reaches end:

for(var i=0;i < mydata.length;i++){

Now create a variable and assign counter variable value to it:

var mydigit = mydata.charAt(i)

To screen out symbols, punctuation, and letters, place an if statement in loop:

if(mydigit < "0" || mydigit > "9"){

The || in if statement scans for both conditions.

The next line will alert user to any mistakes he/she has made:

alert(mydigit + " is not a number.")

Here is complete code including HTML: =============================================

You can test above code by copying and pasting it into a text document then view it in

your browser.

And that's how easy it is to test user input for numerical input.

if (isIE4){

return document.all[documentID];

}else if(isIE6){

return document.getElementById(documentID);

}else if (isNS4){

return document.layers[documentID];

}else if (isNS6){

return document.getElementById(documentID);

}

}

The above function comprimises by using typical test defined earlier to identify our browser DOM, and returns object identified by its ID / NAME pair. So whenever you need to do something to an object, this approach requires that you call getDOMObeject () function. For example, following will set value attribute of a hypothetical text box to 'test value'.

The value of this approach comes to front in scripts where you need to access multiple objects in your document. For example:

getDOMObject('txtMyTextBoxID2').value = "Test Value 2";

getDOMObject('txtMyTextBoxID3').value = "Test Value 3";

getDOMObject('txtMyTextBoxID4').value = "Test Value 4";

getDOMObject('txtMyTextBoxID5').value = "Test Value 5";

getDOMObject('txtMyTextBoxID6').value = "Test Value 6";

Looks like a lot less work, doesn't it?