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I am trying to create a custom error message when a number which is too high or low is entered in the "size" element. However, I am unable to make this work. I am a beginner so a solution which involves the least changes to my existing code would be most appreciated.
function autoFillcost() {
var size = document.getElementById("size").value;
if (size <= 25)
document.getElementById("cost").value = "£100";
else if (size >= 26 && size <= 50)
document.getElementById("cost").value = "£200";
else
document.getElementById("cost").value = "£300";
}
function sizeValidate() {
var size = document.getElementById("size");
if (!size.checkValidity()) {
size.setCustomValidity("ERROR!");
} else {
size.setCustomValidity("");
}
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<body>
<form>
Group Size:<input type="number" min="6" max="200" id="size" onblur="autoFillcost();sizeValidate();" required>
<p>Cost:<input type="text" id="cost"></p>
<p id="demo"></p>
</form>
</body>
</html>
615
setCustomValidity() The HTMLSelectElement. setCustomValidity() method sets the custom validity message for the selection element to the specified message. Use the empty string to indicate that the element does not have a custom validity error.
By using setting the custom validity to an empty string we are removing the error message and with reportValidity() the input is updated and removes the validation error. With the above code, we can see the error message is removed as soon as the user enters a value in the input.
The problem with setCustomValidity is, that it does only work once you submit the form.
function autoFillcost() {
var size = document.getElementById("size").value;
if (size <= 25)
document.getElementById("cost").value = "£100";
else if (size >= 26 && size <= 50)
document.getElementById("cost").value = "£200";
else
document.getElementById("cost").value = "£300";
}
function sizeValidate() {
var size = document.getElementById("size");
if (!size.checkValidity()) {
size.setCustomValidity("ERROR!");
} else {
size.setCustomValidity("");
}
}button {
padding:6px;
cursor:pointer;
}
input {
padding:5px;
border:1px solid #aaa;
box-shadow: 0px 0px 3px #ccc, 0 10px 15px #eee inset;
border-radius:2px;
}
input:valid {
background-color: white;
}
input:invalid {
background-color: lightpink;
}<form>
Group Size:<input type="number" min="6" max="200" id="size" onblur="autoFillcost();sizeValidate();" required />
<p>Cost:<input type="text" id="cost"></p>
<p id="demo"></p>
<button type="submit">Submit</button>
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