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Asked: 2026-06-10T13:11:00+00:00

I’m building a form with radio buttons. <form id=land name=input method=POST action=test.php> <input type=radio

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I’m building a form with radio buttons. 

<form id="land" name="input" method="POST" action="test.php">
    <input type="radio" name="Albania" value="Albania" class="test">
    <input type="radio" name="Sweden" value="Sweden" class="test">
    <input type="radio" name="Norway" value="Norway" class="test">
    .....
    <input type="hidden" name="hidden" value="action">
    <input type="submit" value="Submit">
</form>

There are over 150 countries to choose from. And when you choose a country, the application I’m building shows a line chart representing the data for the country in question. I’ve built a script so that I can have multiple choices. Basically it builds an array of the selected values, and then builds a SQL query from the imploded array.

This works fine when I use the submit button to send the data. But I wanted the chart to update directly when the the user checked a radio button. I added 

onClick='this.form.submit()'

to the input field and this works fine.

My problem is that I can’t choose two values now, eg, Norway and Sweden to compare the two, because once I check one radio button the page loads and the value disappears and the radio button is unchecked.

So. How do I send the query without the value disappearing?

Any help much appreciated!

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1 Answer

  1. Editorial Team
    <input <?php if (!(strcmp($_POST['Albania'],"Albania"))) {echo 'checked="checked"';} ?> type="radio" name="Albania" value="Albania" class="test">
<input <?php if (!(strcmp($_POST['Sweden'],"Sweden"))) {echo 'checked="checked"';} ?> type="radio" name="Sweden" value="Sweden" class="test">
<input <?php if (!(strcmp($_POST['Norway'],"Norway"))) {echo 'checked="checked"';} ?> type="radio" name="Norway" value="Norway" class="test">

    But why don’t you use checkboxes instead; maybe the user what to uncheck one of the radio inputs.

    I recommend that you change the names of the radio buttons to: name="country[countryName]"
    it’s easier to retrieve the selected countries by doing implode()

    <input <?php if (in_array("Albania", $_POST['country'])) {echo 'checked="checked"';} ?> type="radio" name="country[Albania]" value="Albania">
<input <?php if (in_array("Sweden", $_POST['country'])) {echo 'checked="checked"';} ?> type="radio" name="country[Sweden]" value="Sweden">
<input <?php if (in_array("Norway", $_POST['country'])) {echo 'checked="checked"';} ?> type="radio" name="country[Norway]" value="Norway">

    Generate the radio buttons:

    <?php while($row = mysql_fetch_array($sth)) { ?> 
<input class="className" type="radio" name="country[<?php echo $row['land']; ?>]" value="<?php echo $row['land'];?>" onClick='this.form.submit()' <?php if (in_array($row['land'], @$_POST['country'])) {echo 'checked="checked"';} ?> /><?php echo $row['land'];?> 
<?php }?>
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