如何在聚合物中表达(_?_:_)? [英] How can do an (_?_:_) expression in polymer?

问题描述

我在JSP中有这样的东西:

I have something like this in JSP:

<td>${job.invoiced ? "Y" : "N" }</td>

我将如何在Polymer 1.0中做一些等效的事情:

How would I do something equivalent in Polymer 1.0:

<td>{{job.invoiced ? "Y" : "N"}}</td>  <!-- does not work -->

推荐答案

解决问题的一种方法是定义一个名为iff的JS函数，然后在您的表达式中使用它:

One way to solve the problem is to define a JS function called iff and then use that in your expression:

<td>{{iff(j.invoiced, "&#9679;" ,"&#9675;")}}</td>

这是我定义iff函数的方式:

Here is how I defined the iff function:

<script>
    Polymer({
        is: "job-audit",
        properties: {
            jobs: {
                type: Array,
                notify: true
            }
        },
        iff(test,t,f){
            return test?t:f;
        }
    });
</script>

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