javascript - Form Validation not working as expected -


i have made cart-mechanism using php , done validation of javascript , validation not working.

this actual php script:

$result = mysqli_query($conn, "select * products"); while($row = mysqli_fetch_array($result)){    $fieldidval[] = $row['product_id'];   $fieldnameval[] = $row['product_name'];   $fieldcostval[] = $row['product_cost'];   $fieldimgval[] = $row['product_image'];   $fielddescval[] = $row['product_description'];  }  //printing field values  for($i = 0; $i < mysqli_num_rows($result); $i++){    echo "<tr><form action = 'cart.php?pid=" . $fieldidval[$i] . "&name=" .$fieldnameval[$i] . "&cost=" . $fieldcostval[$i] . "' method = 'post' name = 'tocart' onsubmit = 'return(validateall());'><td>" . $fieldnameval[$i] . "</td><td>" . $fieldcostval[$i] . "</td><td>" . $fieldimgval[$i] . "</td><td>" . $fielddescval[$i] . "</td><td><input type = 'text' name ='qty_input[$i]' ></td><td><input type = 'submit' name = 'submit'></td></form></tr>"; }

and validation in javascript:

function validateall(){   if( document.tocart.qty_input[0].value == "" ){     alert("please enter valid number");     document.tocart.qty_input.focus();     return false;   }

when hit submit nothing works.

converting comment answer

if keep inline submit handler, pass form using this

onsubmit = 'return validateall(this);'

then can access form directly in handler without having use longer document.formname

function validateall(form) { // "this" -> whatever in (....) here   var qty_input= form["qty_input[0]"];    if (qty_input.value == "") {      alert("please enter valid number");       qty_input.focus();       return false;    } }

here better way using unobtrusive code

window.onload=function() { // when page loads. can use event listener   document.queryselector("[name=tocart]").onsubmit=function() {     var qty_inputs = document.queryselectorall("[name^=qty_input]"); // starts     (var i=0;i<qty_inputs.length;i++) {        if (qty_inputs[i].value == "") {           alert("please enter valid number");           qty_inputs[i].focus();           return false;        }     }   } }

and can avoided using 

<input type = 'text' name ='qty_input[$i]' required />

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