Hi请找到以下代码并帮助解决问题
<html>
<body>
<script
src="https://code.jquery.com/jquery-3.6.0.js"
integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk="
crossorigin="anonymous"></script>
<script>
function fnAlertTitle(){
var strTitleFlag =document.test.fname.value.trim();
console.log("strTitleFlag::"+strTitleFlag);
if (strTitleFlag == "") {
alert("Please Select Fname");
document.test.fname.focus();
window.event.returnValue =false;
return;
}
}
$('body').on('keydown', 'input, select', function(e) {
if (e.key === "Enter") {
var self = $(this), form = self.parents('form:eq(0)'), focusable, next;
focusable = form.find('input,a,select,button,textarea').filter(':visible');
next = focusable.eq(focusable.index(this)+1);
if (next.length) {
next.focus();
} else {
form.submit();
}
return false;
}
});
</script>
<h1>The input element</h1>
<form name="test" action="">
<label for="fname">First name:</label>
<input type="text" id="fname" name="fname" tabindex="1"><br><br>
<label for="lname">Last name:</label>
<input type="text" id="lname" name="lname" tabindex="2" onFocus="javascript:fnAlertTitle();"><br><br>
<input type="submit" value="Submit">
</form>
</body>
</html>
按下选项卡ONFOCUS事件调用一次，但在多次按下时输入其调用，请帮助解决问题
您可以删除onFocus="javascript:fnAlertTitle((">，并对您的代码进行较小的更改，如下所示：
function fnAlertTitle(){
...
if (strTitleFlag == "") {
...
return true;
}
}
$('body').on('keydown', 'input, select', function(e) {
if (e.key === "Enter") {
if(fnAlertTitle()) return;
var self = ...
}
});