You require custom data validation that cannot be accomplished via the built-in data annotation validation attributes – or – your data validation requires access to multiple properties in your model. Let’s explore how to leverage the IValidatableObject.
Blog
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Integrating Automapper with an MVC Result Filter
Please note this is an excerpt from Chapter 9 of my ASP.NET MVC 5 with Bootstrap and Knockout.js book. In this chapter I provide a brief overview of the 5 different MVC filters and then over the next two chapters provide detail examples of each. The following post is leveraging the example of a Result Filter.
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Convert the (un)check all to a #KnockoutJS Component
You’ve created a nice feature leveraging Knockout.js and now you want to re-use this feature on another page, another site, or in a slightly different fashion. This example will extend the previous (Un)Check All using Knockout.js and make it easily re-usable.
A Knockout component can be created using a mixture of HTML (with data bindings) and a Knockout ViewModel. By altering the previous check all example and making it slightly more re-usable, it can be easily added to other pages with minimal effort. If you are not already familiar with the example being extended, please take a minute and give the Knockout js tutorial a quick read with the link provided above.
Once the component is created, it can be included on any page with this simple HTML:
<checkall params=”items: items, selectedItems: selectedItems”></checkall>
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Replacing Radio Buttons with a Button Group using Bootstrap and #KnockoutJS
Radio buttons are hard-to-see, not easy to select, and let’s face it, quite mundane. You would like to JavaScript String replace() these radio buttons with a group of buttons that represent the same functionality, e.g. only one of the options may be selected at any given time.
Leveraging Bootstrap which provides many incredibly styled components for buttons, alert boxes, tables, forms, etc… regular radio buttons will be replaced by a button group (see screenshot below). This Knockout.js tutorial will be used to create a custom data binding that will make the group of buttons act like regular radio buttons (with a nicer look of course).
This example assumes you have a basic understanding of both Bootstrap and Knockout.js. If you don’t, feel free to explore my latest book ASP.NET MVC 5 with Bootstrap and Knockout.js for a great introduction, plus many more examples.
The versions used for this example are 3.3.4 for Bootstrap and 3.3 for Knockout.js. This example should be compatible with older versions of these frameworks. (more…)
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(Un)Check All using #KnockoutJS
When I wrote Knockout.js: Building Dynamic Client-Side Web Applications I was trying to focus on demonstrating specific things, such as custom bindings, extending observables, etc. Unfortunately this didn’t leave room for what I would call “random” examples of things that I do on a semi-regular basis. This blog post will demonstrate how to create a (un)check all list of checkboxes.
If I haven’t said it before, Knockout js examples like this are why I love working with this framework on a daily basis. This example is accomplished in under 50 lines of code, with most of it being whitespace for readability!
The following example assumes you understand how to install Knockout.js and have a brief understanding of Knockout ViewModels. If you are looking for a good introduction *cough* *cough*, my book does an excellent job of it 😉