How to limit number of characters in INTROTEXT textarea - Joomla! Forum - community, help and support

hi,
i limit characters in introtext textarea, editor.
in php of editor, tried add textaera tag in follow line:

code: select all

<textarea id="$hiddenfield" name="$hiddenfield" cols="$col" rows="$row" style="width:{$width}px; height:{$height}px;" mce_editable="true">$content</textarea>


the follow option:

code: select all

onkeyup="this.value = this.value.slice(0, 20)"

the result is:

code: select all

<textarea onkeyup="this.value = this.value.slice(0, 20)"  id="$hiddenfield" name="$hiddenfield" cols="$col" rows="$row" style="width:{$width}px; height:{$height}px;" mce_editable="true">$content</textarea>

i know put limit in every textarea (not introtext), trying. problem doesn't work.
any ideas?

would work?

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