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Doing a calculation based on the entries made by a user in two seperate form fields - possible?

Thread began 5/13/2015 12:41 pm by Nathon Jones Web Design | Last modified 5/20/2015 4:28 pm by Ray Borduin | 862 views | 5 replies |

Nathon Jones Web Design

Doing a calculation based on the entries made by a user in two seperate form fields - possible?

My client has asked for a form where the user selects values from a drop down menu. Those values have a monetary value, for example

Rental Fee:
<input type="text" value"350">

Number of Pets:
<select>
<option value="1">1</option>
<option value="2">2</option>
</select>

Insurance Required:
<select>
<option value="1">Yes</option>
<option value="0">No</option>
</select>

Pets are charged at £15.00 each and the insurance is £16.00 so, in the above example, if a user selects 2 pets and insurance I need it to add £46.00 (2 x £15.00 and 1 x £16.00) to the Rental Fee value (£350).

Is this possible via validation? Show If?

Would appreciate your advice. Thank you.
NJ

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Ray BorduinWebAssist

Validation is just used to force a selection and not do calculations.

The eCart has calculation options. Are you adding the items into a cart? The cart could do the calculations and show a total. If you want to show it on the page as the selections change, you would probably have to do the calculations and updates manually using javascript. We could help with that in a premier support ticket.

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Nathon Jones Web Design

If we have a confirmation page that displays the form values, for example:

<?php echo((isset($_POST["formPETS"]))?$_POST["formPETS"]:"") ?>

...is it possible to do a calculation using PHP without involving eCart? So the person fills in the form, submits it, and are then shown a result page which has taken the values from the form and perform calculations on them in order to present a value?

So, if the above formPETS field was submitted as "2", which each pet costing £15.00 for example, a calculation along these lines would be done on the results page:

<?php echo((isset($_POST["formPETS"]))?$_POST["formPETS"]:"") ?> x 15

I knew how to do this in Classic ASP but PHP confuses the hell out of me when it comes to things like this.
Would appreciate any advice you could offer. Thank you.
NJ

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Ray BorduinWebAssist

<?php echo((isset($_POST["formPETS"]))?floatval($_POST["formPETS"])*15:"0") ?>

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Nathon Jones Web Design

Also related to this type of thing, how do you display the validated field OR a default value?

For example, I want to display the validated entry if the form has been submitted and has failed validation on another field or, if it hasn't yet been submitted, a default numerical value. This doesn't work, nor anything else like it that I've tried...

<?php echo(ValidatedField("thankyou_166","formPETS"):"0") ?>

Hope you can help as this is all that's outstanding on a particular page I'm working on.
Thank you.
NJ

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Ray BorduinWebAssist

<?php echo(ValidatedField("thankyou_166","formPETS")?ValidatedField("thankyou_166","formPETS"):"0") ?>

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