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/**
* 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 `gl-show-field-errors` to the form element, and ensure error messages are
* declared in each inputs' `title` attribute. If no title is declared for an invalid
* field the user attempts to submit, "This field is required." will be shown by default.
*
* Opt not to validate certain fields by adding the class `gl-field-error-ignore` to the input.
*
* Set a custom error anchor for error message to be injected after with the
* class `gl-field-error-anchor`
*
* Examples:
*
* Basic:
*
* <form class='gl-show-field-errors'>
* <input type='text' name='username' title='Username is required.'/>
* </form>
*
* Ignore specific inputs (e.g. UsernameValidator):
*
* <form class='gl-show-field-errors'>
* <div class="form-group>
* <input type='text' class='gl-field-errors-ignore' pattern='[a-zA-Z0-9-_]+'/>
* </div>
* <div class="form-group">
* <input type='text' name='username' title='Username is required.'/>
* </div>
* </form>
*
* Custom Error Anchor (allows error message to be injected after specified element):
*
* <form class='gl-show-field-errors'>
* <div class="form-group gl-field-error-anchor">
* <input type='text' name='username' title='Username is required.'/>
* // Error message typically injected here
* </div>
* // Error message now injected here
* </form>
*
*/
/**
* Regex Patterns in use:
*
* Only alphanumeric: : "[a-zA-Z0-9]+"
* No special characters : "[a-zA-Z0-9-_]+",
*
*/
const errorMessageClass = 'gl-field-error';
const inputErrorClass = 'gl-field-error-outline';
const errorAnchorSelector = '.gl-field-error-anchor';
const ignoreInputSelector = '.gl-field-error-ignore';
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'>${this.errorMessage}</p>`);
this.state = {
valid: false,
empty: true,
};
this.initFieldValidation();
}
initFieldValidation() {
const customErrorAnchor = this.inputElement.parents(errorAnchorSelector);
const errorAnchor = customErrorAnchor.length ? customErrorAnchor : this.inputElement;
// hidden when injected into DOM
errorAnchor.after(this.fieldErrorElement);
this.inputElement.off('invalid').on('invalid', this.handleInvalidSubmit.bind(this));
this.scopedSiblings = this.safelySelectSiblings();
}
safelySelectSiblings() {
// Apply `ignoreSelector` in markup to siblings whose visibility should not be toggled
const unignoredSiblings = this.inputElement.siblings(`p:not(${ignoreInputSelector})`);
const parentContainer = this.inputElement.parent('.form-group');
// Only select siblings when they're scoped within a form-group with one input
const safelyScoped = parentContainer.length && parentContainer.find('input').length === 1;
return safelyScoped ? unignoredSiblings : this.fieldErrorElement;
}
renderValidity() {
this.renderClear();
if (this.state.valid) {
this.renderValid();
} else if (this.state.empty) {
this.renderEmpty();
} else if (!this.state.valid) {
this.renderInvalid();
}
}
handleInvalidSubmit(event) {
event.preventDefault();
const currentValue = this.accessCurrentValue();
this.state.valid = false;
this.state.empty = currentValue === '';
this.renderValidity();
this.form.focusOnFirstInvalid.apply(this.form);
// For UX, wait til after first invalid submission to check each keyup
this.inputElement.off('keyup.fieldValidator')
.on('keyup.fieldValidator', this.updateValidity.bind(this));
}
/* Get or set current input value */
accessCurrentValue(newVal) {
return newVal ? this.inputElement.val(newVal) : this.inputElement.val();
}
getInputValidity() {
return this.inputDomElement.validity.valid;
}
updateValidity() {
const inputVal = this.accessCurrentValue();
this.state.empty = !inputVal.length;
this.state.valid = this.getInputValidity();
this.renderValidity();
}
renderValid() {
return this.renderClear();
}
renderEmpty() {
return this.renderInvalid();
}
renderInvalid() {
this.inputElement.addClass(inputErrorClass);
this.scopedSiblings.hide();
return this.fieldErrorElement.show();
}
renderClear() {
const inputVal = this.accessCurrentValue();
if (!inputVal.split(' ').length) {
const trimmedInput = inputVal.trim();
this.accessCurrentValue(trimmedInput);
}
this.inputElement.removeClass(inputErrorClass);
this.scopedSiblings.hide();
this.fieldErrorElement.hide();
}
}
window.gl = window.gl || {};
window.gl.GlFieldError = GlFieldError;
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