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/**
 * @copyright	Copyright (C) 2005 - 2018 Open Source Matters, Inc. All rights reserved.
 * @license		GNU General Public License version 2 or later; see LICENSE.txt
 */

/**
 * Unobtrusive Form Validation and HTML5 Form polyfill library
 *
 * Inspired by: Ryan Seddon <http://thecssninja.com/javascript/H5F>
 *
 * @package		Joomla.Framework
 * @subpackage	Forms
 */

( function( $, document, undefined ) {
	"use strict";

	// Utility function
	if ( typeof Object.create !== 'function' ) {
		Object.create = function( obj ) {
			function F() {}
			F.prototype = obj;
			return new F();
		};
	}

	var features = ( function( el, item ) {
		var attributes = [ 'required', 'pattern', 'placeholder', 'autofocus', 'formnovalidate' ],
			types = [ 'email', 'url', 'number', 'range' ],
			result = {
				attributes: {},
				types: {}
			};

		while ( item = attributes.pop() ) {
			result.attributes[ item ] = !!( item in el );
		}

		while ( item = types.pop() ) {
			el.setAttribute( 'type', item );
			result.types[ item ] = ( el.type == item );
		}

		return result;
	}( document.createElement( "input" ) ) );

	var H5Form = {
		/**
		 * Init function, prepares the form for for validation
		 *
		 * @param   object   options  Some options to override the defaults.
		 * @param   Element  elem     The form or element to validate.
		 *
		 * @return  void
		 */
		init: function( options, elem ) {
			var self = this;

			self.elem = elem;
			self.$elem = $( elem );
			elem.H5Form = self;
			self.options = $.extend( {}, $.fn.h5f.options, options );

			// Check whether the element is form or not
			if ( elem.nodeName.toLowerCase() === "form" ) {
				self.bindWithForm( self.elem, self.$elem );
			}
		},

		/**
		 * Attach the validation behaviors to the form
		 *
		 * @param   Element  form   The form element
		 * @param   jQuery   $form  A jQuery object containing the form
		 *
		 * @return  void
		 */
		bindWithForm: function( form, $form ) {
			var self = this,
				novalidate = !!$form.attr( 'novalidate' ),
				f = form.elements,
				flen = f.length,
				formnovalidate;

			if ( self.options.formValidationEvent === "onSubmit" ) {
				$form.on( 'submit', function( e ) {
					formnovalidate = this.H5Form.donotValidate !== undefined ? this.H5Form.donotValidate : false;

					if ( !formnovalidate && !novalidate && !self.validateForm( self ) ) {
						// Prevent form from submit
						e.preventDefault();
						this.donotValidate = false;
					} else {
						$form.find( ':input' )
							.each( function() {
								self.placeholder( self, this, 'submit' );
							} );
					}
				});
			}

			$form.on( 'focusout focusin', function( event ) {
				self.placeholder( self, event.target, event.type );
			});

			$form.on( 'focusout change', self.validateField );

			$form.find( 'fieldset' )
				.on( 'change', function() {
					self.validateField( this );
				});

			if ( !features.attributes.formnovalidate ) {
				$form.find( ':submit[formnovalidate]' )
					.on( 'click', function() {
						self.donotValidate = true;
					});
			}

			while ( flen-- ) {
				// Assign graphical polyfills
				self.polyfill( f[ flen ] );
				self.autofocus( self, f[ flen ] );
			}
		},

		/**
		 * Apply the polyfills where applicable
		 *
		 * @param   Element  elem  The element to apply polyfills to
		 *
		 * @return  void
		 */
		polyfill: function( elem ) {
			if ( elem.nodeName.toLowerCase() === 'form' ) return true;

			var self = elem.form.H5Form;

			self.placeholder( self, elem );
			self.numberType( self, elem );
		},

		/**
		 * Validate the form
		 *
		 * @return  boolean  True if the form is valid, False if not
		 */
		validateForm: function() {
			var self = this,
				form = self.elem,
				f = form.elements,
				flen = f.length,
				isFieldValid = true,
				i, elem;

			form.isValid = true;

			for ( i = 0; i < flen; i++ ) {
				elem = f[ i ];
				elem.isRequired = !!elem.required;
				if (elem.isDisabled) {
					elem.isDisabled = !!elem.disabled;
				}

				//Do Validation
				if ( !elem.isDisabled ) {
					isFieldValid = self.validateField( elem );

					// Set focus to first invalid field
					if ( form.isValid && !isFieldValid ) {
						self.setFocusOn( elem );
					}

					form.isValid = isFieldValid && form.isValid;
				}
			}

			if ( self.options.doRenderMessage ) {
				self.renderErrorMessages( self, form );
			}

			return form.isValid;
		},

		/**
		 * Validate a field
		 *
		 * @param   mixed  e  Either an Event or Element
		 *
		 * @return  mixed  True if the field is valid, False if not, null if the field has no form.
		 */
		validateField: function( e ) {
			var elem = e.target || e,
				isMissing = false,
				isRequired = false,
				isDisabled = false,
				isPatternMismatched = false,
				self, $elem, $labelref;

			if ( elem.form === undefined ) {
				return null;
			}

			self = elem.form.H5Form;
			$elem = $( elem );
			isRequired = !!$elem.attr( "required" );
			isDisabled = !!$elem.attr( "disabled" );

			if ( !elem.isDisabled ) {
				isMissing = !features.attributes.required && isRequired && self.isValueMissing( self, elem );
				isPatternMismatched = !features.attributes.pattern && self.matchPattern( self, elem );
			}

			elem.validityState = {
				valueMissing: isMissing,
				patternMismatch: isPatternMismatched,
				valid: ( elem.isDisabled || !( isMissing || isPatternMismatched ) )
			};

			if ( !features.attributes.required ) {
				if ( elem.validityState.valueMissing ) {
					$elem.addClass( self.options.requiredClass );
				} else {
					$elem.removeClass( self.options.requiredClass );
				}
			}

			if ( !features.attributespattern ) {
				if ( elem.validityState.patternMismatch ) {
					$elem.addClass( self.options.patternClass );
				} else {
					$elem.removeClass( self.options.patternClass );
				}
			}

			if ( !elem.validityState.valid ) {
				$elem.addClass( self.options.invalidClass );
				$labelref = self.findLabel( $elem );
				$labelref.addClass( self.options.invalidClass );
				$labelref.attr( 'aria-invalid', 'true' );
			} else {
				$elem.removeClass( self.options.invalidClass );
				$labelref = self.findLabel( $elem );
				$labelref.removeClass( self.options.invalidClass );
				$labelref.attr( 'aria-invalid', 'false' );
			}

			return elem.validityState.valid;
		},

		/**
		 * Check if the field has no value
		 *
		 * @param   H5Form    self  This
		 * @param   Element   elem  A field element to check
		 *
		 * @return  Boolean
		 */
		isValueMissing: function( self, elem ) {
			var $elem = $( elem ),
				type = elem.type !== undefined ? elem.type : elem.tagName.toLowerCase(),
				isSpecialType = /^(checkbox|radio|fieldset)$/i.test( type ),
				isIgnoredType = /^submit$/i.test( type ),
				elements, i, l;

			if ( isIgnoredType ) {
				return false;
			}

			if ( !isSpecialType ) {
				if ( $elem.val() === "" || ( !features.attributes.placeholder && $elem.hasClass( self.options.placeholderClass ) ) ) {
					return true;
				}
			} else {
				if ( type === "checkbox" ) {
					return !$elem.is( ':checked' );
				} else {
					elements = ( type === "fieldset" ) ? $elem.find( 'input' ) : document.getElementsByName( elem.name );

					for ( i = 0, l = elements.length; i < l; i++ ) {
						if ( $( elements[ i ] ).is( ':checked' ) ) {
							return false;
						}
					}

					// Since no checkbox or radio box is checked value is missing.
					return true;
				}
			}

			return false;
		},

		/**
		 * Check if a pattern is not matched
		 *
		 * @param   H5Form    self  This
		 * @param   Element   elem  A field element to check
		 *
		 * @return  boolean   True if the pattern does not match.
		 */
		matchPattern: function( self, elem ) {
			var $elem = $( elem ),
				val = $elem.attr( 'value' ),
				pattern = $elem.attr( 'pattern' ),
				type = $elem.attr( 'type' ),
				i, l;

			if ( features.attributes.placeholder || !$elem.attr( 'placeholder' ) || !$elem.hasClass( self.options.placeholderClass ) ) {
				val = $elem.attr( 'value' );
			}

			if ( val === "" ) {
				return false;
			}

			if ( type === "email" ) {
				if ( $elem.attr( 'multiple' ) !== undefined ) {
					val = val.split( self.options.mutipleDelimiter );

					for ( i = 0, l = val.length; i < l; i++ ) {
						if ( !self.options.emailPatt.test( val[ i ].replace( /[ ]*/g, '' ) ) ) return true;
					}
				} else {
					return !self.options.emailPatt.test( val );
				}
			} else if ( type === "url" ) {
				return !self.options.urlPatt.test( val );
			} else if ( type === 'text' ) {
				if ( pattern !== undefined ) {
					usrPatt = new RegExp( '^(?:' + pattern + ')$' );

					return !usrPatt.test( val );
				}
			}

			return false;
		},

		/**
		 * Placeholder polyfill
		 *
		 * @param   H5Form    self   This
		 * @param   Element   elem   A field element to fill
		 * @param   Event     event  Event object
		 *
		 * @return  void
		 */
		placeholder: function( self, elem, event ) {
			var $elem = $( elem ),
				placeholder = $elem.attr( "placeholder" ),
				expectEmpty = /^(focusin|submit)$/i.test( event ),
				isInput = /^(input|textarea)$/i.test( elem.nodeName ),
				isIgnored = /^password$/i.test( elem.type ),
				isNative = features.attributes.placeholder;

			if ( isNative || !isInput || isIgnored || placeholder === undefined ) {
				return;
			}

			if ( elem.value === "" && !expectEmpty ) {
				elem.value = placeholder;
				$elem.addClass( self.options.placeholderClass );
			} else if ( elem.value === placeholder && expectEmpty ) {
				elem.value = "";
				$elem.removeClass( self.options.placeholderClass );
			}
		},

		/**
		 * Polyfill for number type fields
		 *
		 * @param   H5Form    self   This
		 * @param   Element   elem   A field element to replace
		 *
		 * @return  void
		 */
		numberType: function( self, elem ) {
			var $elem = $( elem ),
				type = $elem.attr( 'type' ),
				isInput = /^input$/i.test( elem.nodeName ),
				isType = /^(number|range)$/i.test( type ),
				min, max, step, value, attributes, $select, $option, i;

			if ( !isInput || !isType || ( type == "number" && features.types.number ) || ( type == "range" && features.types.range ) ) {
				return;
			}

			min = parseInt( $elem.attr( 'min' ) );
			max = parseInt( $elem.attr( 'max' ) );
			step = parseInt( $elem.attr( 'step' ) );
			value = parseInt( $elem.attr( 'value' ) );
			attributes = $elem.prop( "attributes" );
			$select = $( '<select>' );

			min = isNaN( min ) ? -100 : min;

			for ( i = min; i <= max; i += step ) {
				$option = $( '<option value="' + i + '">' + i + '</option>' );

				if ( value == i || ( value > i && value < i + step ) ) {
					$option.attr( 'selected', '' );
				}

				$select.append( $option );
			}

			$.each( attributes, function() {
				$select.attr( this.name, this.value );
			});

			$elem.replaceWith( $select );
		},

		/**
		 * Autofocus polyfill
		 *
		 * @param   H5Form    self   This
		 * @param   Element   elem   A field element to autofocus
		 *
		 * @return  void
		 */
		autofocus: function( self, elem ) {
			var $elem = $( elem ),
				doAutofocus = !!$elem.attr( "autofocus" ),
				canFocus = /^(input|textarea|select|fieldset)$/i.test( elem.nodeName ),
				isIgnored = /^submit$/i.test( elem.type ),
				isNative = features.attributes.autofocus;

			if ( !isNative && canFocus && !isIgnored && doAutofocus ) {
				$(function() {
					self.setFocusOn( elem );
				});
			}
		},

		/**
		 * Find an element's label.
		 *
		 * @param   Element  $elem  Some kind of input element
		 *
		 * @return  Element  A label element
		 */
		findLabel: function( $elem ) {
			var $label = $( 'label[for="' + $elem.attr( 'id' ) + '"]' ),
				$parentElem;

			if ( $label.length <= 0 ) {
				$parentElem = $elem.parent();

				if ( $parentElem.get( 0 )
					.tagName.toLowerCase() == "label" ) {
					$label = $parentElem;
				}
			}

			return $label;
		},

		/**
		 * Set focus on an element.
		 *
		 * @param  Element  elem  The element to focus on.
		 */
		setFocusOn: function( elem ) {
			if ( elem.tagName.toLowerCase() === "fieldset" ) {
				$( elem )
					.find( ":first" )
					.focus();
			} else {
				$( elem )
					.focus();
			}
		},

		/**
		 * Renders any error messages
		 *
		 * @param   H5Form    self   This
		 * @param   Element   form   A form element
		 *
		 * @return  void
		 */
		renderErrorMessages: function( self, form ) {
			var f = form.elements,
				flen = f.length,
				error = {
					errors: []
				},
				$elem, $label;

			while ( flen-- ) {
				$elem = $( f[ flen ] );
				$label = self.findLabel( $elem );

				if ( $elem.hasClass( self.options.requiredClass ) ) {
					error.errors[ flen ] = $label.text()
						.replace( "*", "" ) + self.options.requiredMessage;
				}

				if ( $elem.hasClass( self.options.patternClass ) ) {
					error.errors[ flen ] = $label.text()
						.replace( "*", "" ) + self.options.patternMessage;
				}
			}

			if ( error.errors.length > 0 ) {
				Joomla.renderMessages( error );
			}
		}
	};

	$.fn.h5f = function( options ) {
		return this.each(function() {
			Object.create( H5Form )
				.init( options, this );
		});
	};

	$.fn.h5f.options = {
		invalidClass: "invalid",
		requiredClass: "required",
		requiredMessage: " is required.",
		placeholderClass: "placeholder",
		patternClass: "pattern",
		patternMessage: " doesn't match pattern.",
		doRenderMessage: false,
		formValidationEvent: 'onSubmit',
		emailPatt: /^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/,
		urlPatt: /[a-z][\-\.+a-z]*:\/\//i
	};

	$( function() {
		$( 'form' )
			.h5f({
				doRenderMessage: true,
				requiredClass: "musthavevalue"
			});
	});

})( jQuery, document );