在backbone.js中创建向导进程
我是backbone.js新手，在设计“向导”类型的流程（也称为多步骤表单）时遇到了一些问题。该向导应该能够根据用户对问题的响应处理不同的屏幕分支逻辑，随着用户的进展存储对每个屏幕的响应，并最终能够将所有表单响应（每个步骤）序列化为一个大对象（可能是JSON）。向导问题每年都在变化，我需要能够同时支持多个存在的类似向导 我已经掌握了创建屏幕的基本知识（使用主干表单），但现在我想保存用户输入，我想不出最好的方法。我看到的大多数示例都有一种特定类型的对象（例如，在backbone.js中创建向导进程,backbone.js,Backbone.js,我是backbone.js新手，在设计“向导”类型的流程（也称为多步骤表单）时遇到了一些问题。该向导应该能够根据用户对问题的响应处理不同的屏幕分支逻辑，随着用户的进展存储对每个屏幕的响应，并最终能够将所有表单响应（每个步骤）序列化为一个大对象（可能是JSON）。向导问题每年都在变化，我需要能够同时支持多个存在的类似向导 我已经掌握了创建屏幕的基本知识（使用主干表单），但现在我想保存用户输入，我想不出最好的方法。我看到的大多数示例都有一种特定类型的对象（例如，Todo），您只需创建它们的集合（例如
TodoTodoList您需要做的一件大事是将工作流与视图本身分开。也就是说，您应该有一个对象来协调视图之间的工作流，保留在视图中输入的数据，并使用视图的结果（通过事件或其他方式）来确定下一步的方向 我在博客中更详细地介绍了这一点，这里有一个非常简单的向导式界面示例： 在这里： 以下是第一篇文章中的基本代码，其中显示了工作流对象及其如何协调视图：
orgChart = {
addNewEmployee: function(){
var that = this;
var employeeDetail = this.getEmployeeDetail();
employeeDetail.on("complete", function(employee){
var managerSelector = that.selectManager(employee);
managerSelector.on("save", function(employee){
employee.save();
});
});
},
getEmployeeDetail: function(){
var form = new EmployeeDetailForm();
form.render();
$("#wizard").html(form.el);
return form;
},
selectManager: function(employee){
var form = new SelectManagerForm({
model: employee
});
form.render();
$("#wizard").html(form.el);
return form;
}
}
// implementation details for EmployeeDetailForm go here
// implementation details for SelectManagerForm go here
// implementation details for Employee model go here
我认为德里克的回答是可以接受的，因为它比我现有的更干净，但这不是一个解决方案，因为我有50多个屏幕要处理，我无法进入好的模型-我已经得到了它们的内容，只需复制它们 下面是我提出的处理屏幕切换逻辑的黑客模型代码。我相信在我继续工作的过程中，我最终会对它进行更多的重构
var Wizard = Backbone.Model.extend({
initialize: function(options) {
this.set({
pathTaken: [0],
// instantiate the screen definitions as screenResponses
screenResponses: _(this.screens).map(function(s){ return new s; })
});
},
currentScreenID: function() {
return _(this.get('pathTaken')).last();
},
currentScreen: function() {
return this.screens[this.currentScreenID()];
},
isFirstScreen: function(screen) {
screen = screen || this.currentScreen();
return (_(this.screens).first() === screen);
},
// This function should be overridden by wizards that have
// multiple possible "finish" screens (depending on path taken)
isLastScreen: function(screen) {
screen = screen || this.currentScreen();
return (_(this.screens).last() === screen);
},
// This function should be overridden by non-trivial wizards
// for complex path handling logic
nextScreenID: function(currentScreenID, currentScreen) {
// default behavior is to return the next screen ID in the list
return currentScreenID + 1;
},
nextScreen: function() {
// return immediately if on final screen
if (this.isLastScreen()) return;
// otherwise get next screen id from nextScreenID function
nsid = this.nextScreenID(this.currentScreenID(), this.currentScreen());
if (nsid) {
this.get('pathTaken').push(nsid);
return nsid;
}
},
prevScreen: function() {
// return immediately if on first screen
if (this.isFirstScreen()) return;
// otherwise return the previous screen in the list
prevScreenID = _(_(this.get('pathTaken')).pop()).last();
return this.screens[prevScreenID];
}
});
var ChocolateWizard = Wizard.extend({
initialize: function(options) {
Wizard.prototype.initialize.call(this); // super()
this.set({
wizardType: 'Chocolate',
});
},
nextScreenID: function(csid, cs) {
var resp = this.screenResponses(csid);
this.nextScreenController.setState(csid.toString()); // have to manually change states
if (resp.nextScreenID)
// if screen defines a custom nextScreenID method, use it
return resp.nextScreenID(resp, this.get('screenResponses'));
else
// otherwise return next screen number by default
return csid + 1;
},
// convenience function
screenResponses: function(i) {
return this.get('screenResponses')[i];
},
screens: [
// 0
Backbone.Model.extend({
title : "Chocolate quiz",
schema: {
name: 'Text',
likesChocolate: {
title: 'Do you like chocolate?',
type: 'Radio',
options: ['Yes', 'No']
}
},
nextScreenID: function(thisResp, allResp) {
if (thisResp.get('likesChocolate') === 'Yes')
return 1;
else
return 2;
}
}),
// 1
Backbone.Model.extend({
title : "I'm glad you like chocolate!",
schema: {
chocolateTypePreference: {
title: 'Which type do you prefer?',
type: 'Radio',
options: [ 'Milk chocolate', 'Dark chocolate' ]
}
},
nextScreenID: function(thisResp, allResp) {
return 3; // skip screen 2
}
}),
// 2
Backbone.Model.extend({
title : "So you don't like chocolate.",
schema: {
otherSweet: {
title: 'What type of sweet do you prefer then?',
type: 'Text'
}
}
}),
// 3
Backbone.Model.extend({
title : "Finished - thanks for taking the quiz!"
}
]
});
w、 r.t显式Q，在此向导中，所有内容都存储在localStorage中，可以作为类似于指定格式的对象进行访问。Hello。你能解释一下你要拿什么吗？反应是什么样的？也许你可以举个例子？顺便说一句，这是一个很好的问题。您好，获取将用于检索用户以前保存的对向导问题的响应（这意味着我还必须有一个保存方法用于模型）。我很想给你一个例子，看看这个回复会是什么样子，但我似乎无法思考如何构造这个应用程序，从而给你这个答案。我需要一个更大的大脑@user1248256好的，多亏了你的问题，我对这个问题考虑得更多了，并对这个问题进行了编辑，以包含我最终希望保存的向导查询以JSON（大约）形式返回的内容。也许我必须创建一个新模型，或者修补主干网的一些同步或解析方法？+1，感谢您的回复。我读过这些博客文章，不幸的是，我认为这不适合我正在做的事情（假设我理解它）。我正在做的向导只是创建一个数据块，用于自动填充现有的非常大且结构不好的PDF文件，我与该文件紧密耦合，因此我无法将所有部分整理成漂亮的模型；实际上，拥有一组通用的“屏幕”更容易，因为我最终必须映射回PDF结构。很明显，要将这一点融入MVC式的结构很有挑战性。+1感谢你花在回答这个问题上的时间。。。来自一个上瘾的主干网用户：）您如何为这些视图设置来回逻辑？我很难理解如何使用“previous/next”逻辑扩展回调，而不需要大量冗余代码。
orgChart = {
addNewEmployee: function(){
var that = this;
var employeeDetail = this.getEmployeeDetail();
employeeDetail.on("complete", function(employee){
var managerSelector = that.selectManager(employee);
managerSelector.on("save", function(employee){
employee.save();
});
});
},
getEmployeeDetail: function(){
var form = new EmployeeDetailForm();
form.render();
$("#wizard").html(form.el);
return form;
},
selectManager: function(employee){
var form = new SelectManagerForm({
model: employee
});
form.render();
$("#wizard").html(form.el);
return form;
}
}
// implementation details for EmployeeDetailForm go here
// implementation details for SelectManagerForm go here
// implementation details for Employee model go here
var Wizard = Backbone.Model.extend({
initialize: function(options) {
this.set({
pathTaken: [0],
// instantiate the screen definitions as screenResponses
screenResponses: _(this.screens).map(function(s){ return new s; })
});
},
currentScreenID: function() {
return _(this.get('pathTaken')).last();
},
currentScreen: function() {
return this.screens[this.currentScreenID()];
},
isFirstScreen: function(screen) {
screen = screen || this.currentScreen();
return (_(this.screens).first() === screen);
},
// This function should be overridden by wizards that have
// multiple possible "finish" screens (depending on path taken)
isLastScreen: function(screen) {
screen = screen || this.currentScreen();
return (_(this.screens).last() === screen);
},
// This function should be overridden by non-trivial wizards
// for complex path handling logic
nextScreenID: function(currentScreenID, currentScreen) {
// default behavior is to return the next screen ID in the list
return currentScreenID + 1;
},
nextScreen: function() {
// return immediately if on final screen
if (this.isLastScreen()) return;
// otherwise get next screen id from nextScreenID function
nsid = this.nextScreenID(this.currentScreenID(), this.currentScreen());
if (nsid) {
this.get('pathTaken').push(nsid);
return nsid;
}
},
prevScreen: function() {
// return immediately if on first screen
if (this.isFirstScreen()) return;
// otherwise return the previous screen in the list
prevScreenID = _(_(this.get('pathTaken')).pop()).last();
return this.screens[prevScreenID];
}
});
var ChocolateWizard = Wizard.extend({
initialize: function(options) {
Wizard.prototype.initialize.call(this); // super()
this.set({
wizardType: 'Chocolate',
});
},
nextScreenID: function(csid, cs) {
var resp = this.screenResponses(csid);
this.nextScreenController.setState(csid.toString()); // have to manually change states
if (resp.nextScreenID)
// if screen defines a custom nextScreenID method, use it
return resp.nextScreenID(resp, this.get('screenResponses'));
else
// otherwise return next screen number by default
return csid + 1;
},
// convenience function
screenResponses: function(i) {
return this.get('screenResponses')[i];
},
screens: [
// 0
Backbone.Model.extend({
title : "Chocolate quiz",
schema: {
name: 'Text',
likesChocolate: {
title: 'Do you like chocolate?',
type: 'Radio',
options: ['Yes', 'No']
}
},
nextScreenID: function(thisResp, allResp) {
if (thisResp.get('likesChocolate') === 'Yes')
return 1;
else
return 2;
}
}),
// 1
Backbone.Model.extend({
title : "I'm glad you like chocolate!",
schema: {
chocolateTypePreference: {
title: 'Which type do you prefer?',
type: 'Radio',
options: [ 'Milk chocolate', 'Dark chocolate' ]
}
},
nextScreenID: function(thisResp, allResp) {
return 3; // skip screen 2
}
}),
// 2
Backbone.Model.extend({
title : "So you don't like chocolate.",
schema: {
otherSweet: {
title: 'What type of sweet do you prefer then?',
type: 'Text'
}
}
}),
// 3
Backbone.Model.extend({
title : "Finished - thanks for taking the quiz!"
}
]
});