Simulate the event of an input with javascript wa very easy with the series of javascript events is when we want to simulate a form with script and we need to click on the button to send this form or if we want to simulate the event of a select also works
para google chrome
var contenedorselect=document.getElementById('mat-input-1');
var evt = document.createEvent('HTMLEvents');
evt.initEvent('input', false, true);
contenedorselect.dispatchEvent(new Event('input'));
para internet explorer
var contenedorselect=document.getElementById('mat-input-2');
var evt = document.createEvent('HTMLEvents');
evt.initEvent('input', false, true);
contenedorselect.dispatchEvent(evt);
para select
var evt = document.createEvent("HTMLEvents");
evt.initEvent("change", false, true);
contenedorselect.dispatchEvent(evt);
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