Helper broken in Ember 1.10

问题

I was using custom Handlebars helper extending the functionality of 'if' block.

In Ember 1.10 this doesnt work anymore as there is no Ember.Handlebars.bind property which allowed binding to the property....

Ember.Handlebars.registerHelper('ifCond', function (a, b, options) {
    return Ember.Handlebars.bind.call(options, contexts[0], a, options, true, function(result) {
        return result === b
    });
});

The usage would be:

{{#ifCond property "value"}}
    {{some-other-component}}
{{else}}
    something other...
{{/ifCond}}

but this returns an error "Cannot read property 'call' of undefined"

Is there any way that I can bind to passed properties in helper? I cannot use registerBoundHelper because it doesn't support having child blocks... I wanted to use Component instead of helper but then I cannot use the {{else}} block...

This solution for the helper was previously taken from Logical operator in a handlebars.js {{#if}} conditional

回答1:

I actually managed to find a way to do it, so I'll write the answer for my own question...

Instead of using undocumented hacks, I used the proposed change: https://github.com/emberjs/ember.js/issues/10295

So my helper looks like this now:

Ember.Handlebars.registerBoundHelper('isSame', function(value1, value2) {
    return value1 === value2
});

and the usage:

{{#if (isSame property "value")}}
    {{some-other-component}}
{{else if (isSame property "otherValue"}}
    something other...
{{else}}
    something other...
{{/if}}

来源：https://stackoverflow.com/questions/28558696/helper-broken-in-ember-1-10

标签

ember.js

htmlbars