更新时间:2023-11-02 13:22:04
这是正确的方法:
< template name =list>
< ul>
{{#each items}}
< li> {{itemContents}}< / li>
{{else}}
< li class =placeholder>此列表中没有项目。< / li>
{{/ each}}
< ul>
< / template>
有关详细信息,请参阅 handlebarsjs.com 。
(流星使用 Spacebars ,它的灵感来自Handlebars,所以Syntax几乎相同。)
I want to do something like this:
<template name="list">
<ul>
{{#if items}}
{{#each items}}
<li>{{itemContents}}</li>
{{/each}}
{{else}}
<li class="placeholder">There are no items in this list.</li>
{{/if}}
<ul>
</template>
where items
is a Meteor.cursor:
Template.list.items = function() {
return Items.find();
};
However, the code above doesn't work, as the conditional will evaluate positively even if there are no items (which is mildly surprising because Handlebars evaluates []
as falsey). I tried changing the condition to
{{#if items.count}}
but then I get the cryptic error
Unknown helper 'items'
So, is there a way to write such a condition within a meteor Handlebars template?
This would be the correct way to go:
<template name="list">
<ul>
{{#each items}}
<li>{{itemContents}}</li>
{{else}}
<li class="placeholder">There are no items in this list.</li>
{{/each}}
<ul>
</template>
For further information take a look at handlebarsjs.com.
(Meteor uses Spacebars which is inspired by Handlebars. So the Syntax is almost the same.)