KnockoutJS and binding a single object to a viewmodel

I've been round and round on this and don't see where things are going wrong. Maybe you can help please.

There are multiple view models setup:

var viewModels = {
    emailTemplateViewModel: {
        subject: new ko.observable('dd'),
        emailName: new ko.observable('dd'),
        emailAddress: new ko.observable('dd'),
        body: new ko.observable('dd')
    deviceSettingsViewModel: {
        managerName: new ko.observable('')    


And I'm trying to populate one of the view models with JSON returned from the server (this is correct and properly formatted).

function LoadEmailTemplate() {
    $.getJSON('/EmailTemplate/Template', function (data) {
        viewModels.emailTemplateViewModel = ko.mapping.fromJS(data);

However when I run this I get the following error: "Uncaught Error: You cannot apply bindings multiple times to the same element."

But all the documentation I read shows the binding occurring after the mapping.

If I take the binding out from the LoadEmailTemplate function out there are no errors at runtime but the page shows the default values 'dd', not those that should have been mapped from the JSON response.

The function is triggered like this:

<li data-bind="click: LoadEmailTemplate"><a href="#"><i class="glyphicon glyphicon-chevron-right pull-right"></i>Email Template</a></li>

I'm trying to use the with-binding as the email template is relative to only a region of the page, e.g.

<div data-bind="with: emailTemplateViewModel">

And the properties:

<input data-bind="value: emailAddress" type="email" class="form-control" id="inputFromEmail">

I know this is working because the form loads with the values set when the viewmodel is first defined. It appears as if it's just the mapping that's misfiring. Any advice would be really appreciated.

Thank you.


Two things, 1 - Do not apply bindings multiple times, even if that works it will cause issues later down the road. 2 - When you get the object from the ajax call do not overwrite your existing object, doing this will break your bindings, instead set your existing object values to the new values.

function LoadEmailTemplate() {
    $.getJSON('/EmailTemplate/Template', function (data) {

Need Your Help

dma_map_single and dma_map_page

intel dma

I want to do dma of multiple frames to send a big frame( jumbo ). I am able to send normal frame ( of size 1500 ). I need some doubts on dma.

Input Button Using Sliding Doors CSS

css forms button input sliding

Designed specifically for input buttons such as &lt;input type="submit" value="Button Name"&gt;, this round button style uses the sliding doors technique that's assembled from a single image.