Default value for a Handlebars` template placeholder

Question

Can I specify a default value for a Handlebars` template placeholder?

<script type="x-handlebars-template" id="menu-edit-form-tpl">     <form method="{{method}}" action="{{action}}" class="menu-edit-form"> ...                          </form> </script> 

Can I specify default values for {{method}} and {{action}} and skip them in the object that is passed to the compiled template?

Answer 1

Handlebars has no "default values".
You should use {{#if}} statement to check property is set.

<script type="x-handlebars-template" id="menu-edit-form-tpl">     <form method="{{#if method}}{{method}}{{else}}POST{{/if}}" action="{{#if action}}{{action}}{{else}}/{{/if}}" class="menu-edit-form"> ...     </form> </script> 

Or if you want a bit cleaner syntax, use the simple helper:

Handlebars.registerHelper('safeVal', function (value, safeValue) {     var out = value || safeValue;     return new Handlebars.SafeString(out); }); 

which allows you to write like this:

<script type="x-handlebars-template" id="menu-edit-form-tpl">     <form method="{{safeVal method 'POST'}}" action="{{safeVal action '/'}}" class="menu-edit-form"> ...     </form> </script>