Determining which Submit button was clicked, when an array of buttons is used

Question

I have a script which generates a table containing numerous rows and coloumns. On each end of a row, is a Submit button, whose name is one of an array generated on running the script, and goes like: delete_CN[0], delete_CN[1] etc.

While processing the form POST, I need to determine which Submit button was clicked. Currently, when I see a print_r or dump_vars, I see the following: ["delete_CN"]=> array(1) { [0]=> string(6) "Delete" }, which does not give the array index of the button that was pressed.

How should I best go about doing this? I need to find the array index of the submit button which was pressed, or another way to uniquely identify the row of the Submit button, to process the data. The original form is dynamically generated by reading a zonefile, and the elements on the same row are all arrays.

Andreas Linden · Accepted Answer · 2013-07-19 09:13:25Z

the post data will always include all buttons but only the one which was clicked will have a value. this way you can determine easily which button was clicked by checking which value in the button array is not empty. (The value will be the text on the button as that text is defined in the value attribute).

JohnnyFaldo · Accepted Answer · 2013-07-19 09:13:15Z

In HTML/PHP you could make each row in the table a seperate form, and add a

<input type="hidden" name="which_clicked" value="delete_CN[0]">

then look for $_POST['which_clicked']

or you could use jQuery and have a which value is inserted based on which submit button is clicked.

super user friendly, that button label would offer the user tea and biscuits

staabm · Accepted Answer · 2013-08-01 10:36:06Z

0

Be aware that a form can also be submitted using the ENTER key. In case this happens the browser handles it like the first button in the form was clicked.

Obviously, pressing ENTER when focus is on a submit-button sends the form using this currently focused button.

edited Aug 1, 2013 at 10:36

answered Jul 19, 2013 at 9:16

staabm

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2 Comments

Andreas Linden Over a year ago

this is not correct, it depends on the focus, also you can catch the enter key and stop the event.

staabm Over a year ago

when focus is on a button ENTER submits the form using it, thats right. I adjusted my previous comment accordingly. When javascript is in the game, everything can happen, thats also right. My note above was targeted on a simple case and describes browser default-behaviour.

binyo66 · Accepted Answer · 2013-12-13 01:58:16Z

What I do, I create an array of input type hidden, with "unique value", and those value we assigned to each button. such as input type = "hidden" name = "txtID[]" id = "txtID[]" value = "15618" and for the button input type="submit" name="CityAdd15618" id="CityAdd15618" value="+"

then when submit, you just need to loop

$lTtl=count($_POST['txtID']); for($lCtr1=0; $lCtr1<$lTtl; $lCtr1++) { if (isset($_POST['CityAdd' . $_POST['txtID'][$lCtr1]])) break; } echo "ttl:" . $lCtr1 . "<br>\n";

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