在中选择所选选项的简单方法 <select>从$ _POST给定的值？

Question

如何在发送的$_POST数据的HTML <select>输入的选项中添加selected="selected"位，而在每个选项中不使用if语句？

Answer 1

<?php

$options = array(1 => 'Banana', 2 => 'Apple');

foreach ($options as $key => $value) {
    echo '<option value=""';
    if ($key == $_POST['fruit']) echo ' selected="selected"';
    echo '>'.$value.'</option>';
}

?>

Answer 2

Programatically, you could do it like this:

$optionNames = array('This', 'Is', 'A', 'Test');
echo '<select id="testselect" name="testselect">';
foreach($optionNames as $currentOption) {
    echo '<option value="'.$currentOption.'"';
    echo $_POST['testselect'] == $currentOption ? ' selected="selected"' : '';
    echo '>'.$currentOption.'</option>';
}
echo '</select>';

Must confess I don't have a dev box up at the moment to test the above code, but it should be OK. (Apologies if not.) :-)

Answer 3

I suppose using an if statement for each option is most efficient.

But you can create an array containing empty strings except for the location of the option you want to select in order to eliminate the if statement.

$options = array(1 => 'Banana', 2 => 'Apple', 3 => 'Orange');
$selected_options = array_fill(1, sizeof($options), "");
if(array_key_exists($_POST['fruit'], $options))
    $selected_options[$_POST['fruit']] = " selected=\"selected\"";

echo '<select id="fruit" name="fruit">';
foreach($options as $optionId => $optionText)
    echo '<option value="'.$optionId.'"'.$selected_options[$optionId].'>'.$optionText.'</option>';
echo '</select>';