As the name specifies this binding makes the related DOM element to be visible or hidden based on the value passed in the binding.
Syntax
visible: <binding-condition>
Parameters
When the parameter transforms into false (like false/0/null/undefined), then the binding sets display:none for the element to making it as hidden.
When the parameter transforms into true (true/non-null/array ), the binding removes the element’s display value and makes it visible.
Example
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 |
<html> <head> <title>KnockoutJS Computed Observables</title> <script src="https://ajax.aspnetcdn.com/ajax/knockout/knockout-3.4.2.js"></script> </head> <body> <a href="#" data-bind="click: toggleVisibility">Show/Hide Text</a> <br/><br /> <div data-bind="visible: shouldShowMessage"> Welcome To Dotnet-helpers.com Learning Curve </div> <script type="text/javascript"> var viewModel = function () { this.shouldShowMessage = ko.observable(true); this.toggleVisibility = function () { this.shouldShowMessage(!this.shouldShowMessage()); alert('shouldShowMessage status ' + this.shouldShowMessage()); }; }; ko.applyBindings(new viewModel()); </script> </body> </html> |
OUTPUT
What do you think?
I hope you have idea of how to use KnockoutJS visible or hidden based on the value passed in the binding. I would like to have feedback from my posts readers. Your valuable feedback, question, or comments about this article are always welcome.