KnockoutJS: Utilizing the with-binding to connect a template to a designated Observable Array object at a specific index location

I am facing an issue where I want to pass a specific object within an ObservableArray defined in my view model to a template along with the index number.

This is how it looks in my view:

<!-- ko template: { name: "fooTemplate", with: FooCycles()[0] } --><!-- /ko -->

<script id="fooTemplate" type="text/html">
  //some HTML for an individual FooCycle here
</script>

However, I encountered an error stating

Uncaught ReferenceError: Unable to process binding "template: function (){return { name:"fooTemplate",with:FooCycles()[0]} }"
. Even though under the with binding, it still focuses on the parent VM it belongs to in the JS debugger (Chrome).

In my model definition, I have access to a specific array object that is used for various ko.computed properties:

var fstsum = parseFloat(self.FooCycles()[0].sum());
var sndsum = parseFloat(self.FooCycles()[1].sum());

I can successfully use FooCycles in a foreach:

<!-- ko foreach: FooCycles -->
  <div class="item">
    <!-- ko template: { name: "fooTemplate", with: $data } --><!-- /ko -->
  </div>
<!-- /ko -->

Accessing FooCycles()[0] works in JavaScript, but not in Knockout.js. Is there a way to retrieve an array object with an index in Knockout?

Answer №1

When using template binding, it's important to note that the documentation does not include with in the list of supported "additional" parameters.

However, the reason why with works with foreach is because:

data — an object provided as data for the template to render. If this parameter is omitted, KO will check for a foreach parameter or default to using your current model object.

To ensure compatibility, swap out with for data. In the case of foreach, simply leave it out entirely.

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