exploring lift javascript example

[I D]

I was attempting to implement the simple form validation javascript
example from Exploring Lift and ran into an error.

I have posted below the working bind that I commented out and the
error causing bind that was my failed attempt at implementing the
validation javascript.

bind("test", xhtml,
"blog_title" -> SHtml.text(blog_title, blog_title = _, "id" -
> "blogtitle"),
"submit" -> SHtml.submit("Post", newBlog, "onclick" ->
JsIf(JsEq(ValById("blogtitle"), ""),
Alert("You must provide a value") & JsReturn(false))))

/*
bind("test", xhtml,
"blog_title" -> SHtml.text(blog_title, blog_title = _),
"submit" -> SHtml.submit("Post", newBlog))
*/

I received a "type mismatch" error that stated
[INFO] found : (String, net.liftweb.http.js.JsCmd)
[INFO] required: net.liftweb.http.SHtml.ElemAttr
[INFO] "submit" -> SHtml.submit("Post", newBlog, "onclick" ->
JsIf(JsEq(ValById("blogtitle"), ""),

I understand that the third parameter is suppose to be an ElemAttr but
I was just following the example and don;t really know where to go
next since I am just starting..

http://exploring.liftweb.net/master/index-10.html#toc-Section-10.1







I have been playing around with Scala/Lift for around a month and have
made some assumptions that I would like to confirm.

[Derek Chen-Becker]

I don't have time to dig through the docs/code, but what I think you might be getting an implicit conversion here that's making the "onclick" into something that has a "->" method. Maybe. Could you try changing it to

SHtml.submit("Post", newBlog, ("onclick", ...your JS here...))

Using (A,B) for Pair instead of A -> B might avoid it. Please let me know if this works.

Derek

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[I D]

Thanks. I received the same error. I should have also stated that I am
using scala 2.8.1 and lift 2.3.

On Jul 18, 12:24 pm, Derek Chen-Becker <dchenbec...@gmail.com> wrote:
> I don't have time to dig through the docs/code, but what I think you might
> be getting an implicit conversion here that's making the "onclick" into
> something that has a "->" method. Maybe. Could you try changing it to
>
> SHtml.submit("Post", newBlog, ("onclick", ...your JS here...))
>
> Using (A,B) for Pair instead of A -> B might avoid it. Please let me know if
> this works.
>
> Derek
>

[Antonio Salazar Cardozo]

I think it's the opposite; you're missing an implicit conversion.

Try importing SHtml._. If that doesn't work, try doing:

"onclick" -> 
  (JsIf(JsEq(ValById("blogtitle"), ""), 
      Alert("You must provide a value") & JsReturn(false))).toJsCmd

And see if that makes things work.

Thanks,

Antonio

[I D]

your second suggestion worked. thanks!

On Jul 19, 8:55 am, Antonio Salazar Cardozo <savedfastc...@gmail.com>
wrote:

[Antonio Salazar Cardozo]

Awesome. Yeah, you needed to trigger the implicit (String, String) to ElemAttr conversion, but I guess it wasn't catching a JsCmd->String implicit or perhaps there simply isn't one. toJsCmd will convert the JsCmd to a String, thus making the overall expression a (String, String), which then gets converted to an ElemAttr for you :)

Thanks,

Antonio