Beginning PHP and MySQL E-Commerce: From Novice to Professional, Second Edition

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Emilian Balanescu and Cristian Darie

"Beginning PHP and MySQL E-Commerce: From Novice to Professional, Second Edition"

This response will be something like this:
{* Start cart summary *}

Cart Summary

Updating...

...

Our JavaScript code must take the contents of the root

element and inject them into the page under the
cart-summary

element. For this we used a regular expression named cartSummaryRegEx:
else
{
// Extract the contents of the cart_summary div element
var cartSummaryRegEx = /^

???
([\s\S]*)<\/div>$/m;
matches = cartSummaryRegEx.exec(response);
response = matches[1];
Alternatively, we could have used the XML DOM or the substring feature of string. The substring method is
the fastest and easiest to implement, but it has the disadvantage that it??™s not flexible. If the format of the output or
the name of the

element changes, it will not work anymore. Here??™s a possible implementation:
response = response.substring(25, response.length - 7);
After obtaining the string, updateCartSummary() uses it to replace the contents of the cart-summary element
of the page, effectively updating the cart summary. The ???Loading...??? text is also hidden:
// Update the cart summary box and hide the Loading message
document.getElementById("cart-summary").innerHTML = response;
// Hide the "Updating..." message
document.

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Emilian Balanescu and Cristian Darie

"Beginning PHP and MySQL E-Commerce: From Novice to Professional, Second Edition"