I have a situation where I am utilizing qTip2 to show validation errors on input fields. In certain scenarios, a group of input fields is hidden using knockout.js 'visible' binding. Despite being hidden, the qTip2 tooltips attached to these input fields are still visible.
Is there a method to enhance the functionality of the 'visible' binding handler so that when elements are about to be hidden, all associated tooltips are also concealed?
To add additional bindings to an element from a custom binding in Knockout, you can utilize the function ko.applyBindingAccessorsToNode for Knockout 3.x or ko.applyBindingsToNode for Knockout 2.x.
For instance, within a custom binding, you could set up the 'visible' binding on an element using the observable passed into the binding in the init method. Then, in the update method, you could call hide on the tooltip when that observable changes to false.
JavaScript
ko.bindingHandlers.qTip = {
init: function(element, valueAccessor) {
$(element).qtip({
content: 'Foo bar',
hide: false,
show: 'click',
position: {
my: 'left bottom',
at: 'right centre'
}
});
ko.applyBindingAccessorsToNode(element, {visible: valueAccessor()});
},
update: function(element, valueAccessor) {
var visible = ko.utils.unwrapObservable(valueAccessor());
if(!visible) {
$(element).qtip('hide');
}
}
};
function ViewModel() {
var self = this;
self.elementVisible = ko.observable(true);
self.toggleVisibility = function () {
self.elementVisible(!self.elementVisible());
};
}
ko.applyBindings(new ViewModel());
HTML
<div data-bind="qTip: elementVisible">Click to show tooltip!!</div>
<button data-bind="click: toggleVisibility">Toggle visibility</button>
If you only want the custom binding to handle visibility and not the qTip setup itself, check out this alternative JSFIDDLE: another JSFIDDLE
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