I have no brain

@crispy_duckMay 02.2003

hi all,

I had to join this forum to ask for some help as I’m on my own in the office and my brain is not working.
I’ve got a little JS experience but am still learning , thats why I’m stuck on what should be something simple but i need help.

I have a form checking function but need to change it a little.

First part:

if (document.myForm.postcode.value == “”){ alert(‘Please enter a postcode’); return false;

i need to change this part so I can check for a LETER at the start of the string entered in to the INPUT box.

Second part:

if (document.myForm.contact.value == “telephone”){ if (document.myForm.phone.value == “”){ alert(‘If you want us to contact you via telephone, please provide your phone number’); return false; }

I want to change this so that a number must be entered and it must start with a 0.

can anyone help, its been a long day.

thanks

to post a comment

JavaScript

6 Comments(s) _↴

@D_ohMay 02.2003 — #Hi,

I have some java script from a site, which checks British post codes, Do not take it as read, though, I think this is the sites url http://javascript.internet.com/ you will have to do some searhing of the site, this is a great site for me, I have learnt by trial and error! I have the file on this computer somewhere coz I thought it may be useful!

Rod

?

@crispy_duckauthorMay 02.2003 — #hey thanks,

i've used javascript.internet many times and its usually a great help.

I've figured out how to make sure i get a number on the phone field, now i need to make sure its a ZERO.

I'll try to find the script for the postcode.

@cmelnickMay 02.2003 — #If you are familiar with regular expressions, they can be used with Javascript, and are quite powerful pattern matching. Try this:

The tricky part is getting the regular expression right. I don't know what the postal codes are in your area, so for the example below, the postal code must be one letter followed by 4 numbers.

The regular expression is between the two /'s. I will go through step by step explaining each element in the regular expression. Feel free to contact me and tell me your exact needs, and I can help create you a working reg exp.

So my reg exp below is ^{^[a-z]{1}[0-9]{4}$}
[list]

[*]The "gi" afterwords says match [b]g[/b]lobally, and case [b]i[/b]nsensitive.

[*]The [b]^{^}[/b] says start matching at the beginning of the string.

[*][b][a-z][/b] says match any character in the range between the [b][[/b] and [b]][/b] (so a, b, c, ..., y, z) The case insensitive will match A-Z too. The alternate way to do this would be [b][a-zA-Z][/b], which will match a, b, c, ...z, A, B, C, ...Z. [b][a-zA-Z0-9][/b] would match a-z, A-Z and 0-9.

[*][b]{1}[/b] says match the previous pattern [b]{[/b]x[b]}[/b]

times.

[*][b][0-9][/b] says match any number.

[*][b]{4}[/b] says match previous pattern 4 times.

[*][b]$[/b] says match until the end of the string.

[/list]

If you didn't have the [b]^{^}[/b] at the beginning, the string "a1234" would be correct, but so would "abcde1234". If you didn't have the [b]$[/b] at the end, "a1234" would be correct, but so would "a123456789".

See http://sitescooper.org/tao_regexps.html for more detailed information on using regular expressions.

<i>
 </i>
 &lt;html&gt;
 &lt;head&gt;
 &lt;title&gt;Test&lt;/title&gt;
 &lt;/head&gt;
 &lt;body&gt;
 &lt;form name="test" onSubmit="return checkForm();" action=""&gt;
 Postal code: &lt;input type="text" name="postCode"&gt;&lt;br&gt;
 &lt;input type="submit" value="Check Form / Submit"&gt;
 &lt;/body&gt;
 &lt;script language="javascript"&gt;
 
 function checkForm() {
 var regExp_postCode = /^[a-z]{1}[0-9]{4}$/gi;
 
 if (regExp_postCode.test(document.test.postCode.value)) {
 alert ("Is a valid postal code");
 return true;
 } else {
 alert ("Is not a valid postal code");
 return false;
 }
 
 }
 &lt;/script&gt;
 
 &lt;/html&gt;

@cmelnickMay 02.2003 — #[i]Originally posted by crispy_duck [/i]

[B]hey thanks,

i've used javascript.internet many times and its usually a great help.

I've figured out how to make sure i get a number on the phone field, now i need to make sure its a ZERO.

I'll try to find the script for the postcode. [/B][/QUOTE]

So, using my regular expression above, if you needed a phone number that started with 0 and had x numbers following, the regular expression would be:

/^{^0{1}[0-9]{x}$/}

but replace x with how many numbers you need after the 0.

A more complicated test pattern would be to test to see if they put the "-" between sets of numbers. If they entered 0-342-3724 or 03423724, both should work. The test for this would be:

/^{^0{1}-?[0-9]{3}-?[0-9]{4}$/}

The "?" says match the previous pattern 0 or 1 times. In this case, the previous pattern is "-".

One MORE step of complexity is I believe that European phone numbers aren't necessairly all the same length, so you could also have 0-342-3724, but you might also have 0-342-11702. In this case, just add more to the number of times to match:

/^{^0{1}-?[0-9]{3}-?[0-9]{4,6}$/}

{4,6} says match 4, 5, or 6 times.

Send me an e-mail if you want specific help, or want me to create a reg exp for you.

@PadrillMay 02.2003 — #Check out this link:

[URL=http://developer.netscape.com/docs/manuals/communicator/jsguide4/expr.htm]Expressions and Operators[/URL]

It's part of the Netscape JavaScript guide. Scroll down to Regular Expressions and uncover the wonderful world of pattern matching ?

------------

You're welcome ?

@crispy_duckauthorMay 02.2003 — #thanks to all.

I'm not gonna make the form checking to complex, i just want to make sure i get a ZERO at the start of the phone number filed and any letter at the start of the postcode field.

I have used this to check for a number in the phone filed:

 if (parseInt(document.forms[0].phone.value)
   != document.forms[0].phone.value) {
   alert('Please enter a phone number, numbers only');
   return false;
 
   }

and it works ok. I'm not used to using Reg Ex so i'm just guessing at the moment. I'll give it a try for a while.

Also in #JavaScript _↴

Time table Planner body onload to delay Furl feed I Need Help Again!

Success!

Help @crispy_duck spread the word by sharing this article on Twitter...

Tweet This

I have no brain

6 Comments(s) _↴

Also in #JavaScript _↴

Success!

Social

Version

I have no brain

6 Comments(s) ↴

Also in #JavaScript ↴

Success!

The web is an endless sea of information. Don't miss the boat... Subscribe!

Social

Version

6 Comments(s) _↴

Also in #JavaScript _↴