Parent view model property which is observable assigned to child view model property property, when changed in child view model updating the parent but not updating the child property.

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Hi,

Here is my code.

HTML

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Name Widget.</title>
    <script src="scripts/jquery-2.1.1.min.js"></script>
    <script src="scripts/knockout-3.2.0.js"></script>
    <script>
        $(document).ready(function() {
            ko.components.register('name-widget', {
                viewModel: function (params) {
                    this.name = params.value(); //Getting the bind property.
                    params.value("Sumanth"); //Changing the parent property. (It changing the parent but not child property).
                },
                template: "<p>Your name is:<span data-bind='text: name'></span></p>"
            });

            function nameViewModel() {
                this.myName = ko.observable("Sudheer");
            }

            ko.applyBindings(new nameViewModel());
        })
    </script>
</head>
<body>
    Type in your name: <input type="text" data-bind="value: myName" />
    <span data-bind="text: myName"></span>
    
    <!--Widget-->
    <name-widget params="value: myName"></name-widget>
</body>
</html>

In the above example,
nameViewModel is parent viewmodel and viewModel in component is child view model. I bound the myName observable to value property of child view model , but when i change parent property , it is not updating the child property.

Posted 9-Dec-14 22:34pm

Sudheer Reddy K

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Sudheer Reddy K · Accepted Answer · 2014-12-10T00:12:00

Solution 1

Removing parenthesis in this.name=prams.value worked.

Explanation:

1.By the first way this.name=prams.value() , i'm assigning the value not the dependency.

2. So to assign the observable itself to the child property solved the issue.

Posted 10-Dec-14 0:12am

Sudheer Reddy K