variables - jQuery - Is it okay to use $('#ElementId') everytime? -


i learned how 'document.getelementbyid' counterpart in jquery (and it's more powerful). question is, okay use everytime or every line of code? here's how use now:

$('#myparentelement').html('<tr id="' + $('#myelement').val() + '"><td>' + $('#myelement').val() + '</td></tr>';

isn't better if using variable reference object?

var x = $('#myelement'); $('#myparentelement').html('<tr id="' + x.text() + '"><td>' + x.text() + '</td></tr>';

note i'm more concern of performance, not cleanliness of codes.

dom selection expensive. cache it.

var x = $('#myelement');

here's jsperf test. in chrome 13 on mac os x, variable reference on 1,000 times faster.

this not due dom selection of course, construction of jquery object.


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