Question

check only 1 string out of 3 has a value

Asked by: NeilT

Hi

I have the following getters getting me the value of 3 previous input form field values. Only 1 should be completed (e.g. if tpn has a value OTHER THAN "" then dln and typ SHOULD BE "")

String tpn = form.getTaxiPlateNumber();
String dln = form.getDriversLicenceNumber();
String typ = form.getType();

How can I check to see that at least 1 is completed, but NO MORE

Many thanks
Neil

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Asked On
2009-04-28 at 10:43:57ID24362672
Topic

Java Programming Language

Participating Experts
3
Points
500
Comments
16

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Answers

 

by: gibu_georgePosted on 2009-04-28 at 10:46:43ID: 24253165

You need to add the condition while setting the values to form

 

by: CEHJPosted on 2009-04-28 at 10:46:45ID: 24253167

Put them in an array and iterate

 

by: CEHJPosted on 2009-04-28 at 10:48:10ID: 24253192

It would certainly be better to do this at the UI though. You could disable / hidethe other two fields

 

by: gibu_georgePosted on 2009-04-28 at 10:50:34ID: 24253225

yes add the validation to the UI itself

 

by: NeilTPosted on 2009-04-28 at 10:51:33ID: 24253235

I'm just bodging my way in Java, can you show me some code using my example please? I'm usig struts if that makes any differnce so this is in the action form?

Thanks
Neil

 

by: CEHJPosted on 2009-04-28 at 12:19:20ID: 24254210

Keep the three elements in an array and put the following attribute in each input tag:

onblur="disableOtherTwo(this)"

The function called would be something like:

function disableOtherTwo(formElement) {
	for(i = 0;i < elements.length;i++) {
		elements[i].enabled = (elements[i] == formElement);
	}
}

                                              
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by: NeilTPosted on 2009-04-28 at 13:10:58ID: 24254727

Thanks, so I would make them an array by something like this?

arrElem[] = Array (tpn,dln,typ);

 

by: CEHJPosted on 2009-04-28 at 13:39:03ID: 24254888

Yes, that kind of thing

 

by: objectsPosted on 2009-04-28 at 14:38:01ID: 24255412

use something like this:

int completed = 0;
if (tpn.length()>0) completed++;
if (dln.length()>0) completed++;
if (typ.length()>0) completed++;
if (completed==1) {
   // only one completed
}

 

by: NeilTPosted on 2009-04-29 at 00:57:56ID: 31575587

Spot on, thanks
Neil

 

by: CEHJPosted on 2009-04-29 at 01:02:04ID: 24258103

That won't prevent them doing the 'wrong' thing

 

by: NeilTPosted on 2009-04-29 at 02:13:31ID: 24258457

This was the final bit of code from above, the action does the validation:
Thanks for all your help,
Neil

String tpn = form.getTaxiPlateNumber();
		String dln = form.getDriversLicenceNumber();
		String drn = form.getDriversName();
		int completed = 0;
 
		if (tpn.length()>0) completed++;
		if (dln.length()>0) completed++;
		if (drn.length()>0) completed++;
 
		if (completed==1) {
			// only one completed so check
			if (tpn.length()>0) {
			    //Validate Taxi Plate Number
			    errors = PayHCLValidator.validateTaxiPlateNumber(form.getTaxiPlateNumber(), PayHCLProperties.taxiPlateNumberPattern, errors);
			}
			if (dln.length()>0) {
				//Validate Drivers Licence Number
				errors = PayHCLValidator.validateDriversLicenceNumber(form.getDriversLicenceNumber(), PayHCLProperties.driversLicenceNumberPattern, errors);
			}
		} else {
			// more than one completed so return error
			errors.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage("global.error.validating", "Information Fields", "Only 1 field can be completed per licence type"));
		}
 
    //Validate Type
    errors = PayHCLValidator.validateHCLType(form.getType(), errors);

                                              
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by: objectsPosted on 2009-04-29 at 02:14:40ID: 24258462

glad I could help :)

 

by: CEHJPosted on 2009-04-29 at 03:03:40ID: 24258717

>>This was the final bit of code from above, the action does the validation

Yes, that will work but of course is wasteful of bandwidth and server resources when it can be done on the client

 

by: NeilTPosted on 2009-04-29 at 03:09:33ID: 24258744

Good point CEHJ but luckily this is internaly so not a problem but when I move this to a web based environment i will move to client side.

Regards
Neil

 

by: objectsPosted on 2009-04-29 at 15:37:26ID: 24265417

Its not a waste of resources, it is a necessity (and a very standard one)

:)

20120131-EE-VQP-002

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