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Hello:
It is very embarrassing and very frustrating to be unable after several days to get what appears to be a simple task to work in practice. Accordingly, I’d be extremely grateful if someone could take the time to demonstrate what must be done coding wise, and perhaps explain a bit what data is available, at what point, and how to access it depending on what the user does.
Hopefully, other inexperienced javascript people will benefit as well.
Assume a page which one is entering the quantity, item, and size of a product. To build it, I set up 1 input form for quantity, 1 drop-down menu for product and one drop-down menu for size.
If the visiter wants to add the item he presses the ADD TO CART button. If he changes his mind he presses the RETURN TO CATALOGUE button.
Validation is–or should be–reasonably simple. On ADD to CART,
1. If size is 0, an ALERT stating size is zero.
2. If size is NON-Numeric. an ALERT stating size is NON-Numeric
3. If No Product selected. an ALERT stating no product Selected.
4. If No size selected. an ALERT stating no size is selected, unless the product is a mousepad.
ON RETURN TO CATALOGUE, no checks are done.
I would have thought the following would do the trick, but nothing happens.
<script type=”text/javascript” language=”Javascript”>
function check_data()
{
quantity=newitem.pquantity.value;
productindex=newitem.pproduct.selectedIndex;
sizeindex=newitem.psize.selectedIndex;
if (quantity == 0){alert (“Missing Quantity, Please Reenter”); }
if (isNaN(quantity))
{alert (“Quantity is Invalid….Please Reenter.”); }
if (productindex < 1) { alert (“No Product Selected. Please Reenter”); }
if ((productindex != 4) && (sizeindex == 0)) //if mousepad, size unnecessary
{ alert (“No Size Selected. Please Reneter”); }
}
</script>
</head>
<body>
<form name=”newitem” action=”addtocrt.php” method=”post” >
Quantity: <input type=”text” maxlength=”2″ size= “2” name=”pquantity” value=”1″ onsubmit=”check_data()”/>
<p>
Product:<select name=”pproduct” onsubmit=”check_data();” >
<option selected value=”0”>Select Product</option>
<option value=’1′>Kid’s Lightweight Tees</option>
<option value=’2′>Kid’s Heavyweight Tees</option>
<option value=’3′>Adult’s Lightweight Tees</option>
<option value=’4′>Mouse Pad</option>
</select>
<p>
Size:<select name=”psize” size=”1″ onsubmit=”check_data();” >
<option selected=”selected”>Select size</option>
<option>S </option>
<option>M </option>
<option>L </option>
<option>XL </option>
<option>XXL </option> </select>
<p>
<input name=”submit” type=”submit” onSubmit=“Data_checks(this);”
value=” ADD TO CART “>
</form>
<form name=”goback” action=”catalogue.php” >
<p> <input name=”catalogue” type=”submit”
value=”RETURN TO CATALOGUE”>
</form>
</body>
</html>