Trigger a callback in KnockoutJS once all bindings have been successfully set up

Question

Trigger a callback in KnockoutJS once all bindings have been successfully set up

I am facing a frustrating bug that is detailed here: <select> only shows first char of selected option and I am looking for a solution to remove the display:none from my select boxes in order to resolve this issue. Any ideas?

Here's the binding:

<select data-bind="options: Values, optionsText: 'DisplayNameWithCost', optionsCaption: ControlCaption, selectedOptions: SelectedValues, event: { change: $root.resolveAllAttributeUi }, disable: IsDisabled"></select>

EDIT: I have discovered that the problem lies with selectedOptions: SelectedValues being empty and causing it not to select anything in IE9.. I am unsure about how to fix this. Here's an example you can try in IE9 http://jsfiddle.net/9CaTa/

javascript internet-explorer knockout.js internet-explorer-9

Answer 1

Answer №1

selectedOptions should only be utilized with multi-select lists. For more information, refer to .

If you're looking for a different approach, consider using the value binding instead: http://jsfiddle.net/mbest/9CaTa/2/

Update:

selectedOptions may not function optimally with optionsCaption. To ensure it selects the first item by default, create a custom binding that envelops selectedOptions:

ko.bindingHandlers.mySelectedOptions = ko.utils.extend({}, ko.bindingHandlers.selectedOptions);
ko.bindingHandlers.mySelectedOptions.update = function(element) {
    ko.bindingHandlers.selectedOptions.update.apply(this, arguments);
    if (element.selectedIndex === -1)
        element.selectedIndex = 0;
}

To see this in action, check out your example using this new binding: http://jsfiddle.net/mbest/9CaTa/3/

I've observed that selecting the caption may leave an undefined item in the selected array. If this is unwanted behavior, modify your custom update function to handle this and clear the array as needed: http://jsfiddle.net/mbest/9CaTa/4/

Answer 2

selectedOptions should only be utilized with multi-select lists. For more information, refer to .

If you're looking for a different approach, consider using the value binding instead: http://jsfiddle.net/mbest/9CaTa/2/

Update:

selectedOptions may not function optimally with optionsCaption. To ensure it selects the first item by default, create a custom binding that envelops selectedOptions:

ko.bindingHandlers.mySelectedOptions = ko.utils.extend({}, ko.bindingHandlers.selectedOptions);
ko.bindingHandlers.mySelectedOptions.update = function(element) {
    ko.bindingHandlers.selectedOptions.update.apply(this, arguments);
    if (element.selectedIndex === -1)
        element.selectedIndex = 0;
}

To see this in action, check out your example using this new binding: http://jsfiddle.net/mbest/9CaTa/3/

I've observed that selecting the caption may leave an undefined item in the selected array. If this is unwanted behavior, modify your custom update function to handle this and clear the array as needed: http://jsfiddle.net/mbest/9CaTa/4/

Trigger a callback in KnockoutJS once all bindings have been successfully set up

Answer №1

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