将PHP数组传递到JavaScript中进行循环

如何解决将PHP数组传递到JavaScript中进行循环

我正在尝试将一些值从PHP数组传递到JavaScript。

我的php变量$contacts_info具有以下值。

Array ( [0] => Array ( [contact_id] => 20 [type_id] => 2 [contact_type] => Representative Phone [contact_value] => 0987654321 )
        [1] => Array ( [contact_id] => 21 [type_id] => 4 [contact_type] => Shop Address [contact_value] => 0987654321 ) 
        [2] => Array ( [contact_id] => 22 [type_id] => 3 [contact_type] => Emergency Phone [contact_value] => 0987654321 ) 
        [3] => Array ( [contact_id] => 23 [type_id] => 2 [contact_type] => Representative Phone [contact_value] => 0987654321 ) 
        [4] => Array ( [contact_id] => 24 [type_id] => 3 [contact_type] => Emergency Phone [contact_value] => 0987654321 ) 
        [5] => Array ( [contact_id] => 25 [type_id] => 4 [contact_type] => Shop Address [contact_value] => 0987654321 ) ) 1

我正在尝试通过JavaScript使用for循环在某些组合框中分配特定值。但是我这样做有问题。

Type: ParseError

Message: syntax error,unexpected '<',expecting ']'

我的JavaScript代码：

<script>
    var total_counter = "<?php echo $total_contact; ?>";
    var contact_info = "<?php json_encode($contacts_info); ?>";
    for (var i = 0; i <= total_counter - 1; i++) {
        let element = document.getElementById("contact_type_id_" + i);
        element.value = "<?php echo $contacts_info[<script>document.writeln(i);</script>]['type_id'] ?>";
    }
</script>

问题出在这部分<?php echo $contacts_info[<script>document.writeln(i);</script>]['type_id'] ?>中。谁能帮助我。

谢谢。

解决方法

请执行以下操作

1. 您需要删除用双引号引起来的PHP脚本，因为""将其视为字符串。

2. <?php echo json_encode($contacts_info); ?>丢失了echo，因为未回显JSON数组，因此可以将其分配给javascript变量contact_info

3. 变量contact_info已经具有您的JSON数组，无需再次从PHP变量中获取它，

最终，您的代码应该看起来像

 <script>
        var total_counter = <?php echo $total_contact; ?>;
        var contact_info = <?php echo json_encode($contacts_info); ?>;
        for (var i = 0; i <= total_counter - 1; i++) {
            let element = document.getElementById("contact_type_id_" + i);
            element.value = contact_info[i].type_id ;
        }
    </script>