Does the variable declared in the render method of a Backbone.js View actually exist?

Whenever I create a new view object in this manner:

app.MyCollectionView = Backbone.View.extend({
  el: "#my-element",
  template: _.template($(#my-view-template).html()),

  render: function(){
    this.$el.append(this.template({
      "myTemplateVar": this.html_string
    }));
    var html_string = "<p>Some stuff here</p>";
  }
});

In the given code snippet, the issue arises with the variable "html_string". Despite its presence, it fails to have any impact on the rendering of the view, resulting in an empty "myTemplateVar". However, if "html_string" is defined as a parameter for the view, everything functions correctly. What could be causing this discrepancy?

Answer №1

Resolved Issue:

app.MyCollectionView = Backbone.View.extend({
    el: "#my-element",
    template: _.template($('#my-view-template').html()),

    render: function(){
        var html_string = "<p>Some content here</p>";

        this.$el.append(this.template({
            "myTemplateVar": html_string
        }));   
    }
});
  1. You mistakenly used the wrong selector argument in setting the template method
  2. To avoid errors, declare a variable and set its value before passing it to the object
  3. Ensure to call variables without using this.

Brief Explanation

this.$el.append(this.template({
  "myTemplateVar": this.html_string
}));

In the provided code snippet, the use of this in this.html_string points to the object being passed to the this.template method.

Answer №2

Upon invocation of the function, the context is established as the view. The html_string variable belongs to the render function rather than the view.

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