/**
* jQuery Repeater
*
* Easily create a section of repeatable items.
*
* 1. Include repeater.js
* 2. Define a template to be used by the repeater.
* a. Input elements should have a class "property_{i}" (do not replace {i} with an index, the script will handle this.
* b. The template should include a container for the "row" of elements.
* c. Use the {buttons} merge tag to indicate the location of the repeater buttons.
*
* Example:
*
*
*
*
*
* {buttons}
*
*
*
*
* 3. Define a "save" callback to handle how your data is saved. It will give you an array of objects representing your data.
*
*/
jQuery.fn.repeater = function( options ) {
var self = this,
defaults = {
template: '',
limit: 5,
items: [{}],
saveEvents: 'blur change',
saveElements: 'input, select',
addButtonMarkup: '+',
removeButtonMarkup: '-',
minItemCount: 1,
callbacks: {
save: function() { },
beforeAdd: function() { },
add: function() { },
beforeAddNew: function() { },
addNew: function() { },
beforeRemove: function() { },
remove: function() { },
repeaterButtons: function() { return false; }
}
};
self.options = jQuery.extend( true, {}, defaults, options );
self.elem = jQuery( this );
self.items = self.options.items;
self.callbacks = self.options.callbacks;
self._template = self.options.template;
self._baseObj = self.items[0];
self.init = function() {
self.stashTemplate();
self.elem.addClass( 'repeater' );
self.refresh();
self.bindEvents();
return self;
}
self.bindEvents = function() {
self.options.saveEvents = self.getNamespacedEvents( self.options.saveEvents );
self.elem.off( 'click.repeater', 'a.add-item' );
self.elem.on( 'click.repeater', 'a.add-item:not(.inactive)', function() {
self.addNewItem( this );
});
self.elem.off( 'click.repeater', 'a.remove-item' );
self.elem.on( 'click.repeater', 'a.remove-item', function( event ){
self.removeItem( this );
});
self.elem.off( self.options.saveEvents, self.options.saveElements );
self.elem.on( self.options.saveEvents, self.options.saveElements, function() {
self.save();
});
}
self.stashTemplate = function() {
// if no template provided or in "storage", use current HTML
if( ! self._template )
self._template = self.elem.html();
self._template = jQuery.trim( self._template );
}
self.addItem = function( item, index ) {
var itemMarkup = self.getItemMarkup( item, index),
itemElem = jQuery( itemMarkup ).addClass( 'item-' + index );
self.callbacks.beforeAdd( self, itemElem, item, index );
self.append( itemElem );
self.populateSelects( item, index );
self.callbacks.add( self, itemElem, item, index );
}
self.getItemMarkup = function( item, index ) {
var itemMarkup = self._template;
for( var property in item ) {
if( ! item.hasOwnProperty( property ) )
continue;
itemMarkup = itemMarkup.replace( /{i}/g, index );
itemMarkup = itemMarkup.replace( '{buttons}', self.getRepeaterButtonsMarkup( index ) );
itemMarkup = itemMarkup.replace( new RegExp( '{' + property + '}', 'g' ), escapeAttr( item[property] ) );
}
return itemMarkup;
}
self.getRepeaterButtonsMarkup = function( index ) {
var buttonsMarkup = self.callbacks.repeaterButtons( self, index );
if( ! buttonsMarkup )
buttonsMarkup = self.getDefaultButtonsMarkup( index );
return buttonsMarkup;
}
self.getDefaultButtonsMarkup = function( index ) {
var cssClass = self.items.length >= self.options.limit && self.options.limit !== 0 ? 'inactive' : '',
buttons = '' + self.options.addButtonMarkup + '';
if( self.items.length > self.options.minItemCount )
buttons += '' + self.options.removeButtonMarkup + '';
return '
' + buttons + '
';
}
self.populateSelects = function( item, index ) {
// after appending the row, check each property to see if it is a select and then populate
for ( var property in item ) {
if ( ! item.hasOwnProperty( property ) ) {
continue;
}
var input = self.elem.find( '.' + property + '_' + index );
if ( ! input.is( 'select' ) ) {
continue;
}
if ( jQuery.isArray( item[ property ] ) ) {
input.val( item[ property ] );
} else {
input.find( 'option[value="' + item[ property ] + '"]' ).prop( 'selected', true );
}
}
}
self.addNewItem = function( elemOrItem, index ) {
var isElem = self.isElement( elemOrItem ),
index = parseInt( typeof index !== 'undefined' ? index : ( isElem ? parseInt( jQuery( elemOrItem ).attr( 'data-index' ), 10 ) + 1 : self.items.length ), 10 ),
item = isElem ? self.getBaseObject() : elemOrItem;
self.callbacks.beforeAddNew( self, index );
self.items.splice( index, 0, item );
self.callbacks.addNew( self, index );
self.refresh().save();
return self;
}
self.removeItem = function( elemOrIndex ) {
var index = self.isElement( elemOrIndex ) ? jQuery( elemOrIndex ).attr( 'data-index' ) : elemOrIndex;
self.callbacks.beforeRemove( self, index );
// using delete (over splice) to maintain the correct indexes for
// the items array when saving the data from the UI
delete self.items[index];
self.callbacks.remove( self, index );
self.save().refresh();
}
self.refresh = function() {
self.elem.empty();
for( var i = 0; i < self.items.length; i++ ) {
self.addItem( self.items[i], i );
}
return self;
}
self.save = function() {
var keys = self.getBaseObjectKeys(),
data = [];
for( var i = 0; i < self.items.length; i++ ) {
if( typeof self.items[i] == 'undefined' )
continue;
var item = {};
for( var j = 0; j < keys.length; j++ ) {
var key = keys[j],
id = '.' + key + '_' + i,
value = self.elem.find( id ).val();
item[key] = typeof value == 'undefined' ? false : value;
}
data.push( item );
}
// save data to items
self.items = data;
// save data externally via callback
self.callbacks.save( self, data );
return self;
}
/**
* Loops through the current items array and retrieves the object properties of the
* first valid item object. Originally this would simply pull the object keys from
* the first index of the items array; however, when the first item has been
* 'deleted' (see the save() method), it will be undefined.
*/
self.getBaseObjectKeys = function() {
var keys = [],
items = self.items.length > 0 ? self.items : [ self._baseObj ];
for( var i = 0; i < items.length; i++ ) {
if( typeof items[i] == 'undefined' )
continue;
for( var key in items[i] ) {
if( ! items[i].hasOwnProperty( key ) )
continue;
keys.push( key );
}
break;
}
return keys;
}
self.getBaseObject = function() {
var item = {},
keys = self.getBaseObjectKeys();
for( var i = 0; i < keys.length; i++ ) {
item[keys[i]] = '';
}
return item;
}
self.getNamespacedEvents = function( events ) {
var events = events.split( ' ' ),
namespacedEvents = [];
for( var i = 0; i < events.length; i++ ) {
namespacedEvents.push( events[i] + '.repeater' );
}
return namespacedEvents.join( ' ' );
}
/**
* http://stackoverflow.com/questions/384286/javascript-isdom-how-do-you-check-if-a-javascript-object-is-a-dom-object
* @param obj
* @returns {boolean}
*/
self.isElement = function( obj ) {
try {
//Using W3 DOM2 (works for FF, Opera and Chrom)
return obj instanceof HTMLElement;
}
catch(e){
//Browsers not supporting W3 DOM2 don't have HTMLElement and
//an exception is thrown and we end up here. Testing some
//properties that all elements have. (works on IE7)
return (typeof obj==="object") &&
(obj.nodeType===1) && (typeof obj.style === "object") &&
(typeof obj.ownerDocument ==="object");
}
}
return self.init();
};
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