我知道这可能会被认为是离题的，但我不确定还能在哪里发布这篇文章，因为它也涉及WordPress以及插件联系人表单7。如果你知道我应该把这个贴在哪里而不是这里，请告诉我。

我希望有一个有条件的必填字段。我已经找到了可以使用的代码，但我觉得我自己很困惑，需要一些外部视角。

我需要做的是，如果我的复选框被选中为“是”，它将使其旁边的下拉列表成为必需的，如果复选框被选中为“否”，则不需要。

这是我的表单，在后端有短代码：

If you have ordered from us in the past, do you already work with one of our outside sales representatives?
[checkbox* check-sales id:checksales "Yes" "No"]

If you checked "Yes" which representative do you generally deal with?
[select sales-rep id:sales include_blank "Marla" "Lisa" "Wendy" "Stacy" "Nicole" "Linda" "Jody" "Gisele" "Ray" "Craig"]

[submit]

下面是进入函数的php代码示例。php文件。

function is_gmail($email) {  
      if(substr($email, -10) == \'@gmail.com\') {  
           return true;  
      } else {  
           return false;  
      };  
 };  
 function custom_email_validation_filter($result, $tag) {  
      $type = $tag[\'type\'];  
      $name = $tag[\'name\'];  
      if($name == \'your-email\') { // Only apply to fields with the form field name of "your-email"  
           $the_value = $_POST[$name];  
           if(!is_gmail($the_value)){  
                $result[\'valid\'] = false;  
                $result[\'reason\'][$name] = \'This is not a gmail address!\'; // Error message  
           };  
      };  
       return $result;  
 };  
 add_filter(\'wpcf7_validate_email\',\'custom_email_validation_filter\', 10, 2); // Email field  
 add_filter(\'wpcf7_validate_email*\', \'custom_email_validation_filter\', 10, 2); // Required Email field 

我知道这是为了检查电子邮件。然而，我让自己困惑的是，为了使复选框和下拉列表能够工作，我需要更改什么。

<script type="text/javascript">
/*! jQuery script to hide certain form fields */
$(document).ready(function () {

    //Hide the field initially
    $("#hide").hide();

    //Show the text field only when the third option is chosen
    $(\'#dropdown\').change(function () {
        if ($("#dropdown").val() == "Other") {
            $("#hide").show();
            var input = $("#hide");
            if (input.length > 0) { //If the input field contains any value remove it
                input.val(\'\');
            }

        } else {
            $("#hide").hide();
            var input = $("#hide");
            input.val("NA"); //add NA Value to hidden field that is required!

        }
    });
});
</script>

function my_custom_conditional_required($result, $tag) {
    $tag = new WPCF7_Shortcode( $tag );
    $name = $tag->name;
    $value = isset( $_POST[$name] )
        ? trim( wp_unslash( strtr( (string) $_POST[$name], "\\n", " " ) ) )
        : \'\';

    $myCheckbox= $_POST[\'myCheckbox\'][0];

    if( $name == "address" && $myCheckbox== true){
        if ( \'\' == $value ) :
            $result->invalidate( $tag, \'Address is required.\' );
         endif;
    }

    return $result;
}

add_filter( \'wpcf7_validate_text\', \'my_custom_conditional_required\', 10, 2 );
add_filter( \'wpcf7_validate_text*\', \'my_custom_conditional_required\', 10, 2 );