How to properly create pagination with knockout.js component?

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by jasen , in category: Javascript , 14 days ago

How to properly create pagination with knockout.js component?

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1 answer

by darrion.kuhn , 14 days ago

@jasen 

To create pagination with Knockout.js, you can follow these steps:

  1. Create a Knockout.js component for the pagination control. This component should include a list of pages, a "next" button, a "previous" button, and any other relevant controls for navigating through the data.
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<div data-bind="foreach: pages">
  <button data-bind="text: $data, click: $parent.goToPage"></button>
</div>
<button data-bind="click: goToPrevious">Previous</button>
<button data-bind="click: goToNext">Next</button>


  1. In your main view model, define the logic for handling pagination. This includes tracking the current page number, calculating the total number of pages, and updating the data to display based on the current page.
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function ViewModel() {
  var self = this;

  self.currentPage = ko.observable(1);
  self.pageSize = 10;
  self.data = ko.observableArray([...]); // your array of data

  self.totalPages = ko.computed(function() {
    return Math.ceil(self.data().length / self.pageSize);
  });

  self.pages = ko.computed(function() {
    var pages = [];
    for (var i = 1; i <= self.totalPages(); i++) {
      pages.push(i);
    }
    return pages;
  });

  self.paginatedData = ko.computed(function() {
    var startIndex = (self.currentPage() - 1) * self.pageSize;
    var endIndex = startIndex + self.pageSize;
    return self.data.slice(startIndex, endIndex);
  });

  self.goToPage = function(page) {
    self.currentPage(page);
  };

  self.goToNext = function() {
    if (self.currentPage() < self.totalPages()) {
      self.currentPage(self.currentPage() + 1);
    }
  };

  self.goToPrevious = function() {
    if (self.currentPage() > 1) {
      self.currentPage(self.currentPage() - 1);
    }
  };
}

ko.applyBindings(new ViewModel());


  1. Include the pagination component in your HTML and bind it to the view model.
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<div data-bind="foreach: paginatedData">
  <div data-bind="text: $data"></div>
</div>
<pagination></pagination>


By following these steps, you can create a pagination system with Knockout.js that allows users to navigate through a large dataset efficiently.