I'm trying to pass a parameter into a Backbone.js view, but I'm having trouble doing it.

I have a Backbone view as follows:

var DataTypesView = Backbone.View.extend({
    events:{
        'click .datatype': 'add'
    },
    initialize: function(){
        console.log(this.magic);
        this.render();
    },
    render: function(){
        console.log('printing template');
        console.log(this.templateString);

                    etc.
}});

Later, I crate the view as follows:

        dataTypesView = new DataTypesView({magic:true,el:$('#dataViewSpace'),templateString:'#template'});

It doesn't work. What I don't understand is why the el works just fine (and I can access it using jquery with this.$el.), yet this.magic and this.templateString are both undefined...

Is there any way that I can pass a parameter into a view in the way I'm trying to above?

On a related note - is there any way I can pass the render function in? I initially tried passing a render function in (and removing it from the backbone view class), but when that didn't work I tried passing in simple datatypes instead... I'm assuming that whatever needs to be done to pass in a parameter for my first question will work for passing in a function.

I'm trying to pass a parameter into a Backbone.js view, but I'm having trouble doing it.

I have a Backbone view as follows:

var DataTypesView = Backbone.View.extend({
    events:{
        'click .datatype': 'add'
    },
    initialize: function(){
        console.log(this.magic);
        this.render();
    },
    render: function(){
        console.log('printing template');
        console.log(this.templateString);

                    etc.
}});

Later, I crate the view as follows:

        dataTypesView = new DataTypesView({magic:true,el:$('#dataViewSpace'),templateString:'#template'});

It doesn't work. What I don't understand is why the el works just fine (and I can access it using jquery with this.$el.), yet this.magic and this.templateString are both undefined...

Is there any way that I can pass a parameter into a view in the way I'm trying to above?

On a related note - is there any way I can pass the render function in? I initially tried passing a render function in (and removing it from the backbone view class), but when that didn't work I tried passing in simple datatypes instead... I'm assuming that whatever needs to be done to pass in a parameter for my first question will work for passing in a function.

• javascript
• backbone.js
• backbone-views

3 Answers 3

EDIT - apparently this answer doesn't work in newer versions of Backbone.

I figured it out! T'was pretty straightforward... All it took was a quick check of the Backbone.js documentation... should have done that first.

The following parameters when passed in are automatically assigned to the view (AKA you can access them with this.variableName): model, collection, el, id, className, tagName and attributes

ALL OTHER VARIABLES can be accessed with this.options.variableName.

From my example above, I can get access to magic by using this.options.magic, instead of this.magic.

Yay!

stuff that is not unique to the framwork goes to options

look in

this.options.magic

In more recent version of Backbone (mine is 1.1.2) you can copy View constructor options this way:

initialize: function(options) {
  _.extend(this, _.pick(options, 'several', 'specific', 'options'));
}

Credits goes to this github issue.