当字段为空时如何省略一行（使用小胡子/车把）

Question

我目前正在使用 mustache 并尝试实现一些基本的 if-else 检查。就我而言，我正在检查字段中的值。

例如：

我有这个 JSON 数据：

"AGENCIES":[
    {
        "IASTATE":"Buenos Aires",
        "IAADDRESS1":"Paraguay 647 Piso 4 Of. 17\/18",
        "IAADDRESS3":"",
        "IALEGALNAME":"Silvia Stocker Australia & New Zealand Travel (ANZ Group)",
        "IACOUNTRY":"Argentina",
        "IAPRINCIPALAGENT":"",
        "IAADDRESS2":"",
        "IAAGENCY":"Australia & New Zealand Group (ANZ Group)",
        "IAEMAIL":"info@anzgroup.com.ar",
        "IAPHONE":"+54 11 4311 9828",
        "IAWEBSITE":"http:\/\/www.anzgroup.com.ar\/education-105",
        "IACITY":"Buenos Aires",
        "IALOCATIONHEAD":"Cecilia Minzio"
    },
    {
        "IAAGENCY":"CW International Education",
        "IAADDRESS1":"Juan Francisco Segui 3967",
        "IAPRINCIPALAGENT":"",
        "IALOCATIONHEAD":"Carola Wober",
        "IACOUNTRY":"Argentina",
        "IACITY":"Buenos Aires",
        "IAPHONE":5.41148010867E11,
        "IAADDRESS2":"Piso 6A",
        "IAWEBSITE":"http:\/\/www.cwinternationaleducation.com",
        "IASTATE":"Buenos Aires",
        "IALEGALNAME":"CW International Education",
        "IAEMAIL":"info@cwinternationaleducation.com",
        "IAADDRESS3":"Ciduad Autonoma"
    }]

从上面的数据可以看出，有些字段可以是空的，比如地址 2，但有些数据总是有一个值，比如机构名称或国家或网站。

所以当字段为空时，如何省略整个“行”？类似：

<h3>{{IAAGENCY}}<h3>
{{if IAADDRESS2 is not empty}}<span>{{IAADDRESS2}}</span><br />{{/if}}
<span>{{IACOUNTRY}}</span><br />
<span>{{IAWEBSITE}}</span>

谢谢

Answer 1

使用handlebars 可以检查所述json值的长度：

<h3>{{IAAGENCY}}<h3>
{{#if IAADDRESS2.length}}<span>{{IAADDRESS2}}</span><br>{{/if}}
<span>{{IACOUNTRY}}</span><br />
<span>{{IAWEBSITE}}</span>

如果长度为0，则计算结果为false，因此该行被省略