Flatten javascript array of objects with underscore.js

Question

I have a javascript array of object that looks like this:

"partners":[{"username":"fangonk","profileImg":"fangonk.jpg"},
            {"username":"jane","profileImg":"jane.jpg"},
            {"username":"tom_jones","profileImg":"tom.jpg"}]

I would like to output the value of each array's key using the underscore library. So for each object, I'd like to output something that looks like this:

<h1>Username Value</h1><img src="profileImg Value here" />

With a .map() function, typically you'd have the callback return a value and then store the return value of the .map() call, which will be a new Array of whatever your function returned. — the system
– the system, Commented Feb 28, 2013 at 17:18
Ok, I can see that I was going about outputting the values in a weird way. I've restructured my question. — Thomas
– Thomas, Commented Feb 28, 2013 at 17:24

BLSully · Accepted Answer · 2013-02-28 17:32:58Z

1

A bit confused about your "source", but I think you're just trying to do this:

_.each(partners, function(p) { document.write('<h1>' + p.username + '</h1>\
  <img src="' + p.profileImg + '" alt="' + p.username + '" />'); }
//substitute some DOM method (e.g. jquery().append) for document.write

Is this the result you're looking for?

this would only be applicable if your source looked more like:

var partners = [{"username":"fangonk","profileImg":"fangonk.jpg"},
                {"username":"jane","profileImg":"jane.jpg"},
                {"username":"tom_jones","profileImg":"tom.jpg"}];

EDIT:

var someBiggerObject = { 
  partners: [
    {"username":"fangonk","profileImg":"fangonk.jpg"},
    {"username":"jane","profileImg":"jane.jpg"},
    {"username":"tom_jones","profileImg":"tom.jpg"}
  ]
};

_.each(someBiggerObject.partners, function(p) { document.write('<h1>' + p.username + '</h1>\
  <img src="' + p.profileImg + '" alt="' + p.username + '" />'); }
//substitute some DOM method (e.g. jquery().append) for document.write

edited Feb 28, 2013 at 17:32

answered Feb 28, 2013 at 17:25

BLSully

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1 Comment

Thomas Over a year ago

The partners array is an attribute in a larger JSON object, so restructuring it could be difficult. Is there anyway to accomplish what I am looking for? Is there a way to restructure with underscore first?

Shanimal · Accepted Answer · 2013-03-05 06:43:00Z

The right way to do this is _.template

Example

If your structure is like this:

var list = {"partners":[ 
    {"username":"fangonk","profileImg":"fangonk.jpg"},
    {"username":"jane","profileImg":"jane.jpg"},
    {"username":"tom_jones","profileImg":"tom.jpg"}
]};

You can create the repeated item template (note type="text/html")

<script type="text/html" id="userItemTemplate">
    <h1><%= username %></h1><img src='<%= profileImg %>' />
</script>

and put each item into the template via a loop

var uIT = $("#userItemTemplate").html();
_.each(list.partners,function(user){
    $("#target").append(_.template(uIT,user));        
});

OR

put the loop into your template

<script type="text/html" id="userTemplate">
    <% _.each(partners,function(user,key,list){ %>
    <h1><%= user.username %></h1><img src='<%= user.profileImg %>' />
    <% }); %>
</script>

then push the whole array in

var uT = $("#userTemplate").html();
$("#target2").html(_.template(uT,list));

Note that I am using lodash instead of underscore. It's compatible for the most part, but I prefer lodash because the benchmarks are faster and the library is maintained well.

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