Get the calculated value from the server

Here is a sample model to consider:

public class ProfileViewModel
{
    public string LanguageCode { get; set; }
    public ProfileLocalizationViewModel CurrentLocalization { get; set; }
    public List<ProfileLocalizationViewModel> Localizations { get; set; }
}

I am trying to automatically retrieve the CurrentLocalization from the Localizations based on the LanguageCode. I am aware of the ko.computed() function, but since I will be passing a list of ProfileViewModel to the client, manually setting the CurrentLocalization as a computed property in knockout doesn't seem feasible. Is it possible to achieve this desired functionality? If not, what alternative approaches could I take to accomplish something similar? Any assistance would be greatly valued.

Answer №1

If the preference is for server-side implementation, you might consider something along these lines:

public class ProfileViewModel
{
    public string LanguageCode { get; set; }
    public ProfileLocalizationViewModel CurrentLocalization 
    { 
       get{
         return Localizations.FirstOrDefault(p=>p.LanguageCode == this.LanguageCode); //assuming that ProfileLocalizationViewModel has LanguageCode property
       } 
    }
    public List<ProfileLocalizationViewModel> Localizations { get; set; }
}

This code snippet is specific to server-side functionality and does not involve knockout computed properties.

Answer №2

Let's say you have a viewmodel containing Localizations and LanguageCode. You can establish a computed observable in the following manner:

var currentLocalization = ko.computed(function() {
    var code = LanguageCode(); // unwrap observable
    var currentLocalizacion 
      = localizations.find(function(loc) {return loc.langCode === code});;
    return currentLocalization
};

In this scenario, I am utilizing find, which may not be supported in all browsers. For compatibility with browsers lacking this method, consider using a library like lodash (_.find), or utilize an alternative approach such as a for loop to iterate through array elements.

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