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Number only in a data entry box
- Thread starter nk9100
- Start date
Then why don't you do some of your own research and check before you fill the forum with your request that someone else do your work for you?
I suggest you do some research into regular expressions and onchange.
Jeff
[tt]Jeff's Page [/tt][tt]@[/tt][tt] Code Couch
[/tt]
Keep in mind that there are a number of ways to enter text in a box besides typing, like pasting, autocomplete, and dragging. Your code will have to account for these methods and possibly others.
It might be easier to allow the user to enter anything they want, then validate it when they leave the field.
Adam
It might be easier to allow the user to enter anything they want, then validate it when they leave the field.
Adam
theniteowl
Programmer
nk9100
Here is the isNum function.
When you do your test, pass the current value of the field to this function and it will return true if it is a number and false if not.
function isNum(passedVal) // is passed value a number?
{
if (passedVal == '')
{
return false;
}
for (i=0; i<passedVal.length; i++)
{
if (passedVal.charAt(i) < '0')
return false;
if (passedVal.charAt(i) > '9')
return false;
}
return true;
}
Here is the isNum function.
When you do your test, pass the current value of the field to this function and it will return true if it is a number and false if not.
function isNum(passedVal) // is passed value a number?
{
if (passedVal == '')
{
return false;
}
for (i=0; i<passedVal.length; i++)
{
if (passedVal.charAt(i) < '0')
return false;
if (passedVal.charAt(i) > '9')
return false;
}
return true;
}
<HTML>
<HEAD>
<TITLE>test </TITLE>
<script>
function validateField()
{
var fldValue = document.getElementById("inputNum").value;
if (isNaN(fldValue))
{
alert("The value must be numeric!!!!!!!!");
return false;
}
return true;
}
</SCRIPT>
</HEAD>
<FORM name="test" id="test" ACTION="" METHOD="POST">
Enter a number: <input type="text" name="inputNum" id="inputNum" value="">
<br><br>
<input type="submit" name="butn" value="Submit" onClick="return validateField();">
</form>
</HTML>
<HEAD>
<TITLE>test </TITLE>
<script>
function validateField()
{
var fldValue = document.getElementById("inputNum").value;
if (isNaN(fldValue))
{
alert("The value must be numeric!!!!!!!!");
return false;
}
return true;
}
</SCRIPT>
</HEAD>
<FORM name="test" id="test" ACTION="" METHOD="POST">
Enter a number: <input type="text" name="inputNum" id="inputNum" value="">
<br><br>
<input type="submit" name="butn" value="Submit" onClick="return validateField();">
</form>
</HTML>
- Thread starter
- #6
Hi, I actually used an OnKeyUp method which serves my purpose, thanks to everyone, I apologise for posting the question, but sometimes, we all just think as we type!, thanks to you all.
Life is a journey that always ends up in the same place
Life is a journey that always ends up in the same place
deputydoofy
Programmer
You could certainly check the value of the keypressed. I don't know the code off the top of my head, but I've used it before. Have it simply ignore (return false somehwere) if not a number.
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