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问题:

I'm having trouble with more then one submit Buttons in HTML & PHP, i tried to code a GUI for a web-based calculator. That's realy easy, but the function in php isn't so easy. So i have this simple GUI with 6 submit buttons:

<?php 
$output= isset($_POST['output']) ? $_POST['output'] : "";

function calc(){
//calculate...
}

?>
<!DOCTYPE html>
<html lang="de">
<head>
<meta charset="utf-8" />
<title>Calc</title>
<style type="text/css">
 .bwidth {
      width: 100%;
}
</style>
</head>
<body>
    <form action="calc.php">
        <h1>
            <u>MY Own Calculator</u>
        </h1>
        <table border="3px" type="box" cellspacing="5px" width="250px">
            <tr style="height: 24px;">
                <td colspan="3"><input type="text" name="<?php $ausgabe ?>"
                    value="0" style="width: 98%;" /></td>
            </tr>
            <tr>
                <td><input class="bwidth" type="submit" name="1" value="1" /></td>
                <td><input class="bwidth" type="submit" name="2" value="2" /></td>
                <td><input class="bwidth" type="submit" name="3" value="3" /></td>

            </tr>
            <tr>
                <td><input class="bwidth" type="submit" name="minus" value="-" /></td>
                <td><input class="bwidth" type="submit" name="plus" value="+" /></td>
                <td><input class="bwidth" type="submit" name="enter"
                    value="=" /></td>
            </tr>
        </table>
    </form>
</body>

Now how I can differentiate these many submit buttons? It's even possible to have more than one submit button? I tried it to seperate the buttons by the value... but it didn't work.

And sb has an idea how i can add a value to an existing value in the textfield? So i can push button 1 and it will write 1 in the textfield and when i will push button 2 it will add the number 2 so it will a "12"?

Thanks for all suggestions!

回答1:

You can try to verify which button is set using isset($_GET['input_name']).

Or you could name different the inputs:

<form action="calc.php">
    <h1>
        <u>MY Own Calculator</u>
    </h1>
    <table border="3px" type="box" cellspacing="5px" width="250px">
        <tr style="height: 24px;">
            <td colspan="3"><input type="text" name="<?php $ausgabe ?>"
                value="0" style="width: 98%;" /></td>
        </tr>
        <tr>
            <td><input class="bwidth" type="submit" name="digit" value="1" /></td>
            <td><input class="bwidth" type="submit" name="digit" value="2" /></td>
            <td><input class="bwidth" type="submit" name="digit" value="3" /></td>

        </tr>
        <tr>
            <td><input class="bwidth" type="submit" name="operation" value="-" /></td>
            <td><input class="bwidth" type="submit" name="operation" value="+" /></td>
            <td><input class="bwidth" type="submit" name="operation" value="=" /></td>
        </tr>
    </table>
</form>

And in your function:

function calc(){
    $op = isset($_GET['operation']) ? $_GET['operation'] : null;
    switch ($op) {
       case "+": .... ; break;
       case "-": .... ; break;
       case "=": .... ; break;
       default: "not supported";
    }

}

回答2:

In your php

if(isset($_POST['minus'])) {
  // selected minus
}

if(isset($_POST['plus'])) {
  // selected plus
}

if(isset($_POST['enter'])) {
  // selected enter
}

When you click on a button its going to be send with your post data to the server. All the post data you find in the $_POST array.

If you want to look whats in the $_POST array you can run this small code:

<?php
   echo '<pre>' . print_r($_POST, true) . '</pre>';
?>

回答3:

You can do this using JavaScript, first you will have to change your <form> to something like:

<form id="form1" name="form1" method="post" action="calc.php">

Then the JavaScript and the buttons should look like this:

<script>
function submitForm(action)
{
    document.getElementById('form1').action = action;
    document.getElementById('form1').submit();
}
</script>

...

<input type="button" onclick="submitForm('page1.php')" value="submit 1" />
<input type="button" onclick="submitForm('page2.php')" value="submit 2" />

回答4:

May be you can use one name for all the submit buttons.

<input type="submit" name="operator" value="+" />
<input type="submit" name="operator" value="-" />
<input type="submit" name="operator" value="=" />

and you can get the values in php

<?php
    $opr = $_GET['operator'];
    if($opr == "+") {
         //do something
    } else if($opr == "-") {
         //do something
    } else if($opr == "=") {
         //do something
    }
?>

回答5:

when you submit the form to calc.php

Inside calc.php check which form element received.

if(isset($_REQUEST['minus']))
{
    // minus is clicked
}
else if(isset($_REQUEST['plus']))
{
    // plus is clicked
}
else if(isset($_REQUEST['enter']))
{
    // enter is clicked
}

The clicked button will be sent with the form, not the others...

Hope it helps...

回答6:

Yes, you can have n number of submit buttons in a form.

Specify the action page in the same line as with the submit button.

<form action="actionpage.php">
<input type="submit" value="1">
<input type="submit" value="2" formaction="postPage.php">
</form>

UPDATED - IF ISSUES IN IE

<form>
<input type="submit" value="1" onclick="document.formName.action='abc.php';">
<input type="submit" value="2" onclick="document.formName.action='xyz.php';">
</form>

回答7:

You can use JavaScript to submit your form. After clicking button, you call JS function that set some hidden element with pushed operation and then submit form to server.