我刚刚开始研究backboneJS,并且已经开始在codepen 中构建一个小型文本应用程序(http://codepen.io/azaslavsky/pen/fJghE)。一切都很顺利,除了我有一个问题:一旦用户点击提交按钮,我希望表单容器视图:
- 解析所有表单域。这些是多种模型类型(标题字段、所见即所得的文本编辑器等),以及一个集合(tagInput.collection - 用户放入的所有标签)
- 为用户提供给应用程序的所有这些数据创建一个标准化的 JSON 对象,以将其传递给服务器
目前,我正在尝试将 Backbone.Model 扩展为一个新的类“FormModel”,该类仅包含默认属性“value”。然后,我在我的主容器上创建了一个新集合,其中包括容器内的所有各种模型。因此,container.collection 的模型是 FormModel,但我尝试 .add() 的所有实际模型都是 FormModel 的扩展类。这可能吗?每当我尝试访问该集合时,它总是空的!我觉得我错过了理解底层逻辑指导骨干的一些关键部分,但我不能确切地说是什么!
(我认为是)相关代码附在下面。我的“迷你应用”最新版本的完整代码也链接在上面:
//LINE 9 in Full Code
// Generic, very simply model type for any type of form entry that we can extend
var FormModel = Backbone.Model.extend({
defaults: {
value: '',
}
});
//Input class definition
var input = {};
input.model = FormModel.extend({
defaults: {
placeHolder: 'Enter Title Here...',
class: '',
warn: 'a title',
size: '20px'
}
});
input.view = Backbone.View.extend({
events: {
'keypress input': 'checkKey',
'change input': 'updateValue'
},
initialize: function() {
_.bindAll(this, 'render', 'checkKey', 'doSubmit','updateValue');
this.render();
},
render: function() {
if (this.model.get('class')) {
$(this.el).addClass(this.model.get('class'));
}
$(this.el).append('<div class="clearButton inputClear"></div>');
$(this.el).append('<input type="text" placeHolder="'+this.model.get('placeHolder')+'" style="font-size: '+this.model.get('size')+'">');
this.clickable = true;
return this;
},
checkKey: function(e) {
if (e.keyCode === 13) {
this.doSubmit();
}
},
doSubmit: function() {
var thisVal = this.updateValue();
if (thisVal.length > 0) {
} else {
alert('Hey, you need to '+this.model.get('warn')+' before you can submit this post!');
}
},
updateValue: function() {
var thisVal = $('input', this.el).val();
this.model.set('value', thisVal);
return thisVal;
},
});
/*
*[...]
*/
//LINE 132 in Full Code
//Tag class definition
var tag = {};
tag.model = FormModel.extend({
defaults: {
title: '',
exists: false,
parent: $('#container'),
}
});
tag.view = Backbone.View.extend({
events: {
'click .clearButton': 'kill',
},
initialize: function() {
_.bindAll(this, 'render', 'kill');
this.render();
},
render: function() {
$(this.el).addClass('tagRow');
$(this.el).html(this.model.get('title'));
$(this.el).append('<div class="clearButton tagClose"></div>');
this.clickable = true;
return this;
},
kill: function() {
if (this.clickable) {
this.clickable = false;
var that = this;
$(this.el).animate({opacity: 0}, 500, function(){
$(that.el).remove();
this.model.destroy();
});
}
}
});
tag.collection = Backbone.Collection.extend({
model: tag.model,
});
/*
*[...]
*/
//LINE 214 in Full Code
//Container class definition
var container = {};
container.collection = Backbone.Collection.extend({
model: FormModel
});
container.model = Backbone.Model.extend({
});
container.view = Backbone.View.extend({
el: $('body'),
initialize: function() {
_.bindAll(this, 'render', 'appendItem', 'newTag', 'makeTagDialog', 'validate');
this.collection = new container.collection();
this.fields = [];
this.render();
},
render: function() {
$('body').append('<div id="container"></div>');
this.container = $('body #container');
var title = new input.model({
placeHolder: 'Enter Title Here...',
class: 'subArea titleArea',
warn: 'a title',
});
this.appendItem(new input.view({model: title}).el);
this.appendItem(new editor.view({model: new editor.model()}).el);
this.makeTagDialog();
var submitButton = new submit.view({model: new submit.model()});
this.listenTo(submitButton.model, 'change:counter', this.validate);
$(this.container).append(submitButton.el);
return this;
},
appendItem: function(view) {
this.collection.add(view.model);
$(this.container).append(view);
},
makeTagDialog: function() {
this.container.append('<div class="subArea tagDialog"></div>');
var tags = $('.tagDialog', this.container);
tags.append('<div class="tagArea"></div>');
var tagInput = new input.view({
model: new input.model({
placeHolder: 'Tag Your Post...',
class: 'tagInput',
warn: 'at least one tag',
size: '16px',
value: ''
})
});
tagInput.addTag = function() {
if (this.model.get('value').length) {
this.collection.add(new tag.model({
title: this.model.get('value')
}));
}
this.clearInput();
};
tagInput.model.on('change:value', tagInput.addTag, tagInput);
this.appendItem(tagInput.el);
$('.tagInput .clearButton').css('marginTop', '-2px');
tagInput.collection = new tag.collection();
tagInput.collection.on('add', this.newTag);
},
newTag: function(model) {
thisView = new tag.view({model: model});
thisView.parent = this;
$('.tagArea', this.container).append(thisView.el);
},
validate: function(){
alert('Form validation launched!');
var form = [];
this.collection.each(function(value) {
form.push(value);
});
}
});
new container.view({model: container.model});
})(jQuery);