如何在没有按钮的情况下自动保存html textarea？ [关闭]

Question

I have a textarea in my html like this:

<textarea id="area1"></textarea>

When visitors copy/paste or type something in this area i want it to save to a txt file without the visitor having to click any button.

Looked all over the web but can't find any solution.

Answer 1

write JS function, that saves info in .txt file. Let's say, function name is saveToTxt(). Then trigger that function onChange:

<textarea id="area1" onChange="saveToTxt(this);"></textarea>

EDITED

Assume that, saveToTxt() is something like that:

<script>
function saveToTxt(fld) {
    const textAreaValue = fld.value;
    // then use textArea variable as container of textarea-content
    // and then treat it as you want.
}
</script>