Question

所以我是一个初学者，我正在开发一个项目来创建动态下拉表单。我写了一些代码，现在想知道我是否可以插入php＆amp; html里面有一个多行的php变量。下面这段代码就是我刚试过的[javascript不包含在这里]但是php显示错误。这根本不可能，还是我的错误？提前谢谢。

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>php & html inside a multi line php variable</title>
</head>
<body>
    <?php 
    $chooseroom=<<<HERE
    <div class="select-boxes">
        <?php
        //Include database configuration file
        include('dbConfig.php');

        //Get all occupation data
        $query = $db->query("SELECT * FROM occupations WHERE status = 1 ORDER BY occupation_name ASC");

        //Count total number of rows
        $rowCount = $query->num_rows;
        ?>
        <select name="occupation" id="occupation">
            <option value="">Select occupation</option>
            <?php
            if($rowCount > 0){
                while($row = $query->fetch_assoc()){ 
                    echo '<option value="'.$row['occupation_id'].'">'.$row['occupation_name'].'</option>';
                }
            }else{
                    echo '<option value="">occupation not available</option>';
                }
            ?>
        </select>

        <select name="specification" id="specification">
            <option value="">Select occupation first</option>
        </select>

        <select name="expertise" id="expertise">
            <option value="">Select specification first</option>
        </select>
    </div>
    HERE;
    echo $chooseroom;
</body>
</html>

好的，这是你的一些请求我的JAVASCRIPT：

<script src="jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#occupation').on('change',function(){
    var occupationID = $(this).val();
    if(occupationID){
        $.ajax({
            type:'POST',
            url:'ajaxData.php',
            data:'occupation_id='+occupationID,
            success:function(html){
                $('#specification').html(html);
                $('#expertise').html('<option value="">Select specification first</option>'); 
            }
        }); 
    }else{
        $('#specification').html('<option value="">Select occupation first</option>');
        $('#expertise').html('<option value="">Select specification first</option>'); 
    }
});

$('#specification').on('change',function(){
    var specificationID = $(this).val();
    if(specificationID){
        $.ajax({
            type:'POST',
            url:'ajaxData.php',
            data:'specification_id='+specificationID,
            success:function(html){
                $('#expertise').html(html);
            }
        }); 
    }else{
        $('#expertise').html('<option value="">Select specification first</option>'); 
    }
});
});
</script>

Answer 1

是的，可以将多行html和php添加到变量中。您可以在选项中添加多个条目，如下所示

while($row = $query->fetch_assoc()){

 /* here . operator is used to append
 to the existing value of $chooseroom */

$chooseroom .= '<option value="'.$row['occupatio_id'].'">'.$row['occpation_name'].'</option>';
}

将此变量打印到

所需的位置

<?php echo $chooseroom; ?>

Answer 2

你不能以你尝试的方式做你正在尝试的事情;您尝试做的是在HEREDOC块中运行PHP代码。

但是，您可以放置PHP代码，并在该块之前创建一组选项，并在需要的地方插入它（您甚至不需要将HEREDOC块分配给一个变量，你可以使用echo out out：

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>php & html inside a multi line php variable</title> </head> <body> <?php //Include database configuration file include('dbConfig.php'); //Get all occupation data $query = $db->query("SELECT * FROM occupations WHERE status = 1 ORDER BY occupation_name ASC"); //Count total number of rows $rowCount = $query->num_rows; // Create an HTML options string $htmlOptions = ""; if($rowCount > 0) { while($row = $query->fetch_assoc()){ $htmlOptions .= '<option value="'.$row['occupation_id'].'">'.$row['occupation_name'].'</option>'; } } else { $htmlOptions .= '<option value="">occupation not available</option>'; } // Output echo <<<HERE <div class="select-boxes"> <select name="occupation" id="occupation"> <option value="">Select occupation</option> $htmlOptions </select> <select name="specification" id="specification"> <option value="">Select occupation first</option> </select> <select name="expertise" id="expertise"> <option value="">Select specification first</option> </select> </div> HERE; ?> </body> </html>

虽然，老实说，HEREDOC的整个过程在某种程度上是多余的，因为你可以突破PHP并在你需要的地方回应你的选项 - 这样就可以在PHP和HTML代码之间略微更好地分离：

<?php //Include database configuration file include('dbConfig.php'); //Get all occupation data $query = $db->query("SELECT * FROM occupations WHERE status = 1 ORDER BY occupation_name ASC"); //Count total number of rows $rowCount = $query->num_rows; // Create an HTML options string $htmlOptions = ""; if($rowCount > 0) { while($row = $query->fetch_assoc()){ $htmlOptions .= '<option value="'.$row['occupation_id'].'">'.$row['occupation_name'].'</option>'; } } else { $htmlOptions .= '<option value="">occupation not available</option>'; } // OUTPUT ?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>php & html inside a multi line php variable</title> </head> <body> <div class="select-boxes"> <select name="occupation" id="occupation"> <option value="">Select occupation</option> <?= $htmlOptions; ?> </select> <select name="specification" id="specification"> <option value="">Select occupation first</option> </select> <select name="expertise" id="expertise"> <option value="">Select specification first</option> </select> </div> </body> </html>

Answer 3

我自己总是喜欢这个解决方案：

<?php

include('dbConfig.php');
$query = $db->query("SELECT * FROM occupations WHERE status = 1 ORDER BY occupation_name ASC");
$rowCount = $query->num_rows;

ob_start();

if ( $rowCount > 0 ) {

    while( $row = $query -> fetch_assoc() ){ 

        echo '<option value="'.$row['occupation_id'].'">'.$row['occupation_name'].'</option>';

    }

} else {

    echo '<option value="">occupation not available</option>';

}

$values = ob_get_clean();

?>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>php & html inside a multi line php variable</title>
</head>

<body>
<div class="select-boxes">
<select name="occupation" id="occupation">  
<option value="">Select occupation</option>     
<?php echo $values; ?>
</select>

<select name="specification" id="specification">
    <option value="">Select occupation first</option>
</select>

<select name="expertise" id="expertise">
    <option value="">Select specification first</option>
</select>
</div>
</body>
</html>

我可以插入php＆amp;多行php变量里面的html？

3 个答案: