Here is how to edit text in a web page textArea component programatically by JavaScript function. Put it in page <head>:
<script language="javascript" type="text/javascript"> function addtext() { var newtext = "Text to display"; document.myform.outputtext.value = newtext; } </script>
Then call this method after button click:
onclick="addtext() "
as this function is quite simple, it is more efficient to call it inline, without declaring it in <head>:
onclick="document.myform.outputtext.value = 'Text to display';"
If you need to append text to already existing text, just use += operator:
onclick="document.myform.outputtext.value += 'Text to display';"
Here you will find more detailed examples on issue described. Also please consider where do you put your JavaScript functions. Here are some advices on it. Follow them to mak your page load faster.
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Looks OK! 