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Throttles updating of the character counter to reduce the performance impact on typing, especially on slower devices (mobiles, netbooks).

Browse Source 
http://laconi.ca/trac/ticket/1462
This commit is contained in:
brion 2009-08-08 17:54:57 -07:00 committed by Craig Andrews
parent fe3ce5b6c4
commit c6d2e54a71
1 changed files with 28 additions and 8 deletions
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36
js/util.js
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@ -17,21 +17,41 @@
*/
$(document).ready(function(){
var counterBlackout = false;
// count character on keyup
function counter(event){
var maxLength = 140;
var currentLength = $("#notice_data-text").val().length;
var remaining = maxLength - currentLength;
var counter = $("#notice_text-count");
if (counter.text() != String(remaining)) {
counter.text(remaining);
}
if (remaining.toString() != counter.text()) {
if (!counterBlackout || remaining == 0) {
if (counter.text() != String(remaining)) {
counter.text(remaining);
}
if (remaining < 0) {
$("#form_notice").addClass("warning");
} else {
$("#form_notice").removeClass("warning");
}
if (remaining < 0) {
$("#form_notice").addClass("warning");
} else {
$("#form_notice").removeClass("warning");
}
// Skip updates for the next 500ms.
// On slower hardware, updating on every keypress is unpleasant.
if (!counterBlackout) {
counterBlackout = true;
window.setTimeout(clearCounterBlackout, 500);
}
}
}
}
function clearCounterBlackout() {
// Allow keyup events to poke the counter again
counterBlackout = false;
// Check if the string changed since we last looked
counter(null);
}
function submitonreturn(event) {