Need info for custom math validator snippet please

406 Posts

TomMLS Reply #1, 14 years, 7 months ago

I want to validate the answer for Formit's math hook/captcha...

I want to validate that fi.value entered into the form really is the correct answer for

fi.op1 operator fi.op2

Formit validator would be [[!FormIt? &validate=`math:isCorrectAnswer`]]

<air code>
$answer = calculate fi.op1 operator fi.op2 taken from form
if is true math = answer then validate
else show validation error message
end if
</air code>

I'm at a loss to know how to pass the values back and forth between the form and snippet...
Has anyone done this before??

I do know about the 'isBigEnough' validator at
http://rtfm.modx.com/display/ADDON/FormIt.Validators

Thank you, Tom

This question has been answered by anso. See the first response.

659 Posts

anso Reply #2, 14 years, 7 months ago

Hi Tom
Create a snippet call it as you want (let say 'mathValidator' ) and put this code in it

$value = $value; // the input value in the field math

$op1 = $_POST['op1'] ; // value of field op1 
$op2 = $_POST['op1'] ; // value of field op1 
$operator = $_POST['operator'] ; // value of field operator (should be + or - )

switch($operator){
    case '+':
        $goodresult = $op1 + $op2; // result  if operator is 'plus' ...
        if($value!=$goodresult){ // if answer not equal expected result
            $validator->addError('math', 'The answer is false.');
            return false;
        }
        break;
     case '-':
        $goodresult = $op1 - $op2;
        if($value!=$goodresult){
            $validator->addError('math', 'The answer is false.');
            return false;
        }
        break; 
        
}
return true;

It should work (i did not test it but...)
in your formit call don't forget to add

[[!FormIt?  
&hooks=`email,redirect,math`  
&emailTpl=`email`
&emailSubject=`Website Inquiry` 
&emailTo=`[email protected]`
&emailCC=`[[+email]]`
&emailFromName=`[[+name]]`
&redirectTo=`27`
&customValidators=`mathValidator`,  // this line
&validate=`math:required:mathValidator` // and this one
]]

and remove the ':required' in the <input...>... Formit now needs to have customValidators explicitly declared in the snippet call, and the validation calls are now done via property '&validate'.
It should work with the latest versions of Formit (if yours is not the last I recommand to update)
Let me know if you run in trouble...
Cheers

406 Posts

TomMLS Reply #3, 14 years, 7 months ago

I will test...code looks good, I'm not a programmer so I could not have done that as quickly as you did. Thank you for taking time out to do that, hope you solve your gallery issue.
Thank you, Tom [ed. note: TomMLS last edited this post 14 years, 7 months ago.]

659 Posts

anso Reply #4, 14 years, 7 months ago

Hope it will work for you...
My Gallery issue is not solved at this time.. I guess the problem is somewhere with phpThumb but can't find where and how to solve... Hope someone in the forum have some clues...
Cheers

406 Posts

TomMLS Reply #5, 14 years, 6 months ago

Hello -- finally tested -- this always gives error message even when the answer is correct!! sad

Hope you have time to re-read the code, or p'raps someone else can read it...

How can I have the snippet echo back the values, particularly $value and

Thank you, Tom [ed. note: TomMLS last edited this post 14 years, 6 months ago.]

discuss.answer

659 Posts

anso Reply #6, 14 years, 6 months ago

Hi Tom

Try ot change

$op1 = $_POST['op1'] ;
$op2 = $_POST['op1'] ; // there's an error here it should be 'op2' not 'op1' (too fast copy/paste)

by

$op1 = intval( $_POST['op1']) ; // intval() to be sure the value of op1 and op2 are treated as numbers
$op2 = intval($_POST['op2']) ;

You can return the value of $value in the error log using

$modx->log(modX::LOG_LEVEL_ERROR, 'value :' . $value);

and put a specific error message in the form with

$validator->addError('nameofyourfield', 'the value should be '.$value);

Hope it will work,,let me know
Cheers

24,544 Posts

BobRay Reply #7, 14 years, 6 months ago

Doesn't FormIt have a math option that will do that automatically?

There is a mathstring option built in to the captcha plugin package. If you call it from your form, it generates the equation and writes the result to a $_SESSION variable, so all you have to do is check the $_SESSION variable against the user's input in your hook.

Here is the code from SPForm that displays the math string:

$captcha_image= '<img '. 'onclick="this.src=' . "'" . $this->modx->getOption('assets_url') . "components/captcha/captcha.php?rand='" .
            "+Math.floor(Math.random()*200);".'"' .' src="'. $this->modx->getOption('assets_url') . 'components/captcha/captcha.php?rand='.rand().'" alt="'.$alt.'" />';

        $this->modx->setPlaceholder('spf-captcha-instructions',$captcha_prompt);
        $this->modx->setPlaceholder('spf-captcha-image',$captcha_image);
        $this->modx->setPlaceholder('spf-captcha-input-prompt',$captcha_input_prompt);
        $this->modx->setPlaceholder('spf-captcha-input','<input type="text" name="verify"  value="" />');

        $spfCaptchaTpl = $this->modx->getOption('spfcaptchaTpl',$this->spfconfig,'spfcaptchaTpl');
        $this->modx->setPlaceholder('spf-captcha-stuff',$this->modx->getChunk($spfCaptchaTpl));

Also, I think you want the math hook ahead of the redirect hook.

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406 Posts

TomMLS Reply #8, 14 years, 6 months ago

The documentation should describe (and does not) the appropriate sequence for declaring built-in hooks -- another aspect of MODx that maintains its excellent niche status.

Thank you everyone, I will try both ideas and try to remember to update this thread.
Thank you,

tom

406 Posts

TomMLS Reply #9, 14 years, 6 months ago

UPdate:
sequence of validators is `email, math, redirect` -- this works correctly
upon fixing the typo and adding in the intval things work properly
I added at the very top this line:

if (trim($value) == "") return true; // exit if blank text box

Thank you again everyone for your help...

:)

tom

24,544 Posts

BobRay Reply #10, 14 years, 6 months ago

Quote from: TomMLS at Mar 24, 2012, 07:35 PM

The documentation should describe (and does not) the appropriate sequence for declaring built-in hooks.

It does now. wink

---------------------------------------------------------------------------------------------------------------
PLEASE, PLEASE specify the version of MODX you are using . . . PLEASE!
MODX info for everyone: http://bobsguides.com/modx.html

Did I help you? Buy me a beer
Get my Book: MODX:The Official Guide
MODX info for everyone: http://bobsguides.com/modx.html
My MODX Extras
Bob's Guides is now hosted at A2 MODX Hosting

Answered Need info for custom math validator snippet please