If in array knockout js

Question

Is there a way to check if an array contains a certain value, using knockoutJS, within my HTML?

I have the following checkbox:

<td><input type="checkbox" name="group" data-bind="checked: $parent.name in groupList" /></td>

It would be nice if a certain statement inside my data-bind attribute ($parent.name in groupList) would work, but obviously it doesn't. With twig it's easy:

{% if myVar is in_array(array_keys(someOtherArray)) %}

But I cannot find a way to do this with Knockout JS. groupList contains an array with names and I would like to check if it contains a certain name. If it does, the checkbox needs to be checked, else not.

data-bind="checked: groupList().indexOf(ko.unwrap($parent.name)) !== -1" — TSV
– TSV, Commented Sep 13, 2016 at 13:21
@TSV, Nice solution. No need to invoke groupList though. Knockout already provide an indexOf method that is unwrapping the value internally. So, groupList.indexOf(...) will do as well. — haim770
– haim770, Commented Sep 13, 2016 at 13:26

TSV · Accepted Answer · 2016-09-13 15:09:07Z

4

You can use indexOf of an observable array:

data-bind="checked: groupList().indexOf(ko.unwrap($parent.name)) !== -1"

answered Sep 13, 2016 at 15:09

TSV

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