I created a small table where users can input product names and numbers. My question is, how can I notify the user if they try to leave the page without saving the entered information?
<form action="index.php" method="post">
<input type="text" name="pnumber" value="" placeholder="Product Number...."/>
<input type="text" name="pname" placeholder="Product Name...." /> <br>
<button id="save">save</button>
</form>
Contemporary web browsers have integrated the window.onbeforeunload event that can be utilized to implement such features.
To start off, you can verify if the fields are empty.
$(window).unload(function() {
var phoneNumber = $("input[name=phoneNumber]").val();
var personName = $("input[name=personName]").val();
if(phoneNumber === "" || personName === "") {
alert("Please complete the form");
return false;
}
});
Another method is to use a global flag for checking.
var isSaved = false; // global variable
$("#save").click(function() {
isSaved = true;
});
$(window).unload(function() {
if(isSaved === false) {
alert("Please complete the form");
return false;
}
});
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