Sort the strings representing date values in Angular JS using the OrderBy function

Question

Sort the strings representing date values in Angular JS using the OrderBy function

I am facing a challenge in sorting some data based on date. The dates are currently stored as strings in the format dd-mm-yyyy.

To address this, I created a filter that converted the plain string of numbers from the US date format to the UK date format, for example, 01272012 to 27-01-2014. However, I encountered an issue where the ordering was still treating them as numeric strings, causing dates like 01-01-1990 to come before 02-01-2014.

Does anyone have any suggestions on how to properly sort this data using a filter?

Thank you!

Update

I discovered that the dates would be automatically sorted if formatted as yyyy-mm-dd. Therefore, I used orderBy:['date'] to arrange the data while continuing to utilize my original filter when displaying it.

In order to display the most recent dates first, I had to reverse the data by adding a - to my orderBy statement: orderBy:['-date'].

javascript angularjs date angularjs-orderby

Answer 1

Answer №1

When you need to sort using the orderBy filter, here's how you can do it. Your ng-repeat code would likely resemble this:

ng-repeat="item in items | orderBy: orderByDate"

Then in your controller, define the orderByDate function like this:

$scope.orderByDate = function(item) {
    var parts = item.dateString.split('-');
    var date = new Date(parseInt(parts[2], 
                        parseInt(parts[1]), 
                        parseInt(parts[0]));

    return date;
};

You have flexibility in implementing the function. In my case, I converted the string to a Date. The object returned from the orderByDate function is used for ordering using <, =, > operators.

EDIT: solution for :reverse

Since :reverse doesn't work with a function as input, you can create a custom function that returns the reversed value itself. In this scenario, using Date isn't feasible, so I opted to construct a number and return its negative:

$scope.orderByDate = function(item) {
    var parts = item.dateString.split('-');
    var number = parseInt(parts[2] + parts[1] + parts[0]);

    return -number;
};

Answer 2

When you need to sort using the orderBy filter, here's how you can do it. Your ng-repeat code would likely resemble this:

ng-repeat="item in items | orderBy: orderByDate"

Then in your controller, define the orderByDate function like this:

$scope.orderByDate = function(item) {
    var parts = item.dateString.split('-');
    var date = new Date(parseInt(parts[2], 
                        parseInt(parts[1]), 
                        parseInt(parts[0]));

    return date;
};

You have flexibility in implementing the function. In my case, I converted the string to a Date. The object returned from the orderByDate function is used for ordering using <, =, > operators.

EDIT: solution for :reverse

Since :reverse doesn't work with a function as input, you can create a custom function that returns the reversed value itself. In this scenario, using Date isn't feasible, so I opted to construct a number and return its negative:

$scope.orderByDate = function(item) {
    var parts = item.dateString.split('-');
    var number = parseInt(parts[2] + parts[1] + parts[0]);

    return -number;
};

Answer 3

Answer №2

let currentTime = Date.now(); currentTime = $filter('date')(currentTime, 'yyyy-MM-ddThh:mm:ss+hh:mm');

Afterwards, you can filter the data using the newly formatted date.

Answer 4

let currentTime = Date.now(); currentTime = $filter('date')(currentTime, 'yyyy-MM-ddThh:mm:ss+hh:mm');

Afterwards, you can filter the data using the newly formatted date.

Sort the strings representing date values in Angular JS using the OrderBy function

Answer №1

Answer №2

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