Knockoutjs Recurring Array

I am creating a treeview styled object using KnockoutJS and need to be able to have x number of children folders and items. Has anyone done a recurring array on screen, I usually use foreach and I can put one child within another but I can’t figure out how to change the template to make them recurring, is it even possible? To clarify I can get the items into knockout fine it’s simply getting them displayed on screen.

Looked everywhere on the internet but can only find nested templates rather than recurring ones. Can anyone help?

Here is Solutions:

We have many solutions to this problem, But we recommend you to use the first solution because it is tested & true solution that will 100% work for you.

Solution 1

Let me demonstrate how you can achieve this using a template.
Let suppose you have the following viewmodel:

var comments = [{
    id: 1,
    comment: 'How can i use knockoutjs?',
    childrenLength: 3,
    children: [{
        id: 2,
        comment: 'Please search before asking',
        childrenLength: 0,
        children: []
    }, {
        id: 3,
        comment: 'Please read the documentation',
        childrenLength: 0,
        children: []
    }, {
        id: 4,
        comment: 'You can see the blog posts on this',
        childrenLength: 2,
        children: [{
            id: 5,
            comment: 'Please search before asking',
            childrenLength: 0,
            children: []
        }, {
            id: 6,
            comment: 'Please search before asking',
            childrenLength: 0,
            children: []
        }]
    }]
}, {
    id: 7,
    comment: 'You question is not sufficient to be asked here?',
    childrenLength: 3,
    children: [{
        id: 8,
        comment: 'Please seach before asking',
        childrenLength: 0,
        children: []
    }, {
        id: 9,
        comment: 'Please read the documentation',
        childrenLength: 0,
        children: []
    }, {
        id: 10,
        comment: 'You can see the blog posts on this',
        childrenLength: 0,
        children: []
    }]
}]

var vm = function(){
    var self = this
    self.comments = ko.observableArray(comments)
}

$('document').ready(function () {
    ko.applyBindings(new vm())
})

You can see here is multilevel branching. Now you can achieve this with recursion.

<div class="body" data-bind="foreach: comments">
    <div data-bind="template: { name: 'childTemplate', data: $data }"></div>
</div>

<script type="text/html" id="childTemplate">
    <span data-bind="text:comment"></span>
    <!-- ko if: $data.childrenLength > 0 -->
        <!-- ko foreach: children -->
            <div data-bind="template: { name: 'childTemplate', data: $data }" style="padding-left:35px;"></div>
        <!-- /ko -->
    <!-- /ko -->
</script>

Fiddle Demo

Note: Use and implement solution 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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