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Empty check checkValidity null protection
Useful when used against contenteditable divs to avoid exceptions
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@ -111,7 +111,7 @@
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})
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.on("keyup change", ".form-control", function() {
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var $this = $(this);
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if($this.val() === "" && $this[0].checkValidity()) {
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if ($this.val() === "" && (typeof $this[0].checkValidity != "undefined" && $this[0].checkValidity())) {
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$this.addClass("empty");
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} else {
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$this.removeClass("empty");
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