Dane Dane - 4 months ago 25
Javascript Question

Index of an array element in Mustache.js

This is what I'd like to do in Mustache.js but not seeing how with the documentation.

var view = {items:['Mercury','Venus','Earth','Mars']};
var template = "<ul> {{#items}}<li>{{i}} - {{.}}</li>{{/items}} </ul>";
var html = Mustache.to_html(template,view);


Desired output:

<ul>
<li>0 - Mercury</li>
<li>1 - Venus</li>
<li>2 - Earth</li>
<li>3 - Mars</li>
</ul>

Answer

An alternative solution, without fooling around with Mustache.js

Instead of fooling around with mustache you might as well use a <ol></ol> instead of <ul></ul>, that will prefix each item with index+1.

If you'd like you can use css to change the starting number to 0, and it will render exactly as you want. You can even change the dot after the number, to something such as " - ", and problem is solved.

<ol>
  <li>Mercury</li>
  <li>Venus</li>
  <li>Earth</li>
  <li>Mars</li>
</ol>

the above will render as:

1. Mercury
2. Venus
3. Earth
4. Mars

the Mustache.js way to do it

The proper method if you'd like to do it in mustache is to convert your array of strings to an array of objects, where index and string value is present.

// I wrote this from the back of my head, it's untested and not guaranteed
// to work without modifications, though the theory behind it is valid.


var array     = ["123","stackoverflow","abc"];
var obj_array = [];

for (idx in array)
   obj_array.push ({'index': idx, 'str': array[idx]});

var view     = {items: obj_array};
var template = "<ul>{{#items}}<li>{{index}} - {{str}}</li>{{/items}}</ul>";
var html     = Mustache.to_html(template,view);