PHP get input value without submit

Question

Guys i have foreach loop where i list some prices. All price have own input radio button.

By default only one price from looping is checked. I want to get that value when page is lodaed.

I have one session where i store number of days. Based on these days I get the price of cars.

$numDays = $_SESSION['days']; // 5
$calculate_km = $numDays * 140;  // 5*140km

So in page where i want to show total KM i use:

if(isset($_SESSION['days']) {
    $numDays = $_SESSION['days'];
}else {
    // Show default selected radio button value
}

Problem is bcs price list with radio is on the some page and there is no sumbiting

My loop:

<?php if($prices = getCarPricePeriod($car->ID, $od, $do)):?>
    <?php $first = true; ?>
        <?php foreach ($prices as $price): ?>
            <tr>
                <td><input type="radio" name="price" value="<?= $price['value'];?>" <?= $first ? 'checked' : '' ?>> </td>
                <td><input type="text" name="price_name" value=" <?= $price['name'];?>">&euro;/per day</td>
            </tr>
        <?php endforeach; ?>
    <?php $first = false; ?>
<?php endif; ?>

Total KM : <span> <?= $numDays * 140 ;?> </span>

Only is posible to get that value if i submit that form. So i need js for this or any way to do this in php

Please discribe more the context I want to get that value when page is lodaed (then when you will get it what you want to do?) the context is not clear. — Zakaria Acharki
– Zakaria Acharki, Commented Mar 2, 2016 at 16:00
@Zend "If SESSION['days'] exist set session value. If not exist get value from selected radio button with js. How to put execute that js in that variable if session is not definded" What do you mean by "get value" ? Resend value back to php ? Could you achieve this in php if(isset($_SESSION['days']) { $numDays = $_SESSION['days']; }else { $numDays = $price['name'] } ? — guest271314
– guest271314, Commented Mar 2, 2016 at 16:20

guest271314 · Accepted Answer · 2016-03-02 16:03:19Z

1

I want to get that value when page is lodaed.

Use .ready() , selector $("tr input:checked") , .val()

$(document).ready(function() {
  var val = $("tr input:checked").val()
})

answered Mar 2, 2016 at 16:03

guest271314

1

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Comments

Emil S. Jørgensen · Accepted Answer · 2016-03-02 16:07:26Z

1

If what you are asking is "how to send data from client-side to server-side", then the answer is AJAX.

Take a look at W3School's AJAX tutorial here: http://www.w3schools.com/ajax/

EDIT 1

for javascript, this should do it:

document.querySelector("input[type=radio]:checked").getAttribute("value")

edited Mar 2, 2016 at 16:07

answered Mar 2, 2016 at 15:57

Emil S. Jørgensen

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1 Comment

Ivan Over a year ago

I dont want to send data i need just value for other calculation.

Han Arantes · Accepted Answer · 2016-03-02 15:59:24Z

0

Without submit, you need JavaScript to do that, like this:

<script>
    var p = document.getElementByName("price");
</script>

answered Mar 2, 2016 at 15:59

Han Arantes

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