check if input is empty css
/* If input is not empty */
input:not(:placeholder-shown) {
/* You need to add a placeholder to your fields. For example: <input "placeholder=" "/> */
border-color: green;
}
/* If input is empty */
input:placeholder-shown {
border-color: red;
}javascript check if input is empty
<!-- check if any input field in "Form" is empty using JS -->
<script type="text/javascript">
function validateForm() {
var a = document.forms["Form"]["answer_a"].value;
var b = document.forms["Form"]["answer_b"].value;
if (!a || !b) {
alert("Please Fill All Required Fields");
return false;
}
}
</script>
<form method="post" name="Form" onsubmit="return validateForm()" action="">
<input type="text" name="answer_a" value="">
<input type="password" name="answer_b" value="password">
</form>Copyright © 2021 Codeinu
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