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October 13, 2016 13:52
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Desativar tecla backspace de voltar página do navegador
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// detecta todas as teclas que estão sendo pressionadas | |
$(document).unbind('keydown').bind('keydown', function (event) { | |
// filtra apenas a tecla <backspace> | |
if (event.keyCode === 8) { | |
// variável que decidirá se a tecla será bloqueada | |
var doPrevent = true; | |
// tipos de campos permitidos | |
var types = ["text", "password", "file", "search", "email", "number", "date", "color", "datetime", "datetime-local", "month", "range", "search", "tel", "time", "url", "week"]; | |
var d = $(event.srcElement || event.target); | |
var disabled = d.prop("readonly") || d.prop("disabled"); | |
// checa se está nos campos permitidos e libera o <backspace> para edição | |
if (!disabled) { | |
if (d[0].isContentEditable) { | |
doPrevent = false; | |
} else if (d.is("input")) { | |
var type = d.attr("type"); | |
if (type) { | |
type = type.toLowerCase(); | |
} | |
if (types.indexOf(type) > -1) { | |
doPrevent = false; | |
} | |
} else if (d.is("textarea")) { | |
doPrevent = false; | |
} | |
} | |
// bloqueia a tecla | |
if (doPrevent) { | |
event.preventDefault(); | |
return false; | |
} | |
} | |
}); |
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