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POKnockout / Complex Object Issue
 

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  1. POKnockout / Complex Object Issue
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    <p>Let me preface this question by stating that I have only started working with the Knockout library yesterday afternoon so this quite possibly could be a factor in this issue.</p> <p>Before I get into the code, I am trying to create a model that a Competition object which has a Name property and a Criteria property which is a collection of Criterion objects. A Criterion object has a PrimaryDescription and SecondaryDescription property.</p> <p>Here is what I have so far:</p> <pre><code>function Competition(name, criteria) { var self = null; self = this; self.Name = ko.observable(name); self.Criteria = criteria; return; } function Criterion(id, primaryDescription, secondaryDescription) { var self = null; self = this; self.Id = id; self.PrimaryDescription = ko.observable(primaryDescription); self.SecondaryDescription = ko.observable(secondaryDescription); return; } </code></pre> <p>In the view model, I have a Competition property that is set up like this:</p> <pre><code>self.Competition = ko.observable(new Competition('Competition 1', ko.observableArray([new Criterion(-1, 'Criterion 1', 'Criterion 1'), new Criterion(-1, 'Criterion 2', 'Criterion 2')]))); </code></pre> <p>When the page loads, a binding to Competition().Criteria() works as expected.</p> <p>In the view model, I have added the following:</p> <pre><code>self.addCriterion = function () { self.Competition().Criteria().push(new Criterion(-1, '???', '???')); alert(self.Competition().Criteria().length); return; } </code></pre> <p>When I call this method, the new element gets added to the array and the array length is accurately reflected. However, the binding is not updated. I messed around a bit and changed the line in the Competition model part from "self.Criteria = criteria" to "self.Criteria = ko.observableArray(criteria)". When I do this and call the addCriterion method, the new element is added to the array and the binding updates the UI but the length of the array is reported as zero.</p> <p>Since I can only get this working halfway, this tells me I am doing something wrong. What am I missing?</p> <p>Many thanks in advance to whoever can steer me in the right direction.</p>
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    1. USJason Richmeier
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      1. USNickD
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    1. COCan you also include your html where you do the data-bind?
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      1. USYe Liu
    2. COHere's a jsfiddle of the solution I was working on - http://jsfiddle.net/djnattyp/Np2BY/4/
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      1. USNate
 

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