sharepoint 2010 - Why does this jQuery not only not work, but break all the other jQuery? -

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i doing "fancy" hiding (slideup , slidedown) of elements on sharepoint webpart.

i added handler, though, button:

$(document).on("click", '[id$=btnaddfoapalrow]', function (e) {     alert('you mashed foapal button');     if ($('[id$=foapalrow3]').css('display') == 'none') {         $('[id$=foapalrow3]').slidedown();     }     else if ($(['id$ = foapalrow4]').css('display') == 'none') {         $('[id$=foapalrow4]').slidedown();     } });

...but not fails work (the htmltablerows not display when button clicked), other jquery (checkbox change event handlers, etc.) fail work after adding code. commenting out, , old code work still.

why code obliterate whole shebang?

$(['id$ = foapalrow4]') <- seems there typo here

it should be

$('[id$ = foapalrow4]')

your code after edit:

$(document).on("click", '[id$=btnaddfoapalrow]', function (e) {     alert('you mashed foapal button');     if ($('[id$=foapalrow3]').css('display') == 'none') {         $('[id$=foapalrow3]').slidedown();     } else if ($('[id$ = foapalrow4]').css('display') == 'none') {         $('[id$=foapalrow4]').slidedown();     } });

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