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javascriptsorting
SandBag_1996
SandBag_1996

Reputation: 1601

Sorting according to timestamp in javascript

I have two variables in my javascript. A message function : var message A timestamp function : var date(It is of type timestamp)..

Now I have an array which stores messages according to there timestamp. Something like 

    var input = []; //dynamic array to store both message and date
    var date = new Date(update.data.history[i].timestamp * 1000); //Getting from Json object
    var date_input = date.toLocaleTimeString();
    var message = update.data.history[i].message;
        for (i to length)
    {
        input.push({ key: date_input, value: message });     //Key refers to date, and value to message
    }
   input.sort(sort_by(key,true,parseInt));

My function sort_by

var sort_by = function(field, reverse, primer){

   var key = function (x) {return primer ? primer(x[field]) : x[field]};

   return function (a,b) {
       var A = key(a), B = key(b);
       return (A < B ? -1 : (A > B ? 1 : 0)) * [1, -1][+!!reverse];                  
   }
}

Now, I tried debugging with firebug and noticed my sorting function is not working. I am using timestamp as key but still no luck. Is there anyway I can sort it according to timestamp and then display it. I tried other sorting solutions on SO, but I guess there is another way to sort when there is datatype like timestamp?

Upvotes: 1

Views: 1415

Answers (2)

SandBag_1996
SandBag_1996

Reputation: 1601

The sorting function works perfectly. When I was debugging it with firebug, I saw on the console that even though date-input was "6-29-07 am", it was only taking 6 as the "key", therefore every entry on that particular day was assigned the same key. Therefore, sorting was not able to give the desired output. Therefore, I avoided new date() function in second line, directly took the timestamp as key, sorted accordingly, and then convert it into date-format. Silly error, but took some time.

Upvotes: 1

Zeta
Zeta

Reputation: 105885

In an object literal, you do not have to quote the key:

input.push({ key: date_input, value: message });

However, your function takes three arguments, which aren't given in an object-like notation, so the meaning of key is unknown and will result in a ReferenceError:

input.sort(sort_by(key,true,parseInt));
                   ^
ReferenceError: key is not defined

Use a string as argument instead and it should work:

input.sort(sort_by("key",true,parseInt));

Upvotes: 1

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