CODEWITHSUNDEEP
javascriptloopsif-statementhandlebars.js
mattpilott
mattpilott

Reputation: 356

How to check whether object is empty in handlebars if statement?

In handlebars i need to check if an object is empty and if it isn't then i need to run a loop to grab the content from the object. Below is my code and a link to codepen. I imagine this is quite simple but nothing seems to work. I would have thought that the handlebars #if statement would see an empty object as undefined or 0 and ultimately the condition would be unfulfilled.

<div class="temp"></div>

<script id="temp" type="x-handlebars-template">
    {{#if tabs}}
    <p>true</p>
    {{/if}}
</script>

var template = Handlebars.compile($("#temp").html());

var tabs = {};

var context = {
    tabs: tabs
}

$('.temp').html(template(context));

http://codepen.io/matt3224/pen/gaKyKv?editors=101

Upvotes: 4

Views: 14289

Answers (1)

Nick Bartlett
Nick Bartlett

Reputation: 4975

You can just use the built in handlebars each helper to accomplish what you're looking for, and you can even conditionally render something with an empty object:

var template = Handlebars.compile($("#temp").html());

var tabs = {},
    test = {a: "Resources", b: "Contact"};

var context = {
    tabs: tabs,
    test: test
}

$('.temp').html(template(context));
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/handlebars.js/3.0.0/handlebars.min.js"></script>

<div class="temp"></div>

<script id="temp" type="x-handlebars-template">
    <h3>each helper on empty object</h3>
    {{#each tabs}}
        <p>Key: {{@key}} Value = {{this}}</p>
    {{else}}
        <p>Your tabs object is empty!</p>
    {{/each}}
    
    <h3>each helper on non-empty object</h3>
    {{#each test}}
        <p>Key: {{@key}} Value = {{this}}</p>
    {{else}}
        <p>Your test object is empty!</p>
    {{/each}}
</script>

Upvotes: 3

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