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Javascript problem...

Posted: Sun Mar 11, 2007 11:36 am
by dexter

I have a PHP page with submission form for collectiong billing information from the customer. When the customer selects his state of residence from a dropdown list, the page is refreshed and some tax calculation as performed. I’m using the “onChange” event for dropdown list to call a JavaScript, which then checks which state is selected, updates a value for a hidden field in the form and reloads the page. The value of this hidden field is then used by php code in the form to calculate the tax.
Here is JavaScript code:

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<script type='text/javascript'>
function calculateTax()
	state = ****.forms['checkoutform'].elements['billstate'];
	var stateVal = state.options[state.selectedIndex].value;
	if(stateVal == 'VT')
		****.forms['checkoutform'].elements['tax'].value = 0.07;
Everything so far is working great, but I have a problem. In order for the page to reloaded (to update the changed value of the hidden field), the form has to post to itself, as I understand it.

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<form name="checkoutform" action="" method="post" onsubmit="return validateCard(this.cardnumber.value,this.cardType.value,this.cardmonth.value,this.cardyear.value);">
But after the form is filled with customer information, when the submit button is pressed, all information in the form should be validated (I have credit card validation script and required fields validation script included) and then the form should be posted to other php page, for inserting the customer information into database and sending the confirmation e-mail.

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<form name="checkoutform" action="confirmorder.php" method="post" onsubmit="return validateCard(this.cardnumber.value,this.cardType.value,this.cardmonth.value,this.cardyear.value);">
<input type="submit" value="Make Purchase" ****="MM_validateForm('namefull','','R','email','','RisEmail','phonework','','R','billaddress1','','R','billcity','','R','billzip','','R');return ****.MM_returnValue;"/>

  1. How can I refresh the page/form and make some calculation when the dropdown list changes his value and at the same time to be able to submit the form to other php page?
  2. How to return the changed value of the hidden field from JavaScript, so the php code knows that some state is selected from the dropdown list and that it should run the tax calculation accordingly? And if this can be done without refreshing the page (or posting the form), my problem is solved. Thanks...

Posted: Tue Sep 04, 2007 8:07 pm
by Gyanu
it's very large

there may be the short way?

Posted: Wed Sep 05, 2007 6:45 am
by Lixas
To change a hidden field value withour page reload you can use:

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here is a simple form as example

<form name="form1"......>
<input type="text"...>
<input type="hidden" name="hidden_field" id="hidden_id" value="">

javascript problem

Posted: Thu Nov 29, 2007 12:56 pm
by Gebbo
hmm... looks interesting..

Posted: Fri Nov 30, 2007 1:24 am
by Tails5
You could create a PHP Session and insert the value into that, and destroy the session when the user finishes calculation.

Javascript problem

Posted: Sat Jul 17, 2010 4:38 am
by icopsistonync
Chanchal wrote:
> Hi,
> Any one knows about any java script function which capture the content
> of the browser window as image?
> Thanks
> Chanchal

It can be done in IE via an ActiveX control. Not only can it snapshot
the browser window, it can do the whole desktop.

But in JavaScript, no.


Posted: Tue Dec 07, 2021 6:09 pm
by Gilbertwep
The excellent and duly message.