Trigger click on input type file

Hello,

I would like to programmatically trigger the click event on my input field, so that the user automatically sees the "choose file" dialogue.

Any help please how to do this? I tried out some things but couldn't find any solution how to do this. Thank you

Code:

Ext.define('MyApp.view.capturepicture', {
    extend: 'Ext.Component',
    alias: 'widget.capturepicture',

    config: {
        captured: false,
        location: 0,
        cls: 'picture-capture',
        html: '<img style="width: 100%" class="image-tns" />    <input style="width: 100%" type="file" capture="camera" accept="image/*" />',
        id: 'capturepicture'
    },