// All our JS code will be under twitgraph.*
window['twitgraph'] = {};
try {
google.load('visualization', '1', {packages: ['areachart', 'piechart', "gauge"]});
google.setOnLoadCallback(twitgraph.Utils.createDelegate(twitgraph.Utils, twitgraph.Utils.onGvizLoaded));
} catch(e){}
// Global package holds some (very few) global javascript variables.
twitgraph.Globals = {
query_runner: null,
query_state: null
};
// The Utils class is the general container for all non-specific useful methods.
// The class contains only static methods.
twitgraph.Utils = {
/**
* Adds a script to the section of the page.
* @param url {String} the script url.
**/
addScript: function(url) {
var script = document.createElement("script");
script.setAttribute("src", url);
script.setAttribute("type", "text/javascript");
document.body.appendChild(script);
},
/**
* Creates and sends a jsonp call.
* @param url {String} urls of the jsonp call.
* @param callbackName
**/
jsonp: function(url, callbackName) {
url += '&callback=' + callbackName;
this.addScript(url);
},
onGvizLoaded: function() {
if (!this.initialized) {
this.init();
}
},
/**
* Initializes the page.
**/
init: function() {
twitgraph.Utils.log('start');
this.initialized = true;
twitgraph.Globals.query_state =
new twitgraph.QueryState(__twg_init_q,
__twg_init_dynamic_date,
this.parseDate(__twg_init_start),
this.parseDate(__twg_init_end),
__twg_init_duration,
__twg_init_show_text);
var qs = twitgraph.Globals.query_state;
if (qs.dynamic_date) {
var today = new Date();
var yday = new Date(today.getFullYear(), today.getMonth(), today.getDate() - 1);
qs.end = yday;
var aWeekAgo = new Date(today.getFullYear(), today.getMonth(), today.getDate() - 8);
qs.start = aWeekAgo;
var date_start = twitgraph.Utils.$('dateStart');
if (date_start) {
date_start.value = twitgraph.Utils.serializeDate(qs.start);
}
var date_end = twitgraph.Utils.$('dateEnd');
if (date_end) {
date_end.value = twitgraph.Utils.serializeDate(qs.end);
}
}
this.refresh();
},
/**
* The on-submit handler for the inputs form.
* Reads all data in the form fields and refreshes the page (graph and everything)
**/
onSubmit: function() {
// Gather input.
var dynamic_date = twitgraph.Utils.$('dateDynamic1').checked;
var start, end;
var duration = parseInt(twitgraph.Utils.$('duration').value);
if (dynamic_date) {
if (isNaN(duration)) {
alert("Uncool duration, dang!");
return;
}
var today = new Date();
var yday = new Date(today.getFullYear(), today.getMonth(), today.getDate() - 1);
end = yday;
start = new Date(yday.getFullYear(), yday.getMonth(), yday.getDate() - duration);
} else {
start = this.parseDate(this.$('dateStart').value);
end = this.parseDate(this.$('dateEnd').value);
if (!start || !end) {
alert("Uncool dates, dude!");
return;
}
}
var q = twitgraph.Utils.$('q').value;
var show_text = twitgraph.Utils.$('showText').checked;
twitgraph.Globals.query_state = new twitgraph.QueryState(q, dynamic_date, start, end, duration, show_text);
twitgraph.Utils.log(twitgraph.Globals.query_state);
this.refresh();
},
/**
* Refreshes the page elements.
* The page most current state is preserved in the query_state variable.
* This function reads the state from query_state and updates the various page elemetns by it.
**/
refresh: function() {
var qs = twitgraph.Globals.query_state;
twitgraph.Utils.log(qs);
this.query(qs);
var embed_code = twitgraph.Utils.$('embed-code');
if (embed_code) {
embed_code.value = this.getEmbedCode();
}
},
/**
* Queries the twitter search service.
*
* @param qs {QueryState} the query state object
**/
query: function(qs) {
twitgraph.Utils.time('query');
twitgraph.Globals.query_runner = new twitgraph.QueryRunner(qs);
twitgraph.Globals.query_runner.run();
},
/**
* A convenience for document.getElementById()
*
* @return {Object} A dom element by the el ID. null or undefined if that object doesn't exist.
**/
$: function(el) {
return document.getElementById(el);
},
/**
* Gets embed code for the current query_state.
*
* @return {String} The embedded code string.
**/
getEmbedCode: function() {
var qs = twitgraph.Globals.query_state;
var a = [];
a.push('TwitGraph for ');
a.push(qs.q);
a.push('
\n');
a.push('\n');
a.push('