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Editorial Team
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Asked: 2026-05-25T15:04:00+00:00

in the below code , the alert box is appearing in another window when

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in the below code , the alert box is appearing in another window when values are not entered in the fields. but i want the alert box to appear in the same window of html page( detail.htm).how can i do this?

detail.htm:

<body>    
    <h1> Product: </h1>
    <form  action="product.php"  method="post"  >
        <input type="text" name= "product_id" size="15" />
        <input type="text" name= "price" size="10"/>
        <input type = "submit"  value = "enter" /> 
    </form>        
</body>

product.php:

if (empty($_POST["product_id"]) || empty($_POST["price"])) {
    echo "<script>alert('You must enter both values.')</script>";
} else {
    include 'product.htm';
}
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1 Answer

  1. Editorial Team

    I think you should use client side validation:

    <script language="javascript">
    function validate() {
        if (document.forms[0].product_id.value == "") {
            window.alert("You must enter both values");
            return false;
        }
        if (document.forms[0].price.value == "") {
            window.alert("You must enter both values");
            return false;
        }
    }
</script>

    And then call the validate() function on onsubmit event of FORM like

    <form action="product.php"  method="post" onsubmit="return validate();">
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