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Updating a knockout observable after an async ajax call using ko.mapping.fromJS


Updating a knockout observable after an async ajax call using ko.mapping.fromJS

By : Roberto KIkefox Stef
Date : November 17 2020, 11:58 AM
this will help Two things: 1) You need to create your initial view model with ko.mapping.fromJS, and 2) you need to pass your existing view model as a second parameter to fromJS when updating it.
So something like this instead:
code :
// Activates knockout.js
var avm = ko.mapping.fromJS({firstName: 'Bert'});
ko.applyBindings(avm);

$.ajax({
    dataType: 'json',
    async: true,
    type: 'POST',
    url: '/echo/json/',
    data: {
        json: '{"firstName":"Bob1"}'
    }
}).done(function(data) {
    console.log(data);

    ko.mapping.fromJS(data, avm);

    console.log(avm.firstName());
}).fail(function(jqxhr, textStatus, error) {
    alert('there was an error');
});


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Knockout.js - ko.mapping.fromJS - Visible Binding not updating

Knockout.js - ko.mapping.fromJS - Visible Binding not updating


By : allster
Date : March 29 2020, 07:55 AM
will help you I find that you sometimes need to provide an empty mapping when updating a viewmodel:
code :
ko.mapping.fromJS(model, {}, viewModel);
knockout not updating observable after AJAX call?

knockout not updating observable after AJAX call?


By : Matthew
Date : March 29 2020, 07:55 AM
may help you . I have a standard ajax call that I call from here: , replace
code :
innerModel.cards()[index] = newCard;
innerModel.cards.splice(index, 1, newCard);
Knockout JS: mapping.fromJS stripping out observable attributes of object when added

Knockout JS: mapping.fromJS stripping out observable attributes of object when added


By : Vikas
Date : March 29 2020, 07:55 AM
it should still fix some issue I have the following ko.mapping and an object (coffeescript): , Use
code :
ko.mapping.fromJS [obj], {}, form_fields
knockout mapping (ko.mapping.fromJS()) not updating targets when async $.ajax call

knockout mapping (ko.mapping.fromJS()) not updating targets when async $.ajax call


By : Muhammad Musa KZ Kha
Date : March 29 2020, 07:55 AM
Any of those help I am trying to use ko.mapping to transform data to a viewmodel. The result come from an async call to a web service. , Here is the solution:
I have changed the line:
code :
    self.myData = null;
    self.myData = ko.observable();
    .done(function (d) {
        self.myData(ko.mapping.fromJS(d));
    })
knockout updating the property of observable array's each element using data from an ajax call

knockout updating the property of observable array's each element using data from an ajax call


By : Hilde Bergman
Date : March 29 2020, 07:55 AM
wish helps you I have a ViewModel "AppViewModel" which is getting a JSON data to create the model from, one of the property "totalSessions" is to be fetched using an ajax call, the "model" AppViewModel returns an observable array, My code is running without any errors but the view doesn't seem to update. , You should change:
code :
jsonapparray[j].totalsessions = totalSessions[0];
jsonapparray[i].totalsessions = totalSessions[0];
elem.totalsessions = ko.observable(0);
jsonapparray[i].totalsessions(totalsessions[0]);
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