Mustache - How to detect array is not empty?

问题

I want to implement the following logic with Mustache:

{{#if users.length > 0}}
    <ul>
        {{#users}}
            <li>{{.}}</li>
        {{/users}}
    </ul>
{{/if}}

// eg. data = { users: ['Tom', 'Jerry'] }

Should I modify the users structure to meet the need? For example:

{{#hasUsers}}
    <ul>
        {{#users}}
            <li>{{.}}</li>
        {{/users}}
    </ul>
{{/hasUsers}}

// eg. data = { hasUsers: true, users: ['Tom', 'Jerry'] }

回答1:

Sorry, this may be too late. But I had similar requirement and found a better way to do this:

{{#users.length}}
    <ul>
        {{#users}}
            <li>{{.}}</li>
        {{/users}}
    </ul>
{{/users.length}}
{{^users.length}}
    <p>No Users</p>
{{/users.length}}

Working sample here: http://jsfiddle.net/eSvdb/

回答2:

Using {{#users.length}} works great if you want the inner statement to repeat for every element of the array, but if you only want a statement to only run once, you can use:

{{#users.0}}
...
{{/users.0}}
{{^users.0}}
...
{{/users.0}}

来源：https://stackoverflow.com/questions/11653764/mustache-how-to-detect-array-is-not-empty