django-select2/django_select2/static/js/heavy_data.js

var django_select2 = {
	MULTISEPARATOR: String.fromCharCode(0),
	get_url_params: function (term, page, context) {
		var field_id = $(this).data('field_id'),
			res = {
				'term': term,
				'page': page,
				'context': context
			};
		if (field_id) {
			res['field_id'] = field_id;
		}
		return res;
	},
	process_results: function (data, page, context) {
		var results;
		if (data.err && data.err.toLowerCase() === 'nil') {
			results = {
				'results': data.results
			};
			if (context) {
				results['context'] = context;
			}
			if (data.more === true || data.more === false) {
				results['more'] = data.more;
			}
		} else {
			results = {'results':[]};
		}
		if (results.results) {
			$(this).data('results', results.results);
		} else {
			$(this).removeData('results');
		}
		return results;
	},
	setCookie: function (c_name, value) {
		document.cookie = c_name + "=" + escape(value);
	},
	getCookie: function (c_name) {
		var i, x, y, ARRcookies = document.cookie.split(";");

		for (i = 0; i < ARRcookies.length; i++) {
			x = ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
			y = ARRcookies[i].substr(ARRcookies[i].indexOf("=") + 1);
			x = x.replace(/^\s+|\s+$/g,"");
			if (x == c_name) {
				return unescape(y);
			}
		}
	},
	delCookie: function (c_name, isStartsWithPattern) {
		var i, x, ARRcookies;

		if (!isStartsWithPattern) {
			document.cookie = c_name + '=; expires=Thu, 01 Jan 1970 00:00:01 GMT;';
		} else {
			ARRcookies = document.cookie.split(";");

			for (i = 0; i < ARRcookies.length; i++) {
				x = ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
				x = x.replace(/^\s+|\s+$/g,"");
				if (x.indexOf(c_name) == 0) {
					document.cookie = c_name + '=; expires=Thu, 01 Jan 1970 00:00:01 GMT;';
				}
			}
		}
	},
	onValChange: function () {
		var e = $(this), res, id = e.attr('id');

		res = django_select2.getValText(e, false);
		
		if (res && res[1]) {
			// Cookies are used to persist selection's text. This is needed
			// when the form springs back if there is any validation failure.
			$(res[0]).each(function (idx) {
				django_select2.setCookie(id + '_heavy_val:' + idx, this);
				django_select2.setCookie(id + '_heavy_txt:' + idx, res[1][idx]);
			});
		} else {
			django_select2.delCookie(id + '_heavy_val:', true);
			django_select2.delCookie(id + '_heavy_txt:', true);
		}
	},
	prepareValText: function (vals, txts, isMultiple) {
		var data = []
		$(vals).each(function (index) {
			data.push({id: this, text: txts[index]});
		});
		if (isMultiple) {
			return data;
		} else {
			if (data.length > 0) {
				return data[0];
			} else {
				return null;
			}
		}
	},
	getValText: function ($e, isGetFromCookieAllowed) {
		var val = $e.select2('val'), res = $e.data('results'), txt = $e.txt(), isMultiple = !!$e.attr('multiple'),
			f, id = $e.attr('id');
		if (val || val === 0) { // Means value is set. A numerical 0 is also a valid value.

			if (!isMultiple) {
				val = [val];
				if (txt || txt === 0) {
					txt = [txt];
				}
			}

			if (txt || txt === 0) {
				return [val, txt];
			}

			f = $e.data('userGetValText');
			if (f) {
				txt = f($e, val, isMultiple);
				if (txt || txt === 0) {
					return [val, txt];
				}
			}
			
			if (res) {
				txt = [];
				$(val).each(function (idx) {
					var i, value = this;
					
					for (i in res) {
						if (res[i].id == value) {
							val[idx] = res[i].id; // To set it to correct data type.
							txt.push(res[i].text);
						}
					}
				});
				if (txt || txt === 0) {
					return [val, txt];
				}
			}

			if (isGetFromCookieAllowed) {
				txt = [];
				$(val).each(function (idx) {
					var value = this, cookieVal;

					cookieVal = django_select2.getCookie(id + '_heavy_val:' + idx);
					
					if (cookieVal == value) {
						txt.push(django_select2.getCookie(id + '_heavy_txt:' + idx));
					}
				});
				if (txt || txt === 0) {
					return [val, txt];
				}
			}

		}
		return null;
	},
	onInit: function (e, callback) {
		e = $(e);
		var id = e.attr('id'), data = null, val = e.select2('val');

		if (val || val === 0) {
			// Value is set so need to get the text.
			data = django_select2.getValText(e);
			if (data && data[0]) {
				data = django_select2.prepareValText(data[0], data[1], !!e.attr('multiple'));
			}
		}
		if (!data) {
			e.val(null); // Nulling out set value so as not to confuse users.
		}
		callback(data); // Change for 2.3.x
	},
	onMultipleHiddenChange: function () {
		var $e = $(this), valContainer = $e.data('valContainer'), name = $e.data('name');
		valContainer.empty();
		$($e.val()).each(function () {
			var inp = $('<input>').appendTo(valContainer);
			inp.attr('type', 'hidden');
			inp.attr('name', name);
			inp.val(this);
		});
	},
	initMultipleHidden: function ($e) {
		var valContainer;

		$e.data('name', $e.attr('name'));
		$e.attr('name', '');

		valContainer = $e.after('<div>').css({'display': 'none'});
		$e.data('valContainer', valContainer);

		$e.change(django_select2.onMultipleHiddenChange);
	},
	convertArrToStr: function (arr) {
		return arr.join(django_select2.MULTISEPARATOR);
	}
};

(function( $ ){
	$.fn.txt = function() {
		return this.attr('txt');
	};
})( jQuery );