jQuery trigger select change value in data binding in site using Knockout.js - possible?

User 4561667

I need to activate select values ​​in a website using Knockout.js using a browser extension.

I'm using jQuery and I'm a little lost on the trigger ko method.

Here is the select where I want to change the value:

<select name="subDuration" class="select number_weeks" id="sub_duration"
data-bind="
    options: options.durationOptions, 
    optionsText: 'val', 
    optionsValue: 'key', 
    optionsCaption: 'Select subscription duration', 
    value:options.duration,
    event:{
        change: options.updateDuration,
        blur: options.validateDuration
    },
    attr:{
        'aria-invalid': options.hasDurationError,
        'aria-describedby': options.hasDurationError() ? 'sub_duration_error' : false
    }
" 
data-ctp-cont="Direct Debit Payments">
</select>

$("#sub_duration").focus().trigger("change", options).val(2).blur()

When I use the cde line above, it sets the value to 2, but the site validation runs on blur and doesn't recognize it as valid. If I choose something else and then choose 2 again it will. It feels like jQuery changes are not being triggered in the site ko js validation.

Any idea what I'm missing here? Sadly, I've never used knockout.js...

Any help is appreciated. Thanks!

User 4561667

Thanks to @user3297291, I followed the solution to inject js in the main site to be able to run code from my extension's content script.

Here's the solution code in my extended content script in case anyone has the same problem:

function myFunc() {
  //Trigger some Knockout JS functions on the main site scope.
}

var script = document.createElement('script');
script.appendChild(document.createTextNode('('+ myFunc +')();'));
(document.body || document.head || document.documentElement).appendChild(script);

Thanks to anyone who has helped!

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