datahub/src/view.js
Rufus Pollock 0ead86d6d7 [#88,view,state][s]: support for setting and getting currentView.
* Also refactor so that dataset view switcher in DataExplorer runs via direct JS rather than routing (as have meant to do for a while). this is important because a) routing stuff is partly going away b) it's cleaner this way.
2012-04-16 00:13:14 +01:00

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/*jshint multistr:true */
// # Recline Views
//
// Recline Views are Backbone Views and in keeping with normal Backbone views
// are Widgets / Components displaying something in the DOM. Like all Backbone
// views they have a pointer to a model or a collection and is bound to an
// element.
//
// Views provided by core Recline are crudely divided into two types:
//
// * Dataset Views: a View intended for displaying a recline.Model.Dataset
// in some fashion. Examples are the Grid, Graph and Map views.
// * Widget Views: a widget used for displaying some specific (and
// smaller) aspect of a dataset or the application. Examples are
// QueryEditor and FilterEditor which both provide a way for editing (a
// part of) a `recline.Model.Query` associated to a Dataset.
//
// ## Dataset View
//
// These views are just Backbone views with a few additional conventions:
//
// 1. The model passed to the View should always be a recline.Model.Dataset instance
// 2. Views should generate their own root element rather than having it passed
// in.
// 3. Views should apply a css class named 'recline-{view-name-lower-cased} to
// the root element (and for all CSS for this view to be qualified using this
// CSS class)
// 4. Read-only mode: CSS for this view should respect/utilize
// recline-read-only class to trigger read-only behaviour (this class will
// usually be set on some parent element of the view's root element.
// 5. State: state (configuration) information for the view should be stored on
// an attribute named state that is an instance of a Backbone Model (or, more
// speficially, be an instance of `recline.Model.ObjectState`). In addition,
// a state attribute may be specified in the Hash passed to a View on
// iniitialization and this information should be used to set the initial
// state of the view.
//
// Example of state would be the set of fields being plotted in a graph
// view.
//
// More information about State can be found below.
//
// To summarize some of this, the initialize function for a Dataset View should
// look like:
//
// <pre>
// initialize: {
// model: {a recline.Model.Dataset instance}
// // el: {do not specify - instead view should create}
// state: {(optional) Object / Hash specifying initial state}
// ...
// }
// </pre>
//
// Note: Dataset Views in core Recline have a common layout on disk as
// follows, where ViewName is the named of View class:
//
// <pre>
// src/view-{lower-case-ViewName}.js
// css/{lower-case-ViewName}.css
// test/view-{lower-case-ViewName}.js
// </pre>
//
// ### State
//
// State information exists in order to support state serialization into the
// url or elsewhere and reloading of application from a stored state.
//
// State is available not only for individual views (as described above) but
// for the dataset (e.g. the current query). For an example of pulling together
// state from across multiple components see `recline.View.DataExplorer`.
//
// ### Writing your own Views
//
// See the existing Views.
//
// ----
// Standard JS module setup
this.recline = this.recline || {};
this.recline.View = this.recline.View || {};
(function($, my) {
// ## DataExplorer
//
// The primary view for the entire application. Usage:
//
// <pre>
// var myExplorer = new model.recline.DataExplorer({
// model: {{recline.Model.Dataset instance}}
// el: {{an existing dom element}}
// views: {{dataset views}}
// state: {{state configuration -- see below}}
// });
// </pre>
//
// ### Parameters
//
// **model**: (required) recline.model.Dataset instance.
//
// **el**: (required) DOM element to bind to. NB: the element already
// being in the DOM is important for rendering of some subviews (e.g.
// Graph).
//
// **views**: (optional) the dataset views (Grid, Graph etc) for
// DataExplorer to show. This is an array of view hashes. If not provided
// initialize with (recline.View.)Grid, Graph, and Map views (with obvious id
// and labels!).
//
// <pre>
// var views = [
// {
// id: 'grid', // used for routing
// label: 'Grid', // used for view switcher
// view: new recline.View.Grid({
// model: dataset
// })
// },
// {
// id: 'graph',
// label: 'Graph',
// view: new recline.View.Graph({
// model: dataset
// })
// }
// ];
// </pre>
//
// **state**: standard state config for this view. This state is slightly
// special as it includes config of many of the subviews.
//
// <pre>
// state = {
// query: {dataset query state - see dataset.queryState object}
// view-{id1}: {view-state for this view}
// view-{id2}: {view-state for }
// ...
// // Explorer
// currentView: id of current view (defaults to first view if not specified)
// readOnly: (default: false) run in read-only mode
// }
// </pre>
//
// Note that at present we do *not* serialize information about the actual set
// of views in use -- e.g. those specified by the views argument -- but instead
// expect either that the default views are fine or that the client to have
// initialized the DataExplorer with the relevant views themselves.
my.DataExplorer = Backbone.View.extend({
template: ' \
<div class="recline-data-explorer"> \
<div class="alert-messages"></div> \
\
<div class="header"> \
<ul class="navigation"> \
{{#views}} \
<li><a href="#{{id}}" data-view="{{id}}" class="btn">{{label}}</a> \
{{/views}} \
</ul> \
<div class="recline-results-info"> \
Results found <span class="doc-count">{{docCount}}</span> \
</div> \
<div class="menu-right"> \
<a href="#" class="btn" data-action="filters">Filters</a> \
<a href="#" class="btn" data-action="facets">Facets</a> \
</div> \
<div class="query-editor-here" style="display:inline;"></div> \
<div class="clearfix"></div> \
</div> \
<div class="data-view-container"></div> \
<div class="dialog-overlay" style="display: none; z-index: 101; ">&nbsp;</div> \
<div class="dialog ui-draggable" style="display: none; z-index: 102; top: 101px; "> \
<div class="dialog-frame" style="width: 700px; visibility: visible; "> \
<div class="dialog-content dialog-border"></div> \
</div> \
</div> \
</div> \
',
events: {
'click .menu-right a': '_onMenuClick',
'click .navigation a': '_onSwitchView'
},
initialize: function(options) {
var self = this;
this.el = $(this.el);
// Hash of 'page' views (i.e. those for whole page) keyed by page name
if (options.views) {
this.pageViews = options.views;
} else {
this.pageViews = [{
id: 'grid',
label: 'Grid',
view: new my.Grid({
model: this.model
})
}, {
id: 'graph',
label: 'Graph',
view: new my.Graph({
model: this.model
})
}, {
id: 'map',
label: 'Map',
view: new my.Map({
model: this.model
})
}];
}
// these must be called after pageViews are created
this.render();
// should come after render as may need to interact with elements in the view
this._setupState(options.state);
this.router = new Backbone.Router();
this.setupRouting();
this.model.bind('query:start', function() {
my.notify('Loading data', {loader: true});
});
this.model.bind('query:done', function() {
my.clearNotifications();
self.el.find('.doc-count').text(self.model.docCount || 'Unknown');
my.notify('Data loaded', {category: 'success'});
// update navigation
var qs = my.parseHashQueryString();
qs.reclineQuery = JSON.stringify(self.model.queryState.toJSON());
var out = my.getNewHashForQueryString(qs);
self.router.navigate(out);
});
this.model.bind('query:fail', function(error) {
my.clearNotifications();
var msg = '';
if (typeof(error) == 'string') {
msg = error;
} else if (typeof(error) == 'object') {
if (error.title) {
msg = error.title + ': ';
}
if (error.message) {
msg += error.message;
}
} else {
msg = 'There was an error querying the backend';
}
my.notify(msg, {category: 'error', persist: true});
});
// retrieve basic data like fields etc
// note this.model and dataset returned are the same
this.model.fetch()
.done(function(dataset) {
self.model.query(self.state.get('query'));
})
.fail(function(error) {
my.notify(error.message, {category: 'error', persist: true});
});
},
setReadOnly: function() {
this.el.addClass('recline-read-only');
},
render: function() {
var tmplData = this.model.toTemplateJSON();
tmplData.views = this.pageViews;
var template = $.mustache(this.template, tmplData);
$(this.el).html(template);
var $dataViewContainer = this.el.find('.data-view-container');
_.each(this.pageViews, function(view, pageName) {
$dataViewContainer.append(view.view.el);
});
var queryEditor = new my.QueryEditor({
model: this.model.queryState
});
this.el.find('.query-editor-here').append(queryEditor.el);
var filterEditor = new my.FilterEditor({
model: this.model.queryState
});
this.$filterEditor = filterEditor.el;
this.el.find('.header').append(filterEditor.el);
var facetViewer = new my.FacetViewer({
model: this.model
});
this.$facetViewer = facetViewer.el;
this.el.find('.header').append(facetViewer.el);
},
setupRouting: function() {
var self = this;
// Default route
this.router.route(/^(\?.*)?$/, this.pageViews[0].id, function(queryString) {
self.updateNav(self.pageViews[0].id, queryString);
});
$.each(this.pageViews, function(idx, view) {
self.router.route(/^([^?]+)(\?.*)?/, 'view', function(viewId, queryString) {
self.updateNav(viewId, queryString);
});
});
},
updateNav: function(pageName) {
this.el.find('.navigation li').removeClass('active');
this.el.find('.navigation li a').removeClass('disabled');
var $el = this.el.find('.navigation li a[data-view="' + pageName + '"]');
$el.parent().addClass('active');
$el.addClass('disabled');
// show the specific page
_.each(this.pageViews, function(view, idx) {
if (view.id === pageName) {
view.view.el.show();
view.view.trigger('view:show');
} else {
view.view.el.hide();
view.view.trigger('view:hide');
}
});
},
_onMenuClick: function(e) {
e.preventDefault();
var action = $(e.target).attr('data-action');
if (action === 'filters') {
this.$filterEditor.show();
} else if (action === 'facets') {
this.$facetViewer.show();
}
},
_onSwitchView: function(e) {
e.preventDefault();
var viewName = $(e.target).attr('data-view');
this.updateNav(viewName);
this.state.set({currentView: viewName});
},
// create a state object for this view and do the job of
//
// a) initializing it from both data passed in and other sources (e.g. hash url)
//
// b) ensure the state object is updated in responese to changes in subviews, query etc.
_setupState: function(initialState) {
var self = this;
// get data from the query string / hash url plus some defaults
var qs = my.parseHashQueryString();
var query = qs.reclineQuery;
query = query ? JSON.parse(query) : self.model.queryState.toJSON();
// backwards compatability (now named view-graph but was named graph)
var graphState = qs['view-graph'] || qs.graph;
graphState = graphState ? JSON.parse(graphState) : {};
// now get default data + hash url plus initial state and initial our state object with it
var stateData = _.extend({
query: query,
'view-graph': graphState,
backend: this.model.backend.__type__,
dataset: this.model.toJSON(),
currentView: this.pageViews[0].id,
readOnly: false
},
initialState);
this.state = new recline.Model.ObjectState(stateData);
// now do updates based on state
if (this.state.get('readOnly')) {
this.setReadOnly();
}
if (this.state.get('currentView')) {
this.updateNav(this.state.get('currentView'));
}
_.each(this.pageViews, function(pageView) {
var viewId = 'view-' + pageView.id;
if (viewId in self.state.attributes) {
pageView.view.state.set(self.state.get(viewId));
}
});
// finally ensure we update our state object when state of sub-object changes so that state is always up to date
this.model.queryState.bind('change', function() {
self.state.set({queryState: self.model.queryState.toJSON()});
});
_.each(this.pageViews, function(pageView) {
if (pageView.view.state && pageView.view.state.bind) {
var update = {};
update['view-' + pageView.id] = pageView.view.state.toJSON();
self.state.set(update);
pageView.view.state.bind('change', function() {
var update = {};
update['view-' + pageView.id] = pageView.view.state.toJSON();
self.state.set(update);
});
}
});
}
});
// ### DataExplorer.restore
//
// Restore a DataExplorer instance from a serialized state including the associated dataset
my.DataExplorer.restore = function(state) {
var dataset = recline.Model.Dataset.restore(state);
var explorer = new my.DataExplorer({
model: dataset,
state: state
});
return explorer;
}
my.QueryEditor = Backbone.View.extend({
className: 'recline-query-editor',
template: ' \
<form action="" method="GET" class="form-inline"> \
<div class="input-prepend text-query"> \
<span class="add-on"><i class="icon-search"></i></span> \
<input type="text" name="q" value="{{q}}" class="span2" placeholder="Search data ..." class="search-query" /> \
</div> \
<div class="pagination"> \
<ul> \
<li class="prev action-pagination-update"><a href="">&laquo;</a></li> \
<li class="active"><a><input name="from" type="text" value="{{from}}" /> &ndash; <input name="to" type="text" value="{{to}}" /> </a></li> \
<li class="next action-pagination-update"><a href="">&raquo;</a></li> \
</ul> \
</div> \
<button type="submit" class="btn">Go &raquo;</button> \
</form> \
',
events: {
'submit form': 'onFormSubmit',
'click .action-pagination-update': 'onPaginationUpdate'
},
initialize: function() {
_.bindAll(this, 'render');
this.el = $(this.el);
this.model.bind('change', this.render);
this.render();
},
onFormSubmit: function(e) {
e.preventDefault();
var query = this.el.find('.text-query input').val();
var newFrom = parseInt(this.el.find('input[name="from"]').val());
var newSize = parseInt(this.el.find('input[name="to"]').val()) - newFrom;
this.model.set({size: newSize, from: newFrom, q: query});
},
onPaginationUpdate: function(e) {
e.preventDefault();
var $el = $(e.target);
var newFrom = 0;
if ($el.parent().hasClass('prev')) {
newFrom = this.model.get('from') - Math.max(0, this.model.get('size'));
} else {
newFrom = this.model.get('from') + this.model.get('size');
}
this.model.set({from: newFrom});
},
render: function() {
var tmplData = this.model.toJSON();
tmplData.to = this.model.get('from') + this.model.get('size');
var templated = $.mustache(this.template, tmplData);
this.el.html(templated);
}
});
my.FilterEditor = Backbone.View.extend({
className: 'recline-filter-editor well',
template: ' \
<a class="close js-hide" href="#">&times;</a> \
<div class="row filters"> \
<div class="span1"> \
<h3>Filters</h3> \
</div> \
<div class="span11"> \
<form class="form-horizontal"> \
<div class="row"> \
<div class="span6"> \
{{#termFilters}} \
<div class="control-group filter-term filter" data-filter-id={{id}}> \
<label class="control-label" for="">{{label}}</label> \
<div class="controls"> \
<div class="input-append"> \
<input type="text" value="{{value}}" name="{{fieldId}}" class="span4" data-filter-field="{{fieldId}}" data-filter-id="{{id}}" data-filter-type="term" /> \
<a class="btn js-remove-filter"><i class="icon-remove"></i></a> \
</div> \
</div> \
</div> \
{{/termFilters}} \
</div> \
<div class="span4"> \
<p>To add a filter use the column menu in the grid view.</p> \
<button type="submit" class="btn">Update</button> \
</div> \
</form> \
</div> \
</div> \
',
events: {
'click .js-hide': 'onHide',
'click .js-remove-filter': 'onRemoveFilter',
'submit form': 'onTermFiltersUpdate'
},
initialize: function() {
this.el = $(this.el);
_.bindAll(this, 'render');
this.model.bind('change', this.render);
this.model.bind('change:filters:new-blank', this.render);
this.render();
},
render: function() {
var tmplData = $.extend(true, {}, this.model.toJSON());
// we will use idx in list as there id ...
tmplData.filters = _.map(tmplData.filters, function(filter, idx) {
filter.id = idx;
return filter;
});
tmplData.termFilters = _.filter(tmplData.filters, function(filter) {
return filter.term !== undefined;
});
tmplData.termFilters = _.map(tmplData.termFilters, function(filter) {
var fieldId = _.keys(filter.term)[0];
return {
id: filter.id,
fieldId: fieldId,
label: fieldId,
value: filter.term[fieldId]
};
});
var out = $.mustache(this.template, tmplData);
this.el.html(out);
// are there actually any facets to show?
if (this.model.get('filters').length > 0) {
this.el.show();
} else {
this.el.hide();
}
},
onHide: function(e) {
e.preventDefault();
this.el.hide();
},
onRemoveFilter: function(e) {
e.preventDefault();
var $target = $(e.target);
var filterId = $target.closest('.filter').attr('data-filter-id');
this.model.removeFilter(filterId);
},
onTermFiltersUpdate: function(e) {
var self = this;
e.preventDefault();
var filters = self.model.get('filters');
var $form = $(e.target);
_.each($form.find('input'), function(input) {
var $input = $(input);
var filterIndex = parseInt($input.attr('data-filter-id'));
var value = $input.val();
var fieldId = $input.attr('data-filter-field');
filters[filterIndex].term[fieldId] = value;
});
self.model.set({filters: filters});
self.model.trigger('change');
}
});
my.FacetViewer = Backbone.View.extend({
className: 'recline-facet-viewer well',
template: ' \
<a class="close js-hide" href="#">&times;</a> \
<div class="facets row"> \
<div class="span1"> \
<h3>Facets</h3> \
</div> \
{{#facets}} \
<div class="facet-summary span2 dropdown" data-facet="{{id}}"> \
<a class="btn dropdown-toggle" data-toggle="dropdown" href="#"><i class="icon-chevron-down"></i> {{id}} {{label}}</a> \
<ul class="facet-items dropdown-menu"> \
{{#terms}} \
<li><a class="facet-choice js-facet-filter" data-value="{{term}}">{{term}} ({{count}})</a></li> \
{{/terms}} \
{{#entries}} \
<li><a class="facet-choice js-facet-filter" data-value="{{time}}">{{term}} ({{count}})</a></li> \
{{/entries}} \
</ul> \
</div> \
{{/facets}} \
</div> \
',
events: {
'click .js-hide': 'onHide',
'click .js-facet-filter': 'onFacetFilter'
},
initialize: function(model) {
_.bindAll(this, 'render');
this.el = $(this.el);
this.model.facets.bind('all', this.render);
this.model.fields.bind('all', this.render);
this.render();
},
render: function() {
var tmplData = {
facets: this.model.facets.toJSON(),
fields: this.model.fields.toJSON()
};
tmplData.facets = _.map(tmplData.facets, function(facet) {
if (facet._type === 'date_histogram') {
facet.entries = _.map(facet.entries, function(entry) {
entry.term = new Date(entry.time).toDateString();
return entry;
});
}
return facet;
});
var templated = $.mustache(this.template, tmplData);
this.el.html(templated);
// are there actually any facets to show?
if (this.model.facets.length > 0) {
this.el.show();
} else {
this.el.hide();
}
},
onHide: function(e) {
e.preventDefault();
this.el.hide();
},
onFacetFilter: function(e) {
var $target= $(e.target);
var fieldId = $target.closest('.facet-summary').attr('data-facet');
var value = $target.attr('data-value');
this.model.queryState.addTermFilter(fieldId, value);
}
});
/* ========================================================== */
// ## Miscellaneous Utilities
var urlPathRegex = /^([^?]+)(\?.*)?/;
// Parse the Hash section of a URL into path and query string
my.parseHashUrl = function(hashUrl) {
var parsed = urlPathRegex.exec(hashUrl);
if (parsed === null) {
return {};
} else {
return {
path: parsed[1],
query: parsed[2] || ''
};
}
};
// Parse a URL query string (?xyz=abc...) into a dictionary.
my.parseQueryString = function(q) {
if (!q) {
return {};
}
var urlParams = {},
e, d = function (s) {
return unescape(s.replace(/\+/g, " "));
},
r = /([^&=]+)=?([^&]*)/g;
if (q && q.length && q[0] === '?') {
q = q.slice(1);
}
while (e = r.exec(q)) {
// TODO: have values be array as query string allow repetition of keys
urlParams[d(e[1])] = d(e[2]);
}
return urlParams;
};
// Parse the query string out of the URL hash
my.parseHashQueryString = function() {
q = my.parseHashUrl(window.location.hash).query;
return my.parseQueryString(q);
};
// Compse a Query String
my.composeQueryString = function(queryParams) {
var queryString = '?';
var items = [];
$.each(queryParams, function(key, value) {
items.push(key + '=' + value);
});
queryString += items.join('&');
return queryString;
};
my.getNewHashForQueryString = function(queryParams) {
var queryPart = my.composeQueryString(queryParams);
if (window.location.hash) {
// slice(1) to remove # at start
return window.location.hash.split('?')[0].slice(1) + queryPart;
} else {
return queryPart;
}
};
my.setHashQueryString = function(queryParams) {
window.location.hash = my.getNewHashForQueryString(queryParams);
};
// ## notify
//
// Create a notification (a div.alert in div.alert-messsages) using provide messages and options. Options are:
//
// * category: warning (default), success, error
// * persist: if true alert is persistent, o/w hidden after 3s (default = false)
// * loader: if true show loading spinner
my.notify = function(message, options) {
if (!options) options = {};
var tmplData = _.extend({
msg: message,
category: 'warning'
},
options);
var _template = ' \
<div class="alert alert-{{category}} fade in" data-alert="alert"><a class="close" data-dismiss="alert" href="#">×</a> \
{{msg}} \
{{#loader}} \
<span class="notification-loader">&nbsp;</span> \
{{/loader}} \
</div>';
var _templated = $.mustache(_template, tmplData);
_templated = $(_templated).appendTo($('.recline-data-explorer .alert-messages'));
if (!options.persist) {
setTimeout(function() {
$(_templated).fadeOut(1000, function() {
$(this).remove();
});
}, 1000);
}
};
// ## clearNotifications
//
// Clear all existing notifications
my.clearNotifications = function() {
var $notifications = $('.recline-data-explorer .alert-messages .alert');
$notifications.remove();
};
})(jQuery, recline.View);