Issues connecting tables to Knockout group

I seem to be encountering some difficulties with the Knockout table bindings in my code. Here is a snippet that I am struggling with:

Snippet:

$(function () {

    var FileObject = function(id, name) {
        this.id = id;
        this.name = name;
    };

    var FilesModel = function() {

        this.filesSelected = ko.observable(false);  
        this.myFiles = ko.observableArray([new FileObject(1, 'test_1')]);
        this.myFiles.push(new FileObject(2, 'test_2'));
    };

    var filesModel = new FilesModel();
    window.filesModel = filesModel;
    ko.applyBindings(filesModel);

    filesModel.myFiles().push(new FileObject(3, 'test_3')); // This doesn't seem to work

    alert(filesModel.myFiles().length); // It shows 3 items
});

Issue:

<h3>TABLE 1</h3>
<table> 
<tbody data-bind="foreach: myFiles">
    <tr>
        <td>FILE:</td>
        <td data-bind="text: name"></td>
    </tr>    
</tbody>
</table>

<h3>TABLE 2</h3>
<table>
<tbody data-bind="foreach: myFiles()">
    <tr>
        <td>FILE:</td>
        <td data-bind="text: name"></td>
    </tr>    
</tbody>
</table>

Despite setting up the tables correctly, only the first two files are displaying and the third one is missing. Can anyone pinpoint what might be causing this issue?

Answer №1

Almost there! Just a couple of things to note:

  1. Trying to access the status as an observable by using text: status() won't work because status is not directly observable.
  2. Instead of pushing the new FileObject into an unwrapped array, try pushing it directly into the observable array for better results.

Check out this jsbin example I made based on your original code.

Specifically, replace this line:

filesModel.myFiles().push(new FileObject(3, 'test_3')); // This never shows

With this corrected line:

filesModel.myFiles.push(new FileObject(3, 'test_3')); // Now it does

Answer №2

When working on your HTML code, attempting to data-bind status() resulted in an error because status is not actually an observable. One solution to this issue is to ensure that your FileObject members are observables themselves. Additionally, the third instance of FileObject was not displaying as intended due to a syntax mistake. Instead of using filesModel.myFiles().push, the correct syntax should be filesModel.myFiles.push

For a visual representation of the updated code, please refer to this revised fiddle

$(function () {
    var FileObject = function(id, name, size, status, progress) {
        this.id = ko.observable(id);
        this.name = ko.observable(name);
        this.status = ko.observable(status);
    };

    var FilesModel = function() {

        this.filesSelected = ko.observable(false);  
        this.myFiles = ko.observableArray([new FileObject(1, 'test_1')]);
        this.myFiles.push(new FileObject(2, 'test_2', 3, 'status'));
    };

    var filesModel = new FilesModel();
    window.filesModel = filesModel;
    ko.applyBindings(filesModel);

    filesModel.myFiles.push(new FileObject(3, 'test_3')); // This never shows

    alert(filesModel.myFiles().length); // Shows 3 items

});

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