Despite the underscore template documentation suggesting that this should be possible, I am experiencing difficulties with it. When I try to execute the template, it does not return any output.
<% FB.api('/me', function(response){ %>
<%= response.name %>
<% }); %>
This template is completely valid; the compiled JavaScript version is shown below:
function(obj) {
var __p = '';
var print = function() { __p += Array.prototype.join.call(arguments, '') };
with(obj || {}) {
__p += '\n';
FB.api('/me', function(response) {
__p += '\n' + response.name + '\n';
});
__p += '\n';
}
return __p;
}
Everything looks good so far. By the way, you can view the JavaScript code for the template by accessing the source property of a compiled Underscore template:
var t = _.template(raw_template);
console.log(t.source);
However, there's a catch. The issue arises because the FB.api call is asynchronous. Here's what actually happens:
FB.api is called asynchronously.To resolve this, you need to restructure your logic. Move the FB.api call outside of the template like this:
var t = _.template(...);
FB.api('/mu', function(response) {
var html = t({ response: response });
// Add the html to the DOM here
});
This change ensures that the template is only used once all the necessary data is available.
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