如何自动选择带有会话值的下拉框

Question

        <select>
        <?php  foreach($result as $city) { ?>
        <option value="<?php echo $city->city_name; ?>" <?php if( strtolower($this->session->city) == strtolower($city->city_name)  ) { echo "selected"; }  ?>
        > <?php  echo $city->city_name; ?>  </option>
        <?php   } ?>
        </select>

Hi i am trying to auto select drop down box with the help of session but i am not able to select please some one help me out how could i auto select drop down box.

Answer 1

First of all. You should always provide the whole code, eg. in format of PHPFiddle.

Secondly, you should not mix HTML and PHP.

Also your problem cannot be deciphered from your question, because there might be several reasons. Like the city name could be in uppercase or capitalized in your session variable.

Your session variable might not be initialized with your session in the class constructor.

Also you might even not have a class at all, so the reference to $this would be obsolete.

But those aside, here's a code that might help you:

<?php
class MockSession {
    function __construct() {
    }
}
class Foo {

function __construct() {
    $this->session = new MockSession();
    $this->session->city = "Helsinki";
}
function printSelect() {
    $result = array("London","New York","Helsinki");

    echo '<select>';
    foreach ($result as $city) {
        $sel = '';
        echo $city." ".$this->session->city;
        if (strtolower($city)==strtolower($this->session->city)) {
        $sel = ' selected="selected" ';
        }
        echo '<option value="'.$city.'" '.$sel.'>'.$city.'</option>';
    }
echo '</select>';
}

}

$foo = new Foo();
$foo->printSelect();
?>

Answer 2

If you got value of your session on the page then you have to just modify your code as selected="selected" . See updated code:

<select>
    <?php
        foreach ($result as $city) {
    ?>
        <option
            value="<?php echo $city->city_name; ?>"
            <?php if (strtolower($this->session->city) == strtolower($city->city_name)) {
                echo 'selected="selected"';
            }
            ?>> 
            <?php echo $city->city_name; ?>
        </option>
    <?php 
        }
    ?>
</select>

But you should have to confirm first that you got value of $this->session->city .