直接在 Handlebars 模板中添加数组长度的 if 条件

Question

In my Handlebars template, I want to enable/disable a button based on "selectedRows" array length (ie enable if selectedRows > 0 and disable it otherwise ie on array length 0) I want to avoid introducing any extra instance variable in the component JS. Is it possible to do this directly in handlebars?

ie something like below

{{my-button count=selectedRows enabled=(if selectedRows > 0)}}

enabled is boolean (true/.false)

Answer 1

If you install the widely-used Ember Truth Helpers addon , you could have something like this:

{{my-button count=selectedRows enabled=(gt selectedRows 0)}}

Answer 2

If your requirement is just checking if length is greater than 0 , you could do, (assuming selectedRows is a Number ),

{{my-button count=selectedRows enabled=(if selectedRows true false)}}

Since JS considers 0 a falsy value, you could use it as the condition.