JavaScript Use of knockoutjs disable binding knockout js disabled binding,knockout js disable binding

This one is a super easy fix. Your apply bindings is only hitting the element with id chk1. The value of the observable will only be bound in that scope. Simply remove the second argument of your ko.applyBindings and it will work just fine.

var viewModel = {
        makeInvalid : ko.observable(false),        
};
    
    ko.applyBindings(viewModel);
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>

<input id="input1" type="text" placeholder="Something Here" 
data-bind="disable: makeInvalid"/>
<input type="checkbox" id="chk1" data-bind="checked: makeInvalid"/>
<label>Make Textarea Invalid</label>
Answer:1

You are missing knockout from your jsFiddle.

This is incorrect ko.applyBindings(viewModel, document.getElementById("chk1")); . You need to apply bindings to the input aswell as the checkbox. ko.applyBindings(viewModel);

See working jsFiddle: https://jsfiddle.net/3ag0881z/4/

Answer:2

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