how to change input value via url dynamically

Question

I am using this url to change value of Price in my code.

http://yoursite.com/mycart.php?am=20&product=Digitizing

I want that whenever I change the value of am= in the url , the value='0' must be changed in the code dynamically according to that.

<input type='hidden' name='li_1_price' value='0' />

So you pass the price as a query string via GET? That is not a good idea. I can just change the URL to a price I want. Use a POST request or at least check the price at the backend with your database. — Aaron3219
– Aaron3219, Commented Nov 15, 2019 at 22:02

durbnpoisn · Accepted Answer · 2019-11-15 21:35:00Z

1

You just need to intercept the value with PHP and then write the variable to the code.

<?php $amValueIs = $_GET["am"]; ?>

Then in your HTML

<input type='hidden' name='li_1_price' value='<?php echo $amValueIs; ?>' />

That's all there is to it.

EDIT as per comments: If you want to be sure that "am" has a value so you don't kick up a warning:

$amValueIs = isset($_GET["am"]) ? $_GET["am"] : "0";

Which is a shorthand for "if it's set then use it, if not give it a 0". I also added that "php" to the other open tag, just in case.

edited Nov 15, 2019 at 21:35

answered Nov 15, 2019 at 20:59

durbnpoisn

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2 Comments

Funk Forty Niner Over a year ago

Just a few things if I may. 1) It's good to make sure that the GET array is set/not empty, same for the value in the input. 2) The <? in the value might trigger an error if they do not have short tags enabled.

IncredibleHat Over a year ago

Also, its good to sanitize that string, since you are effectively passing GET straight to html.

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