for creates lazy sequences - this can be a problem if you need side
effects. I suggest using doseq instead.
David
On Mon, Feb 20, 2012 at 11:26 AM, Adrian Mowat <adrian.mo...@gmail.com>wrote:
> Hi Everyone,
>
> I have been coding clojure for a few months and I've just started
> using clojurescript and I am struggling to use for forms inside event
> handlers. Sorry if this is covered elsewhere but I have searched as
> best I can without finding the answers.
>
> I have an event handler that listens for changes in an <input> element
>
> (def search-input (dom/get-element "search"))
> (def test-area (dom/get-element "test-area"))
> (event/listen search-input
> :keyup
> (fn [e]
> (let [search-results ["a" "b"]]
> (dom/append test-area (dom/element :p {} (first search-
> results)))
> (dom/append test-area (dom/element :p {} (second search-
> results))))))
>
> It works fine. Everytime I type in the input box, some text is
> appended to 'test-area'
>
> However, this doesn't work any more when I switch to using for
>
> (event/listen search-input
> :keyup
> (fn [e]
> (let [search-results ["a" "b"]]
> (for [x search-results] (dom/append test-area (dom/element :p {}
> x))))))
>
> Stepping through the generated code, I noticed that the generated
> javascript calls the function with null as the first argument (second
> last line below) but I can't figure out why or how to change the
> behaviour.
>
> clojure.browser.event.listen.call(null,
> smws_numbers.cljs.smws_numbers.search_input, "\ufdd0'keyup",
> function() {
> return function b(c) {
> return new cljs.core.LazySeq(null, !1, function() {
> for(;;) {
> if(cljs.core.truth_(cljs.core.seq.call(null, c))) {
> var d = cljs.core.first.call(null, c);
> return cljs.core.cons.call(null,
> clojure.browser.dom.append.call(null,
> smws_numbers.cljs.smws_numbers.test_area,
> clojure.browser.dom.element.call(null, "\ufdd0'p",
> cljs.core.ObjMap.fromObject([], {}), d)), b.call(null,
> cljs.core.rest.call(null, c)))
> }
> return null
> }
> })
> }.call(null, cljs.core.Vector.fromArray(["a", "b"]))
> });
>
>
> I fell sure I'm missing something fairly basic, but it's escaping me
> for now so any help you can provide would be greatly appreciated.
>
> Many Thanks
>
> Adrian
>
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