Accessing Input Type Image Coordinate Params

Rails
1

Form input of type image sends as parameters the x,y coordinates of
the point on the image where the click occurred. Param keys are
generally in the form, ‘my_image.x’ and ‘my_image.y’. So, if one
wants to test whether a particular image coordinate key is present he
would typically use something like:

params.has_key?(:my_image.x)

This results in a complaint that the ‘x’ method is not defined.
Presumably the problem is with the ‘.’ in the symbol name. Enclosing
the key name in single quotes works; but, I think that has been
deprecated. I’m wondering what is the best way of handling this.

Thanks for any input.

    ... doug
2

Doug J. wrote:

Form input of type image sends as parameters the x,y coordinates of
the point on the image where the click occurred. Param keys are
generally in the form, ‘my_image.x’ and ‘my_image.y’. So, if one
wants to test whether a particular image coordinate key is present he
would typically use something like:

params.has_key?(:my_image.x)

This results in a complaint that the ‘x’ method is not defined.
Presumably the problem is with the ‘.’ in the symbol name. Enclosing
the key name in single quotes works; but, I think that has been
deprecated.

But you are wrong AFAIK. params is a HashWithIndifferentAccess, so you
can use either symbols or strings.

I’m wondering what is the best way of handling this.

If you want to use a symbol, then review your basic Ruby syntax for
symbol literals. I recently dealt with this same issue in the post at
XML parsing, block name with minus - Rails - Ruby-Forum , so I’ll just refer you
there instead of typing the whole thing out again. Let me know if you
have any questions.

Thanks for any input.

    ... doug

Best,

Marnen Laibow-Koser
http://www.marnen.org
[email protected]

3

But you are wrong AFAIK. params is a HashWithIndifferentAccess, so you
can use either symbols or strings.

That settles the issue. Thanks.

     ...doug