What is the best way to trigger the afterRender handler function within a nested foreach loop?

One of the challenges I encountered was using a foreach statement along with afterRender to trigger a specific function.

<div data-bind="foreach: { data: Object.keys(pricings()), as: '_propkey', afterRender: pricingTableRenderedHandler }">

Initially, _propkey was just a single string in each iteration. However, I later had to modify the foreach statement to this:

<div data-bind="foreach: { data:  pricings(), as: '_propertykey', afterRender: pricingTableRenderedHandler}">
    <div data-bind="foreach: { data: _propertykey.states, as: '_secondarypropkey'}">

The handler function looked like this:

self.pricingTableRenderedHandler = function (data, stateName) {
        var tableSelector = "#" + stateName.states.state.replace(/\s/g, '');

        hideEmptyTableColumns.hide(tableSelector);
        replaceEmptyTableCells.replaceBy(self.emptyCellValue, tableSelector);
}

With the old foreach setup, the stateName parameter would receive a string value. After the update, it began receiving an object structure like this:

[
"cropYear" : "2020",
"states": [
    {
        "state": "Tbilisi",
        "details": {
            "PriceHeaders": [],
            "Comment": "TBi",
            "Pricings": []
        }
    },
    {
        "state": "Texas",
        "details": {
            "PriceHeaders": [],
            "Comment": "dasdsa",
            "Pricings": []
        }
    }
]

I realized that I only needed the value of the "state" property. Despite attempting to call the handler function within the inner foreach loop, it did not execute properly unless specified within the initial foreach statement.

Answer №1

When utilizing the foreach binding, a new binding context is created for each element. If you find the need to access a property of the original context within the template passed to foreach, you can do so by using $parent.

<div data-bind="foreach: { 
                  data:  pricings(),
                  as: '_propertykey'
                }">
  <div data-bind="foreach: {
                    data: _propertykey.states,
                    as: '_secondarypropkey'},
                    afterRender: $parent.pricingTableRenderedHandler">
    <!--                         ^^^^^^^^                          -->
  </div>
</div>

It's important to note that the function will be invoked with the current element ($data) set as this. If your handler relies on this, you can make use of $parent.methodName.bind($parent).

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