Javascript Validation - Webmasters

Javascript Validation - Webmasters - Nairaland

Nairaland Forum › Science/Technology › Webmasters › Javascript Validation (726 Views)

Javascript Validation by akereconfi(op): 2:03am On Nov 18, 2014

Hello, please I need a helping hand on JavaScript validation on checking for numbers in a text field. Have tried w3school but got only validation for email

Thanks for your contribution

Re: Javascript Validation by Craigston: 3:18am On Nov 18, 2014

akereconfi:
Hello, please I need a helping hand on JavaScript validation on checking for numbers in a text field. Have tried w3school but got only validation for email

Thanks for your contribution

Uh, what's your code so far?

Re: Javascript Validation by akereconfi(op): 3:34am On Nov 18, 2014

Craigston:
Uh, what's your code so far?

{
alert("First name must be filled out" wink

;
return false;
}
}
</script>
</head>

<body>
<form name="myForm" action="demo_form.asp" onsubmit="return validateForm()" method="post">
First name: <input type="text" name="fname">
<input type="submit" value="Submit">
</form>
</body>

Re: Javascript Validation by Craigston: 3:57am On Nov 18, 2014

akereconfi:
<script>
function validateForm() {
var x = document.forms["myForm"]["fname"].value;
if (x==null || x=="" {
alert("First name must be filled out";
return false;
}
}
</script>
</head>

<body>
<form name="myForm" action="demo_form.asp" onsubmit="return validateForm()" method="post">
First name: <input type="text" name="fname">
<input type="submit" value="Submit">
</form>
</body>

You said you want to check for number in the string. What would you like to do if a number is found?
You can use 'parseInt()' or 'parseFloat()' here.
if (parseInt(x) != "" wink

{do something};

Re: Javascript Validation by Craigston: 3:58am On Nov 18, 2014

akereconfi:
<script>
function validateForm() {
var x = document.forms["myForm"]["fname"].value;
if (x==null || x=="" {
alert("First name must be filled out";
return false;
}
}
</script>
</head>

<body>
<form name="myForm" action="demo_form.asp" onsubmit="return validateForm()" method="post">
First name: <input type="text" name="fname">
<input type="submit" value="Submit">
</form>
</body>

You said you want to check for number in the string. What would you like to do if a number is found?
You can use 'parseInt()' or 'parseFloat()' here.
if (parseInt(x) != "" ) {do something};

1 Reply

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