如何向视图传递参数

我有一系列的按钮，当点击显示一个弹出式菜单位于下面的按钮。我希望将按钮的位置传递给视图。我该怎么做？

ItemView = Backbone.View.extend({
tagName: 'li',
events: {
'click': 'showMenu'
},
initialize: function() {
_.bindAll(this, 'render');
},
render: function() {
return $(this.el).html(this.model.get('name'));
},
showMenu: function() {
var itemColl = new ItemColl();
new MenuView({collection: itemColl}); // how to pass the position of menu here?
}
});
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小开

Add an options argument to initialize:

initialize: function(options) {
// Deal with default options and then look at options.pos
// ...
},

And then pass in some options when you create your view:

var v = new ItemView({ pos: whatever_it_is});

For more information: http://backbonejs.org/#View-constructor

小开
最佳答案

You just need to pass the extra parameter when you construct the MenuView. No need to add the initialize function.

new MenuView({
collection: itemColl,
position: this.getPosition()
})

And then, in MenuView, you can use this.options.position.

UPDATE: As @mu is too short states, since 1.1.0, Backbone Views no longer automatically attach options passed to the constructor as this.options, but you can do it yourself if you prefer.

So in your initialize method, you can save the options passed as this.options:

initialize: function(options) {
this.options = options;
_.bindAll(this, 'render');
},

or use some finer ways as described by @Brave Dave.

小开

pass from other location 

 new MenuView({
collection: itemColl,
position: this.getPosition()
})

Add an options argument to initialize in view you are getting that passed variable,

initialize: function(options) {
// Deal with default options and then look at options.pos
// ...
},

to get the value use - 

   var v = new ItemView({ pos: this.options.positions});
小开

As of backbone 1.1.0, the options argument is no longer attached automatically to the view (see issue 2458 for discussion). You now need to attach the options of each view manually:

MenuView = Backbone.View.extend({
initialize: function(options) {
_.extend(this, _.pick(options, "position", ...));
}
});


new MenuView({
collection: itemColl,
position: this.getPosition(),
...
});

Alternatively you can use this mini plugin to auto-attach white-listed options, like so:

MenuView = Backbone.View.extend({
options : ["position", ...] // options.position will be copied to this.position
});
小开

Use this.options to retrieve argumentr in view 

 // Place holder
<div class="contentName"></div>


var showNameView = Backbone.View.extend({
el:'.contentName',
initialize: function(){
// Get name value by this.options.name
this.render(this.options.name);
},
render: function(name){
$('.contentName').html(name);
}
});


$(document).ready(function(){
// Passing name as argument to view
var myName1 = new showNameView({name: 'Nishant'});
});

Working Example: http://jsfiddle.net/Cpn3g/1771/


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