Invoke index functions within a component

I have a widget/component written in Angular 4 within the index.html file. Before and after this angular app, there are various HTML elements due to the nature of it being an additional component for the website.

The head section of the index file includes loading CSS and JS libraries like jQuery and Bootstrap.

To style select and option tags, I am utilizing the bootstrap-select.

The problem arises with select boxes that are hardcoded in the index file—they work perfectly fine. However, select boxes inside the Angular app only function properly initially.

When using the *ngIf directive to hide and show elements, if they are added back again, the two functions in the index file do not get called.

index.html

<script>
    $(document).ready(function(){
        if ($('.select_box').length > 0){initializeSelectPicker();}
    });

    $(window).load(function(){
        if ($('.select_box').length > 0){adjustSelectPicker();}
    });

    $(window).resize(function(){
        if ($('.select_box').length > 0){adjustSelectPicker();}
    });

    function initializeSelectPicker(){
        $('.select_box').selectpicker({});
    }

    function adjustSelectPicker(){

        $(this).find(".btn-group.bootstrap-select.select_box.show-tick .btn.dropdown-toggle.selectpicker.btn-default .filter-option.pull-left").css("width", "0");

        $(this).each(function(){
            var maxWidthBox = $(this).find(".btn-group.bootstrap-select.select_box.show-tick .btn.dropdown-toggle.selectpicker.btn-default").width() - 20;
            $(this).find(".btn-group.bootstrap-select.select_box.show-tick .btn.dropdown-toggle.selectpicker.btn-default .filter-option.pull-left").css("width", maxWidthBox + "px");
        });
    }
</script>

Is there any way to call them in the ngOnChanges of a component?

Answer №1

Although not the recommended approach, one way to solve this issue is by emitting an event and listening for a specific event name in your index file.

Index file:

window.addEventListener('ngFix', function(e) {
// call one of the methods you want to execute.
});

Somewhere in your component, you will need to emit the event when the input value for the if directive changes.

window.dispatchEvent(new CustomEvent('ngFix'));

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