.valid) {
return this.setValidState();
}
if (this.state.empty) {
return this.setEmptyState();
}
if (!this.state.valid) {
return this.setInvalidState();
}
this.form.focusOnFirstInvalid.apply(this.form);
}
handleInvalidInput(event) {
event.preventDefault();
this.state.valid = false;
this.state.empty = false;
this.renderValidity();
// For UX, wait til after first invalid submission to check each keyup
this.inputElement.off('keyup.field_validator')
.on('keyup.field_validator', this.updateValidityState.bind(this));
}
getInputValidity() {
return this.inputDomElement.validity.valid;
}
updateValidityState() {
const inputVal = this.inputElement.val();
this.state.empty = !!inputVal.length;
this.state.valid = this.getInputValidity();
this.renderValidity();
}
setValidState() {
return this.setClearState();
}
setEmptyState() {
return this.setInvalidState();
}
setInvalidState() {
this.inputElement.addClass(inputErrorClass);
this.inputElement.siblings('p').hide();
return this.fieldErrorElement.show();
}
setClearState() {
const inputVal = this.inputElement.val();
if (!inputVal.split(' ').length) {
const trimmedInput = this.inputElement.val().trim();
this.inputElement.val(trimmedInput);
}
this.inputElement.removeClass(inputErrorClass);
this.inputElement.siblings('p').hide();
this.fieldErrorElement.hide();
}
checkFieldValidity(target) {
return target.validity.valid;
}
}
const customValidationFlag = 'no-gl-field-errors';
class GlFieldErrors {
constructor(form) {
this.form = $(form);
this.state = {
inputs: [],
valid: false
};
this.initValidators();
}
initValidators () {
// select all non-hidden inputs in form
this.state.inputs = this.form.find(':input:not([type=hidden])').toArray()
.filter((input) => !input.classList.contains(customValidationFlag))
.map((input) => new GlFieldError({ input, formErrors: this }));
this.form.on('submit', this.catchInvalidFormSubmit);
}
/* Neccessary to prevent intercept and override invalid form submit
* because Safari & iOS quietly allow form submission when form is invalid
* and prevents disabling of invalid submit button by application.js */
catchInvalidFormSubmit (event) {
if (!event.currentTarget.checkValidity()) {
event.preventDefault();
event.stopPropagation();
}
}
focusOnFirstInvalid () {
const firstInvalid = this.state.inputs.find((input) => !input.inputDomElement.validity.valid);
$(firstInvalid).focus();
}
}
global.GlFieldErrors = GlFieldErrors;
})(window.gl || (window.gl = {}));
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