document.getElementById(txtid) has no properties error

I need to retrieve some notes from a database, allow users to modify
them and then return them to the database.I have done this
satisfactorily using php.However I would like to do it using AJAX.

To this end I have a <div> the innerhtml for which is sent from a php
file. The innerhtml constructs and fills a series of textareas and
provides each with an id.

When I want to return the modified note to the database and try to
copy the text displayed in a text area with the line

var txt=document.getElementById(txtid).value;
or
var txt=document.getElementById(txtid).text;

I get the error
document.getElementById(txtid) has no properties

When I try
var txt=document.getElementById(txtid);
txt gets the null value.

I would be grateful if someone could explain the basis of my error and
how I can get the text string back out of these text areas.

TIA

N
.

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