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Knockout bind 2 links to different views and swich modelview

I'm new to knockout and want to have 2 links on the page with 2 models. I would like the click event on the links switch which view model gets displayed. I've tried a few ways and have a jfiddle https://jsfiddle.net/edgrttj3/7/ but I can't get it to work. Any idea on what I might be doing wrong?

<div id="content">

    <a id="button1" href="#" >View 1</a>&nbsp;
    <a id="button2" href="#" >View 2</a>&nbsp;
    <hr />

    <div data-bind="with: selectedView">
        <div data-bind="template: { name: templateName, data: data }"></div>
    </div>

    <script id="oneTmpl" type="text/html">
        <ul data-bind="foreach: items">
            <li>
                <span data-bind="text: id"></span>
                <input data-bind="value: name" />
            </li>
        </ul>
    </script>

    <script id="twoTmpl" type="text/html">
        First:
        <input data-bind="value: firstName" />
        Last:
        <input data-bind="value: lastName" />
    </script>
</div>

Here is the javascript:

var View = function (title, templateName, data) {
    this.title = title;
    this.templateName = templateName;
    this.data = data;
};

var subModelA = {
    items: ko.observableArray([
        { id: 1, name: "one" },
        { id: 2, name: "two" },
        { id: 3, name: "three" }
    ])
};

var subModelB = {
    firstName: ko.observable("Bob"),
    lastName: ko.observable("Smith")
};


var viewModel = {
    views: ko.observableArray([
        new View("one", "oneTmpl", subModelA),
        new View("two", "twoTmpl", subModelB)
    ]),
    selectedView: ko.observable()
};

function setSelectedView(newview) {
    alert(newview);
    if (newview == "oneTmpl") {
        viewModel.selectedView = viewModel.views[0];
    } else {
        viewModel.selectedView = viewModel.views[1];
    }
};
ko.applyBindings(viewModel);
        document.getElementById ("button1").addEventListener("click", setSelectedView('oneTmpl'), false);
        document.getElementById ("button1").addEventListener("click", setSelectedView('twoTmpl'), false);

about 4 years ago · Santiago Trujillo

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Accepted Answer · 2022-06-13T20:48:18.688Z

Actually your implementation is almost there. There are just couple of tweaks you need to do.

selectedView from the ViewModel is an observable object. An observable object is basically a function. In order to modify the value of that object you need to pass the new value as an argument selectedView(valueIsHere).
views from the ViewModel is an observable array object. The same like above, as an observable object is a function to get its value for a specific index you need to call it like a function first followed with its index views()[0]

So here is how it looks after the update:

var View = function (title, templateName, data) {
  this.title = title;
  this.templateName = templateName;
  this.data = data;
};

var subModelA = {
  items: ko.observableArray([
    { id: 1, name: "one" },
    { id: 2, name: "two" },
    { id: 3, name: "three" }
  ])
};

var subModelB = {
  firstName: ko.observable("Bob"),
  lastName: ko.observable("Smith")
};


var ViewModel =  function (){
  this.views = ko.observableArray([
    new View("one", "oneTmpl", subModelA),
    new View("two", "twoTmpl", subModelB)
  ]);
  this.selectedView = ko.observable();
  this.select = function(id){
    if (id === 1) {
        this.selectedView(this.views()[0]);
    } else {
        this.selectedView(this.views()[1]);
    }
  };
};

ko.applyBindings(new ViewModel());

And here are few changes to the button:

<a id="button1" href="#" data-bind="click: select(1)">View 1</a>&nbsp;
<a id="button2" href="#" data-bind="click: select(2)">View 2</a>&nbsp;

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Knockout bind 2 links to different views and swich modelview

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Andres GPT