Hi,
Before answerng your actual question, a quick note on this:
> if (NameEntered.length>3 && [<% for code in @codes %>'<%=
> code.name %>',<% end %>'test'].include(NameEntered)) {
That looks to me as though it will follow all names, including the
last one, with a comma, and so you'll end up with:
if (NameEntered.length>3 && ['first','second','third',].include
(NameEnetered)) {
That will fail on IE (at least) because of the trailing comma; Firefox
and some others will allow it. I'm also assuming that the names don't
include any apostophes or backslashes, as you're not escaping them.
Okay, to the actual question:
In Prototype, Arrays mix in Enumerable, which has the Enumerable#any
[1] method for looking through the enumration for any matching
element. You can specify how the match is defined (probably via a
regular expression[2]). E.g.,:
if (myarray.any(function(item) { return /some expr/i.test(item); }) {
// ...one of the elements matches the regex...
}
(Note I used the 'i' flag on the regex to ignore case.)
That's pretty much it. What follows are just some ideas for making
that clearer/cleaner.
If that looks as ugly to you as it does to me (defining a function on-
the-fly inside an if statement!), a couple of vars plus Function#bind
[3] can help:
var rematch = /some expr/i;
var match = rematch.test.bind(rematch);
if (myarray.any(match) {
// ...one of the elements matches the regex...
}
Better yet, you could even make a factory for these:
function makeRegexMatcher(re)
{
return re.test.bind(re);
}
...then using it is easier:
if (myarray.any(makeRegexMatcher(/some expr/i))
{
// ...
}
(Last one) Or you could have a matching function like this:
function matchesRegex(re, item)
{
return re.test(item);
}
...and use it via Function#curry[4]:
if (myarray.any(matchesRegex.curry(/some expr/i))
{
// ...
}
[1] http://prototypejs.org/api/enumerable/any
[2]
https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/RegExp
[3] http://prototypejs.org/api/function/bind
[4] http://prototypejs.org/api/function/curry
HTH,
--
T.J. Crowder
tj / crowder software / com
Independent Software Engineer, consulting services available
On May 10, 8:16 pm, Katherine <bridgeuto...@gmail.com> wrote:
> Hi everyone. I wonder if there's less strict method for checking
> whether a value exists or is included in an array. What I am looking
> is similar to the SQL "LIKE" which is different from "="
> It would ignore spaces and not caps sensitive.
>
> I have this code
>
> ERB code :
>
> <%= text_field_tag('variation[][name]', variation.short_name, :size =>
> 30, :class => 'textInput', :id=>"varname_#{variation.id}") %>
>
> Prototype :
> new Form.Element.Observer('varname_<%= variation.id %>', 0.3, function
> (form, value){
> var NameEntered = $F('varname_<%= variation.id %>');
>
> if (NameEntered.length>3 && [<% for code in @codes %>'<%=
> code.name %>',<% end %>'test'].include(NameEntered)) {
> $('error-messages-<%= variation.id %>').update('That product name
> exists. ').style.color = 'red'
> }
> else {
> $('error-messages-<%= variation.id %>').update('')
> }
>
> })
>
> I was checking whether the name is included in the array. Is it
> possible to ignore spaces or capitalization so that the validation
> would work better?
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