Guide to executing code once Knockout JS has completed updating the DOM

Question

Guide to executing code once Knockout JS has completed updating the DOM

Within my view, I have the following code snippet:

<ul data-bind="foreach: caseStudies">
    <li><a data-bind="text: title, attr: { href: caseStudyUrl }"></a></li>
</ul>

I am looking to execute some 3rd Party script after knockout has updated the DOM.

caseStudies(data);
thirdPartyFuncToDoStuffToCaseStudyLinks(); <-- DOM not yet updated.

Is there a way to tap into knockout's functionality in order to trigger this at the right moment?

javascript knockout.js

Answer 1

Answer №1

Utilizing the afterRender binding can be beneficial for you.

<ul data-bind="foreach: { data:caseStudies, afterRender:executeThirdPartyTask }">
    <li><a data-bind="text: title, attr: { href: caseStudyUrl }"></a></li>
</ul>


function executeThirdPartyTask(element, caseStudy) {
    if(caseStudies.indexOf(caseStudy) == caseStudies().length - 1){
        performThirdPartyActionOnCaseStudyLinks();
    }
}

Answer 2

Utilizing the afterRender binding can be beneficial for you.

<ul data-bind="foreach: { data:caseStudies, afterRender:executeThirdPartyTask }">
    <li><a data-bind="text: title, attr: { href: caseStudyUrl }"></a></li>
</ul>


function executeThirdPartyTask(element, caseStudy) {
    if(caseStudies.indexOf(caseStudy) == caseStudies().length - 1){
        performThirdPartyActionOnCaseStudyLinks();
    }
}

Answer 3

Answer №2

To take advantage of KnockoutJS's sequential binding application, you can utilize a virtual element after the 'foreach-bound' element. By defining a 'text' binding that invokes your third-party function, you can achieve the desired result.

Consider this HTML example:

<ul data-bind="foreach: items">
    <li data-bind="text: text"></li>
</ul>
<!-- ko text: ThirdParyFunction () -->
<!-- /ko -->

Take a look at the corresponding JavaScript code snippet:

    $(function () {
        var data = [{ id: 1, text: 'one' }, { id: 2, text: 'two' }, { id: 3, text: 'three' } ];

        function ViewModel(data) {
            var self = this;
            this.items = ko.observableArray(data);
        }

        vm = new ViewModel(data);
        ko.applyBindings(vm);
    });

    function ThirdParyFunction() {
        console.log('third party function gets called');
        console.log($('li').length);
    }

Answer 4

To take advantage of KnockoutJS's sequential binding application, you can utilize a virtual element after the 'foreach-bound' element. By defining a 'text' binding that invokes your third-party function, you can achieve the desired result.

Consider this HTML example:

<ul data-bind="foreach: items">
    <li data-bind="text: text"></li>
</ul>
<!-- ko text: ThirdParyFunction () -->
<!-- /ko -->

Take a look at the corresponding JavaScript code snippet:

    $(function () {
        var data = [{ id: 1, text: 'one' }, { id: 2, text: 'two' }, { id: 3, text: 'three' } ];

        function ViewModel(data) {
            var self = this;
            this.items = ko.observableArray(data);
        }

        vm = new ViewModel(data);
        ko.applyBindings(vm);
    });

    function ThirdParyFunction() {
        console.log('third party function gets called');
        console.log($('li').length);
    }

Guide to executing code once Knockout JS has completed updating the DOM

Answer №1

Answer №2

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