Tk text delete invalid index

Scarborough has asked for the wisdom of the Perl Monks concerning the following question:

I have referred to Perl in a Nutshell and found that I should be able to do this

    $text->delete(0, 'end'); #$text being a Text object
[download]

But all I get is a Tk error message saying "0" is a bad index.

Anyone know whats happening here?

80% of success is just turning up - Woody Allen

Comment on Tk text delete invalid index Download Code

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Re: Tk text delete invalid index by Ven'Tatsu (Deacon) on Oct 01, 2004 at 16:13 UTC
Tk::Text boxe indexes start at Line 1, Character 0 or `'1.0'`. I'd guess it's complaining about trying to access the nonexistant line 0.	[reply] [d/l]
Re: Tk text delete invalid index by Grygonos (Chaplain) on Oct 01, 2004 at 16:23 UTC
Aye, I believe it should be `$text->delete('1.0','1.0 end');` [download] if you look up how tk handles these indexes I believe (can't find link..going from memory) that the words such as end and lineend are modifiers of the given index. so `1.0 end` modifies 1.0 to the index at the end..assuming end is a proper index (i have only used linend myself). Grygonos	[reply] [d/l] [select]
Re^2: Tk text delete invalid index by Ven'Tatsu (Deacon) on Oct 01, 2004 at 18:02 UTC
`end` is it's own index, so it can be used alone, `lineend` and friends are modifiers on another index. So you can say `'end linestart'` or `'1.0 lineend'` for the start of the last line or the end of the first line respectively.	[reply] [d/l] [select]