knockout js

i have a custom binding defined as below, if i have a value it is working fine but if the value is empty i am getting an exception object is not a function at this line valueAccessor()(thisValue);
if i put a condition to check i it has a value, then the binding is not applied to that field.
ko.bindingHandlers.getter = {
        init: function (element, valueAccessor, allBindingsAccessor, context) {
              
            var $el = $(element),
                thisValue = $el.val() || $el.text();
           valueAccessor()(thisValue);
        }
    }
gvkrAsked:
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ambienceConnect With a Mentor Commented:
Well, this makes sense because when you invoke

valueAccessor()(thisValue);

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you first get the property value using

valueAccessor()

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and then treat it as a function, which becomes

'undefined'(thisValue)

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when the returned value is undefined. You should check the return value of valueAccessor() first.
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