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<form action="http://www.cknuckles.com/cgi/echo.cgi" method="get" name="logOn">
User Name:<br />
<input type="text" name="userName" size="25" /><br />
Password:<br />
<input type="password" name="pw" size="25" /><br />
<input type="submit" value="Log In" onClick="validate()"/>
</form>
Thats my HTML, I have figured out how to only get alpha numerical data into the fields, but how do I get it to only allow a User Name that starts with a capital?
<script language="javascript">
</script>
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The toUpperCase() method converts a string to uppercase letters. The toUpperCase() method does not change the original string.
Naming Convention for Variables JavaScript variable names are case-sensitive. Lowercase and uppercase letters are distinct. For example, you can define three unique variables to store a dog name, as follows. However, the most recommended way to declare JavaScript variables is with camel case variable names.
The toLowerCase method converts a string to lowercase letters. The toLowerCase() method doesn't take in any parameters. Strings in JavaScript are immutable. The toLowerCase() method converts the string specified into a new one that consists of only lowercase letters and returns that value.
The simplest way to capitalize the first letter of a string in Java is by using the String. substring() method: String str = "hello world!"; // capitalize first letter String output = str. substring(0, 1).
The simplest way to check this is with a regular expression:
function(str){
return /^[A-Z]/.test(str);
}
returns true when the input string starts with a capital, false otherwise. (This particular regular expression - the bits between the // characters - is saying, 'match the start of the string followed by any single character in the range A-Z'.)
In terms of your HTML above, we'll need the contents of the validate() function to determine where the regex match needs to go.
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