Implementing dynamic image insertion on click using a knockout observable

I'm utilizing an API to retrieve images, and I need it to initially load 10 images. When a button is clicked, it should add another 10 images. This is how I set it up:

Defining the observable for the image amount:

public imageAmount: KnockoutObservable<number> = ko.observable(10);

In this section, I slice the array based on the imageAmount variable, which functions properly.

var images = response.data.slice(0, this.imageAmount()).map((data: IImageData) =>
        {
            return {
                big: 'http://d1ftcqzt8gr3o4.cloudfront.net/'+ data.big,
                thumb: 'http://d1ftcqzt8gr3o4.cloudfront.net/'+ data.thumb
            }
        });

Subsequently, when the button is clicked, I update the imageAmount observable by adding 10 more images.

public moreImages(): void
{
    this.viewModel.imageAmount(this.viewModel.imageAmount() + 10);

}

Although the count increases, the additional images are not being added. How can I resolve this?

HTML code:

View HTML format on pastebin as it couldn't be displayed correctly here

Answer №1

If you want to dynamically bind attributes, you can achieve this using attribute bindings:

data-bind="attr:{href: $data.url}"

Sample Usage

Demo Link

var DataModel = function(title, link) {
  this.links_arr = ko.observableArray([{
    id: 1,
    url: "https://www.example1.com/image.jpg"
  }, {
    id: 2,
    url: "https://www.example2.com/logo.png"
  }, {
    id: 3,
    url: "https://www.example3.com/icon.png"
  }])
};

ko.applyBindings(new DataModel("Page", "Link Page")); 
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.1.0/knockout-min.js"></script>
<div class='sampleExample' data-bind="foreach:links_arr">
  <p data-bind="text:$data.id"></p>
  <img data-bind="attr:{src: $data.url}" alt="">
</div>

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