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Two way databidning is not working with knockout ObservableArrays

I have following code, which has two functions.

var model = function()
var self = this;
self.inventoryItems = ko.observableArray();

myArray = ["Value1", "V1lue2", "Value3", "Value4"];
self.inventoryItems(myArray);

self.addItems = function(vm)
self.inventoryItems.push('New Item');


self.SaveInventory = function(data)
$('#htmlBlock').html(myArray);
console.log(myArray)
;

;

ko.applyBindings(new model());

ul
list-style: none;


li
margin-top: 5px;


.info-text,
a,
button
margin-top: 20px;


<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>

<ul data-bind="foreach: inventoryItems">
<li>
<input data-bind="value: $data" />
</li>
</ul>
<div>
<a data-bind="click: addItems">+ Add more</a>
</div>
<button type="submit" class="btn btn-accent" data-bind="click: SaveInventory">Save changes</button>
<div class='info-text' id="htmlBlock">
</div>

With this code my UI is initializing fine and when I click on 'Add more' , able to get a new text box and myArray/inventoryItems is also working fine.

But if I edit any item and save the value, I am not getting the update value back.

What am I missing?

1 Answer
1

There is no need for a separate reference to the underlying array in the observable array, it only confuses things. Read out the value by using self.inventoryItems().

self.inventoryItems()

A good way to see what your model looks like in real time is using an element with data-bind="text: ko.toJSON($data, null, 't')"

data-bind="text: ko.toJSON($data, null, 't')"

var model = function()
var self = this;
self.inventoryItems = ko.observableArray(["Value1", "V1lue2", "Value3", "Value4"]);

self.addItems = function(vm)
self.inventoryItems.push('New Item');


self.SaveInventory = function(data)
console.log(self.inventoryItems())
;

;

ko.applyBindings(new model());

ul
list-style: none;


li
margin-top: 5px;


.info-text,
a,
button
margin-top: 20px;


<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>

<ul data-bind="foreach: inventoryItems">
<li>
<input data-bind="value: $data" />
</li>
</ul>
<div>
<a data-bind="click: addItems">+ Add more</a>
</div>
<button type="submit" class="btn btn-accent" data-bind="click: SaveInventory">Save changes</button>
<pre class='info-text' data-bind="text: ko.toJSON($data, null, 't')">
</pre>

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