Passing a JavaScript Value to a PHP Variable (With Limitation)

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I understand that there are existing questions and answers that have already addressed this matter. I\'ve looked through them but my situation doesn\'t allow me to apply the

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小蘑菇

2020-12-17 08:41

What I'm really trying to achieve:

PHP variables getting JavaScript values in the same page in a Facebook iFrame. It is all right for the page to reload to pass parameter to itself.

Easiest way: Generate a form element, populate it with some (hidden) input fields, and POST it to your server.

AJAX is also possible, and maybe nicer for the user as it doesn’t require a reload.

Since your’re not describing any problem in detail, I can only assume it’s mostly due to a general lack of knowledge/experience in these matters on your part. So maybe look for some tutorials first, to get a general understanding of the techniques involved.

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小鲜肉

2020-12-17 08:44

It's still not clear whether you want to:

pass data that you receive in PHP via app_data to JavaScript, or
pass data from JavaScript to PHP.

Pass data from PHP to JavaScript

<head>
<script type="text/javascript">
var app_data = <?php echo json_encode($appData); ?>;
</script>
</head>
<body>
...

Pass data from JavaScript to PHP

$.ajax({
    url: location.pathname, // current page
    type: 'POST',
    data: {
        vara: 'hello',
        varb: 'world'
    },
    success: function() {
        // ...
    }
});

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忘了有多久

2020-12-17 08:52

You can do that easily with javascript for example HTML code:

<select id = "Select" onchange = "FijarPrecio (this.id);" >
    <option value = "10"> product 1 </ option>
    <option value = "20"> product 2 </ option>
    <option value = "30"> product 3 </ option>
</select>
<input type = "text"  name = "Price" id = "Price"/>
<script type = "text/javascript" >
    FijarPrecio function (id) {
       PrecioSel var = document.getElementById (id);
       PrecioActual var = document.getElementById ('Price');
       PrecioActual.value = PrecioSel.value;
    }
</script>

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