Javascript, PHP, Saving field value

Question

I am trying to save fields data after submited, Becouse after all the fields are good to go but lets say at the server side the user name is already taken so the form return empty and i dont want that there is the option to do it with PHP like that:

<input value="<?php if(isset($userName)) echo $userName; ?>" />

But the problem is with the radio input, If can some one think about solution about the radio with PHP i will be very thankful, Also i was thinking about Javascript so i will have cleaned code and i was thinking about taking the values from the URL but i am using POST for security reasons.

Summary: If anyone have a solution with PHP or Javascript i will be very thankful, Thank you all and have a nice day.

Guys thank you for your answers but i dont understand how can they work, i will be happy if you upload your code so i can see how does it work, and thanks again. — Aviel Fedida
– Aviel Fedida, Commented Jul 29, 2012 at 13:56
Your form's action attribute, is it posting back to the same page or another page? — codingbiz
– codingbiz, Commented Jul 29, 2012 at 14:15

codingbiz · Accepted Answer · 2012-07-29 14:31:42Z

1

Try this

<form name="myform" action="" method="post">
<input type="radio" name="language" value="Java" <?php echo(@$_POST['language'] == 'Java'?"checked":""); ?> /> Java
<input type="radio" name="language" value="VB.Net" <?php echo(@$_POST['language'] == 'VB.Net'?"checked":""); ?>  /> VB.Net
<input type="radio" name="language" value="PHP" <?php echo(@$_POST['language'] == 'PHP'?"checked":""); ?>  /> PHP

<input type="submit" />

edited Jul 29, 2012 at 14:31

answered Jul 29, 2012 at 13:48

codingbiz

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7 Comments

Aviel Fedida Over a year ago

Thank you codingbiz, its working, can you just tell me why the @ before the post?

HoLyVieR Over a year ago

@uBlankText It's an error suppression operator, if $_POST['language'] is not defined it won't display an error. See this : php.net/manual/en/language.operators.errorcontrol.php

Aviel Fedida Over a year ago

Thank you HoLyVieR, so its like @echo off, if i understand it right, the error is check for undefined index becouse the language index is not posted yet, am i right?

HoLyVieR Over a year ago

@uBlankText Yes, when you will load that page the first time there won't be any POST data available so it won't be able to find the index.

Aviel Fedida Over a year ago

I think i found a sort way please take a look: <?php if(isset($_POST['language'])) echo "checked"; ?> less code.

|

codingbiz · Accepted Answer · 2012-07-29 14:01:31Z

1

I think this may help you.

<input type="radio" value="choice1" name="radio_name" <?php echo(@$_POST['radio_name'] == 'on'?"checked":""); ?> />

edited Jul 29, 2012 at 14:01

codingbiz

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answered Jul 29, 2012 at 13:52

RAN

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Comments

HoLyVieR · Accepted Answer · 2012-07-29 14:23:21Z

1

If you want to automatically select a radio input you can add the attribute checked to it. What you are going to need will look like this :

<form method="POST">
    <?php

        // You have some short of list of possible value //
        $arrRadioValues = array("value1", "value2", "value3");

        // You display them //
        for ($i=0; $i<count($arrRadioValues); $i++) {
            ?>
                <input 
                    type="radio" 
                    name="radioInputName" 
                    value="<?php echo $arrRadioValues[$i]; ?>" 
                    <!-- If the value that was posted is the current one we have to add the "checked" so that it gets selected -->
                    <?php if (isset($_POST['radioInputName']) && $_POST['radioInputName'] == $arrRadioValues[$i]) { echo " checked"; } ?> />
            <?php
        }

    ?>

    <input type="submit" />
</form>

Adding the checked attribute works a little bit in the same as setting a value to an input. It's just that instead of defining the value attributes, you define the checked attribute when you want that radio to be selected.

edited Jul 29, 2012 at 14:23

answered Jul 29, 2012 at 13:42

HoLyVieR

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2 Comments

Aviel Fedida Over a year ago

Thank you HoLyVieR for you anwser, but i dont understand the for loop can you upload your code to an online engine so i can take a look how does it work becouse i dont know how to implement this at my code, and thanks again.

HoLyVieR Over a year ago

@uBlankText Usually you have some short of list of values for your radio button and you loop in those values to display all the radio control. When you pass the value that has the same value as the one that was posted you just need to add the checked attribute.

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