Separate submit buttons on forms which tell form “

I have included an additional Submit button within my form which I am going to use like so.

User selects item
User hits "Add another item" Submit button on form.
Form POSTS to itself and reloads the page so user can add another item
Once user has added several items the user hits "Finished" Submit button.
The form posts to another file with all the accumulated items.

I have a uneasy feeling that this might not be achievable with PHP/HTML alone and that I might have to use some Javascript to modify the form action before the form starts to POST data?

Thoughts and ideas?

Thanks

回答1:

You can use JavaScript to modify the form based on which button is clicked, or you can check server side (i.e. using PHP) which button was clicked and act accordingly.

A submit-button is a form-input just like any other, i.e. you can give it a name and a value, which you can check for server side.

On client side (i.e. using JavaScript) you would bind a handler to the button's click-event, modify the form's action-attribute and submit it to the new address.

Here's a client side example:

<!doctype html>
<html>
    <head>
        <title>Form submit test</title>
    </head>
    <body>
        <form action="baz.html" method="post">
            <input id="bar" type="submit" class="button" value="bar.html" name="" />
            <input id="foo" type="submit" class="button" value="foo.html" name="" />
        </form>

        <script>
            // Find the two buttons from the DOM and assign them to separate variables
            var barBtn = document.getElementById('bar'),
                fooBtn = document.getElementById('foo');

            // Click-handler for the buttons. 
            // NB! For this code to work as intended, it needs to run 
            // in the context of the button, otherwise, the this-keyword 
            // will not resolve correctly and this will result in an error
            // NB2! This code also requires that a button's value will be
            // the desired action handler. Usually you would probably not
            // do this, but use the button's name/value to lookup the 
            // correct form action.
            function modifyAction(e) {
                this.form.action = this.value;
            }

            // Bind an event handler to an object
            // NB! This is not code you should use in production
            function bindEvent(target, event, callback) {
                if (target.addEventListener) {
                    target.addEventListener(event, callback, false);
                } else if (target.attachEvent) {
                    target.attachEvent('on' + event, callback);
                }
            }

            // Delegate creates a wrapping closure which binds the 
            // original function's context to an object, i.e. ensuring
            // the this-keyword always refers to the same object when
            // the returned function is invoked. 
            function delegate(context, method) {
                return function () {
                    return method.apply(context, arguments);
                }
            }

            // Bind the click-event of the barBtb, and handle it
            // with the modifyAction-function bound to the barBtn.
            // I.e. run the modifyAction function, with the this-keyword
            // bound to barBtn
            bindEvent(barBtn, 'click', delegate(barBtn, modifyAction));

            // Same as above for fooBtn
            bindEvent(fooBtn, 'click', delegate(fooBtn, modifyAction));
        </script>
    </body>
</html>

Just for sake of completeness, here's a jQuery-example of the same:

<form action="baz.html" method="post">
    <input id="bar" type="submit" class="button" value="bar.html" name="" />
    <input id="foo" type="submit" class="button" value="foo.html" name="" />
</form>

<script>
// Jquery event-handlers are automatically bound to
// the element selected, so using "this" is safe
function modifyAction(e) {
    this.form.action = this.value;
}

// Bind the click-event on all input with type=submit
$("input[type=submit]").click(modifyAction);
</script>

回答2:

Give the two submit buttons the same names but different values. You can check the value in your php file.

Example

<form action="something.php" method="post">
<input type="submit" name="submit" value="one">
<input type="submit" name="submit" value="two">
</form>

something.php

switch( $_POST['submit'] ) {
    case 'one':
    case 'two':
}

回答3:

You could do this without javascript. Just give your submit button names with different values:

<button type="submit" name="btn" value="addItem">Add item</button>
<button type="submit" name="btn" value="finish">Finished</button>

Now inside the script you are posting the form to you can determine which button was clicked by examining the $_POST['btn'] value and take the respective actions.