How to Resolve 'Underscore Template Variable Not Defined' Errors in Backbone.js?

Underscore Template Variable Not Defined Error

In Backbone.js, using Underscore templates to populate data into HTML can result in an error if the template variables are not defined. This issue arises when attempting to render a template using the older syntax of Underscore 1.6 and below, which allowed direct parsing and filling of templates in one step.

var html = _.template('<%= lat %> <%= lon%>', data);

However, in Underscore 1.7 and above, the second argument to _.template serves as template options rather than the data itself. To correctly render the template, it must be compiled first, and then the compiled function can be executed with the data.

var tmpl = _.template('<%= lat %> <%= lon %>');
var html = tmpl(data);

To resolve the "variable not defined" error, update the Backbone.js application to use the correct template compilation syntax as demonstrated above. By following these updated template handling techniques, Backbone.js developers can ensure their templates are rendered properly and avoid template-related errors.

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