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I've this code:
<html>
<head>
<script type="text/javascript">
function validate(){
var name=document.frm.name.value;
if(name.indexOf("A")==0){
alert(name);
}
}
</script>
</head>
<body>
<form name="frm" action="test.php">
Enter name:<input type="text" name="name" onblur="validate()"/>
Enter e-Mail:<input type="text" name="email" onblur=""/>
<input type="submit"/>
</form>
</body>
</html>
In above code, I'd tried to validate textfields when they lose focus. The script working fine if the name starts with A. But I want if the user enter different name which doesn't start with A it will return the focus to the textfield name. For that I'd written this script:
<script type="text/javascript">
var name = document.frm.name.value;
if(name.indexOf("A") == 0){
alert(name);
}else{
document.frm.name.focus();
}
</script>
then it doesn't works.
Anybody could help with that what should I do to request focus of textfield name?
I've only a little knowledge of javascript.
I've this code:
<html>
<head>
<script type="text/javascript">
function validate(){
var name=document.frm.name.value;
if(name.indexOf("A")==0){
alert(name);
}
}
</script>
</head>
<body>
<form name="frm" action="test.php">
Enter name:<input type="text" name="name" onblur="validate()"/>
Enter e-Mail:<input type="text" name="email" onblur=""/>
<input type="submit"/>
</form>
</body>
</html>
In above code, I'd tried to validate textfields when they lose focus. The script working fine if the name starts with A. But I want if the user enter different name which doesn't start with A it will return the focus to the textfield name. For that I'd written this script:
<script type="text/javascript">
var name = document.frm.name.value;
if(name.indexOf("A") == 0){
alert(name);
}else{
document.frm.name.focus();
}
</script>
then it doesn't works.
Anybody could help with that what should I do to request focus of textfield name?
I've only a little knowledge of javascript.
3 Answers
Reset to default 2Just give an id for you form and refer it with document.getElementById('form_id'). Use of name attribute in this context has been deprecated over a decade ago. Also name for input should be something else than "name", rather use username or sth.
HTML:
<form id="frm" action="test.php">
Enter name:<input type="text" name="username" id="username" onblur="validate()"/>
Enter e-Mail:<input type="text" name="email" id="email" onblur=""/>
</form>
JavaScript:
function validate(){
var form = document.getElementById('frm');
if (form.username.value.indexOf("A") === 0) {
alert(name);
} else {
form.username.focus();
}
}
Instead of retrieving the id of the form, you can also pass the form to validate() as an argument: onblur="validate(this);". Then use that argument as a form in the eventhandler:
function validate(form){
if (form.username.value.indexOf("A") === 0) {
alert(name);
} else {
form.username.focus();
}
}
EDIT
Focus doesn't seem to work without a delay, you can try this (the inputhas an id="username"):
function focusTo (elm) {
elm.focus();
return;
}
function validate(){
var form = document.getElementById('frm');
if (form.username.value.indexOf("A") === 0) {
alert(name);
} else {
alert('error');
setTimeout(function () {focusTo(form.username);}, 10);
}
}
modifiy your script like this
<html>
<head>
<script type="text/javascript">
function validate(){
var name=document.frm.name.value;
if(name.indexOf("A")==0){
alert(name);
}
}
</script>
</head>
<body >
<form id="frm" action="test.php">
Enter name:<input type="text" name="username" onblur="validate()"/>
Enter e-Mail:<input type="text" name="email" onblur=""/>
<input type="submit" onclick="check()"/>
</form>
<SCRIPT LANGUAGE="JavaScript">
<!--
function validate()
{
var name = document.getElementById('frm').username.value;
if(name.indexOf("A") == 0){
alert(name);
document.getElementById('frm').email.focus();
}else{
document.getElementById('frm').username.focus();
}
}
function check()
{
var name = document.getElementById('frm').username.value;
if(name.indexOf("A") == 0){
}else{
alert("Please enter a name starting with 'A'");
document.getElementById('frm').username.focus();
}
}
//-->
</SCRIPT>
</body>
</html>
You want to execute function validate() on event onblur. in the script you have written the code for focusing, but not added it in a function.
try this document.frm.username.focus(); . i hope it will work.
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