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Extjs checkbox and textarea - how to disable the checkbox on scroll behavior of the textarea?

I have a text area that displays some text with a vertical scroll bar on the right and a checkbox below the text area as in the code below:

xtype: 'container',
items: [{
    {
        xtype: 'textarea',
        scrollY: true,
        screenX: true,
        height: 130,
        minHeight: 80,
        top: 10,
        width: 650,
        id: 'testDisplay',
        name: 'testDisplay',
        itemId: 'testDisplay',
        bind: {
            value: some text
        },
        listeners: {
            afterrender: function(cmp) {
                textAreaComp = me.down('#testDisplay');
                textAreaComp.setValue(someInfo);
            }
        },
    }, 
    {
        xtype: 'checkboxfield',
        name: 'testDisplayChkbox',
        id: 'testDisplayChkbox',
        itemId: 'testDisplayChkbox',
        checked: false,
        boxLabel: someLabel,
    }
}]

I am looking to disable the checkbox at first and then enable it after scrolling to the end of the text area located above the checkbox. How can this be achieved?

Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
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