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Twitterboolean-to-inList
A converter that binds a boolean attribute, such as an <input> value, to whether or not an item is in a list.
boolean-to-inList(item, list)
When the getter is called, returns true if item is within the list, determined using .indexOf.
When the setter is called, if the new value is truthy then the item will be added to the list using .push; if it is falsey the item will removed from the list using .splice.
<input type="checkbox" checked:bind="boolean-to-inList(item, list)" />
Parameters
- item
{*}:The item to which to check
- list
{can-define/list/list|can-list|Array}:The list
Returns
{can-compute}:
A compute that will be used by can-stache-bindings as a getter/setter when the element’s value changes.
Use
Use this converter when two-way binding to an element with a boolean attribute, such as a checkbox.
var map = new DefineMap({
item: 5,
list: [1, 2, 3, 4, 5]
});
var template = stache('<input type="checkbox" checked:bind="boolean-to-inList(item, list)" />');
document.body.appendChild(template(map));
var input = document.querySelector('input[type=checkbox]');
console.log(input.checked); // -> true
map.item = 6;
console.log(input.checked); // -> false
map.list.push(6);
console.log(input.checked); // -> true