如何使这个javascript更容易从OO背景中阅读,维护和理解？
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我来自Java,C#等地.我正在为我的Web应用程序开发一个javascript报告引擎.我正在使用jQuery,AJAX等.我很难按照我认为他们应该的方式工作 – 例如,我已经去了看起来很麻烦,以确保当我进行AJAX调用时,我的回调已经访问对象的成员.那些回调函数不需要那么复杂,是吗？我知道我一定做错了.请指出我可以做得更好 – 让我知道所提供的片段是否太多/太少/太可怕了.
我正在尝试做什么：
>在页面加载时,我有一个完整的用户选择.
>我创建报告(现在为1)并将它们添加到选择框中.
>当选择用户和报告时,我运行报告.
>该报告涉及为每个联赛和锦标赛进行一系列电话会议 – 获得练习赛,联赛和锦标赛,它将获得所有这些系列赛,然后在每个系列赛中抓住所有比赛.
>它维护一个活动的呼叫计数器,当它们全部完成后,报告就会运行并显示给用户.
码：
//Initializes the handlers and reports
function loadUI() {
loadReports();
$("#userSelect").change(updateRunButton);
$("#runReport").click(runReport);
updateRunButton();
return;
$("#userSelect").change(loadUserGames);
var user = $("#userSelect").val();
if(user) {
getUserGames(user);
}
}
//Creates reports and adds them to the select
function loadReports() {
var reportSelect = $("#reportSelect");
var report = new SpareReport();
engine.reports[report.name] = report;
reportSelect.append($("<option/>").text(report.name));
reportSelect.change(updateRunButton);
}
//The class that represents the 1 report we can run right now.
function SpareReport() {
this.name = "Spare Percentages";
this.activate = function() {
};
this.canRun = function() {
return true;
};
//Collects the data for the report. Initializes/resets the class variables,
//and initiates calls to retrieve all user practices, leagues, and tournaments.
this.run = function() {
var rC = $("#rC");
var user = engine.currentUser();
rC.html("<img src='/img/loading.gif' alt='Loading...'/> <span id='reportProgress'>Loading games...</span>");
this.pendingOperations = 3;
this.games = [];
$("#runReport").enabled = false;
$.ajaxSetup({"error":(function(report) {
return function(event, XMLHttpRequest, ajaxOptions, thrownError) {
report.ajaxError(event, XMLHttpRequest, ajaxOptions, thrownError);
};
})(this)});
$.getJSON("/api/leagues", {"user":user}, (function(report) {
return function(leagues) {
report.addSeriesGroup(leagues);
};
})(this));
$.getJSON("/api/tournaments", {"user":user}, (function(report) {
return function(tournaments) {
report.addSeriesGroup(tournaments);
};
})(this));
$.getJSON("/api/practices", {"user":user}, (function(report) {
return function(practices) {
report.addSerieses(practices);
};
})(this));
};
// Retrieves the serieses (group of IDs) for a series group, such as a league or
// tournament.
this.addSeriesGroup = function(seriesGroups) {
var report = this;
if(seriesGroups) {
$.each(seriesGroups, function(index, seriesGroup) {
report.pendingOperations += 1;
$.getJSON("/api/seriesgroup", {"group":seriesGroup.key}, (function(report) {
return function(serieses) {
report.addSerieses(serieses);
};
})(report));
});
}
this.pendingOperations -= 1;
this.tryFinishReport();
};
// Retrieves the actual serieses for a series group. Takes a set of
// series IDs and retrieves each series.
this.addSerieses = function(serieses) {
var report = this;
if(serieses) {
$.each(serieses, function(index, series) {
report.pendingOperations += 1;
$.getJSON("/api/series", {"series":series.key}, (function(report) {
return function(series) {
report.addSeries(series);
};
})(report));
});
}
this.pendingOperations -= 1;
this.tryFinishReport();
};
// Adds the games for the series to the list of games
this.addSeries = function(series) {
var report = this;
if(series && series.games) {
$.each(series.games, function(index, game) {
report.games.push(game);
});
}
this.pendingOperations -= 1;
this.tryFinishReport();
};
// Checks to see if all pending requests have completed - if so, runs the
// report.
this.tryFinishReport = function() {
if(this.pendingOperations > 0) {
return;
}
var progress = $("#reportProgress");
progress.text("Performing calculations...");
setTimeout((function(report) {
return function() {
report.finishReport();
};
})(this), 1);
}
// Performs report calculations and displays them to the user.
this.finishReport = function() {
var rC = $("#rC");
//snip a page of calculations/table generation
rC.html(html);
$("#rC table").addClass("tablesorter").attr("cellspacing", "1").tablesorter({"sortList":[[3,1]]});
};
// Handles errors (by ignoring them)
this.ajaxError = function(event, XMLHttpRequest, ajaxOptions, thrownError) {
this.pendingOperations -= 1;
};
return true;
}
// A class to track the state of the various controls. The "series set" stuff
// is for future functionality.
function ReportingEngine() {
this.seriesSet = [];
this.reports = {};
this.getSeriesSet = function() {
return this.seriesSet;
};
this.clearSeriesSet = function() {
this.seriesSet = [];
};
this.addGame = function(series) {
this.seriesSet.push(series);
};
this.currentUser = function() {
return $("#userSelect").val();
};
this.currentReport = function() {
reportName = $("#reportSelect").val();
if(reportName) {
return this.reports[reportName];
}
return null;
};
}
// Sets the enablement of the run button based on the selections to the inputs
function updateRunButton() {
var report = engine.currentReport();
var user = engine.currentUser();
setRunButtonEnablement(report != null && user != null);
}
function setRunButtonEnablement(enabled) {
if(enabled) {
$("#runReport").removeAttr("disabled");
} else {
$("#runReport").attr("disabled", "disabled");
}
}
var engine = new ReportingEngine();
$(document).ready( function() {
loadUI();
});
function runReport() {
var report = engine.currentReport();
if(report == null) {
updateRunButton();
return;
}
report.run();
}
我即将开始添加新报告,其中一些报告仅对用户游戏的一部分进行操作.我将尝试使用子类(原型？),但如果我不知道如何简化其中一些…我不知道如何完成该句子.救命！
解决方法:
$.getJSON("/api/leagues", {"user":user}, (function(report) {
return function(leagues) {
report.addSeriesGroup(leagues);
};
})(this));
可以写成：
var self = this;
$.getJSON("/api/leagues", {"user":user}, (function(leagues) {
self.addSeriesGroup(leagues);
});
当你在循环中并希望绑定到每次循环变化的变量时,函数返回函数会更有用.
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