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/*
jQuery Plugin spy (leftlogic.com/info/articles/jquery_spy2)
(c) 2006 Remy Sharp (leftlogic.com)
$Id$
*/
var spyRunning = 1;
$.fn.spy = function(settings) {
var spy = this;
spy.epoch = new Date(1970, 0, 1);
spy.last = '';
spy.parsing = 0;
spy.waitTimer = 0;
spy.json = null;
if (!settings.ajax) {
alert("An AJAX/AJAH URL must be set for the spy to work.");
return;
}
spy.attachHolder = function() {
// not mad on this, but the only way to parse HTML collections
if (o.method == 'html')
$('body').append('<div style="display: none!important;" id="_spyTmp"></div>');
}
// returns true for 'no dupe', and false for 'dupe found'
// latest = is latest ajax return value (raw)
// last = is previous ajax return value (raw)
// note that comparing latest and last if they're JSON objects
// always returns false, so you need to implement it manually.
spy.isDupe = function(latest, last) {
if ((last.constructor == Object) && (o.method == 'html'))
return (latest.html() == last.html());
else if (last.constructor == String)
return (latest == last);
else
return 0;
}
spy.parse = function(e, r) {
spy.parsing = 1; // flag to stop pull via ajax
if (o.method == 'html') {
$('div#_spyTmp').html(r); // add contents to hidden div
} else if (o.method == 'json') {
eval('spy.json = ' + r); // convert text to json
}
if ((o.method == 'json' && spy.json.constructor == Array) || o.method == 'html') {
if (spy.parseItem(e)) {
spy.waitTimer = window.setInterval(function() {
if (spyRunning) {
if (!spy.parseItem(e)) {
spy.parsing = 0;
clearInterval(spy.waitTimer);
}
}
}, o.pushTimeout);
} else {
spy.parsing = 0;
}
} else if (o.method == 'json') { // we just have 1
eval('spy.json = ' + r)
spy.addItem(e, spy.json);
spy.parsing = 0;
}
}
// returns true if there's more to parse
spy.parseItem = function(e) {
if (o.method == 'html') {
// note: pre jq-1.0 doesn't return the object
var i = $('div#_spyTmp').find('div:first').remove();
if (i.size() > 0) {
i.hide();
spy.addItem(e, i);
}
return ($('div#_spyTmp').find('div').size() != 0);
} else {
if (spy.json.length) {
var i = spy.json.shift();
spy.addItem(e, i);
}
return (spy.json.length != 0);
}
}
spy.addItem = function(e, i) {
if (! o.isDupe.call(this, i, spy.last)) {
spy.last = i; // note i is a pointer - so when it gets modified, so does spy.last
$('#' + e.id + ' > div:gt(' + (o.limit - 1) + ')').remove();
o.push.call(e, i);
$('#' + e.id + ' > div:first').fadeIn(o.fadeInSpeed);
}
}
spy.push = function(r) {
$('#' + this.id).prepend(r);
}
var o = {
limit: (settings.limit || 10),
ajax: settings.ajax,
timeout: (settings.timeout || 3000),
pushTimeout: (settings.pushTimeout || settings.timeout || 3000),
method: (settings.method || 'html').toLowerCase(),
push: (settings.push || spy.push),
fadeInSpeed: (settings.fadeInSpeed || 'slow'), // 1400 = crawl
customParameterName: settings.customParameterName,
customParameterValueCallback: settings.customParameterValueCallback,
isDupe: (settings.isDupe || spy.isDupe),
};
spy.attachHolder();
return this.each(function() {
var e = this;
var lr = ''; // last ajax return
var parameters = {};
spy.ajaxTimer = window.setInterval(function() {
if (spyRunning && (!spy.parsing)) {
var customParameterValue = o.customParameterValueCallback.call();
parameters[o.customParameterName] = customParameterValue;
$.get(o.ajax, parameters, function(r) {
spy.parse(e, r);
});
}
}, o.timeout);
});
};
function pauseSpy() {
spyRunning = 0; return false;
}
function playSpy() {
spyRunning = 1; return false;
}
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