Question

我正在创建一个由数据库填充的多个下拉列表，有时会预先选择一个值。它所从的表格中有一个或多个客户以逗号分隔。

示例：“John Doe”可能是一个条目，“Jane Smith，John Doe，Guy Inc。”和另一个像“Jane Smith，Tom琼斯，“可能是下一个。

要生成不同选项的列表，我使用以下代码：

<?php

$result2 = "SELECT DISTINCT Customer FROM CustomerTracker WHERE Customer NOT IN ('', '---< Select Customer >---', 'Left Blank')";
$rs2 = odbc_exec($conncmse,$result2);
$CustomerData0 = '';

while($row = odbc_fetch_array($rs2)) {
    $Customer0 = $row['Customer'];
    foreach (explode(',', $Customer0) as $Customer) {
        $CustomerData0 .= "<option>" . trim($Customer, " ") . "</option>";
    }
}

$CustomerData = implode('</option><option>',array_unique(explode('</option><option>', $CustomerData0)));

echo $CustomerData;

echo '<select name="Select1" multiple="multiple">';
echo $CustomerData;
echo '</select>';

它工作正常，但如果我想有一个预先选择的客户，我想出了这个：

$SelectedCustomer = "John Doe";

$result2 = "SELECT DISTINCT Customer FROM CustomerTracker WHERE Customer NOT IN ('', '---< Select Customer >---', 'Left Blank')";
$rs2 = odbc_exec($conncmse,$result2);
$CustomerData0 = '';
while($row = odbc_fetch_array($rs2)) {
    $Customer0 = $row['Customer'];
    foreach (explode(',', $Customer0) as $Customer) {
        if(strpos($SelectedCustomer, $Customer) !== false) {
            $CustomerData0 .= "<option selected='selected'>" . trim($Customer, " ") . "</option>";$SelectedCustomer = "";
        }
        else {
            $CustomerData0 .= "<option>" . trim($Customer, " ") . "</option>";
        }
     }
}

$CustomerData = implode("</option><option>",array_unique(explode("</option><option>",  $CustomerData0)));

?>

我遇到的问题是我只能使用分隔符</option><option>，因此我得到了所选客户的副本。我真正需要的是一种拥有多个分隔符的方法。有什么想法吗？

Answer 1

我一开始很难理解这个问题，但后来仔细看了看你在做什么。我认为你过度复杂了。

$selectedCustomer = "John Doe";
$customers = array();
while($row = odbc_fetch_array($rs2)) {
    //get rid of trailing comma
    $customersString = rtrim($row['Customer'],',');
    //first populate an array with all the customers.
    foreach(explode(',', $customersString) as $customer)
        $customers[] = $customer; 
}
//now eliminate duplicates
$customers= array_unique($customers);
//now create the string with options
foreach($customers as $customer)
{
   $selected = trim($customer) == $selectedCustomer ? 'selected="selected" ': '';
   $CustomerData = '<option '.$selected.'>'.$customer.'</option>';
}

?>

通过这种方式，您首先获得客户然后加入标记，而不是试图以非常混乱的方式破坏/爆炸。希望这会有所帮助。

带阵列的多个分隔符

1 个答案: