jquery onclick 函数未定义

Question

我有一个 ajax 脚本，我正在尝试从一个函数中发布。我正在使用 onlick href 但它没有出现未定义。这是使用wordpress。我试图在范围内外移动代码，但我似乎仍然无法让它工作。

    <div id="live">
    <div class="container">
        <?php the_content(); ?>
        <div id="comment-display">
            <form method="post" action="index.php" id="comments_submit">
                <input type="hidden" id="nameBox" value="<?php echo $_SESSION['name'] ?>" name="name"/>
                <input type="hidden" id="emailBox" name="email" value="<?php echo $_SESSION['email']; ?>"/>
                <textarea id="chatBox" placeholder="Ask a question or make a comment" name="comment" class="form-control"></textarea>
                <a href="javascript:submitComment();" type="submit" id="submit" name="submit" class="btn cardh-bg text-white text-bold margin-top-5"> Submit Comment </a>
            </form>
            <br />
            <div id="displayComments"></div>
        </div>
    </div>
</div>
<script type="text/javascript">
    jQuery(function($) {
        setInterval(function(){
            $.ajax({
                method: "GET",
                url: "<?php echo get_template_directory_uri()?>/get_chat.php"
            }).done(function(html){
                $('#displayComments').html(html);
            });
        }, 2000);

        function submitComment(){
            $.ajax({
                method: "POST",
                url: "template-live.php",
                data: {submitComment:$('#chatBox').val(),submitName:$('#nameBox').val(),submitEmail:$('#emailBox').val()}
            }).done(function(html){
                alert('Your comment has been submitted, and will be displayed after approval.');
                $('#chatBox').val('');
            });
        }
    });
</script>

谢谢你:)

Answer 1

当您执行javascript:submitComment() 时，这将调用全局函数submitComment。由于submitComment 是在jQuery(function($) { ... }) 函数中定义的，因此它不是全局的。因此，window.submitComment 是 undefined（因此是 undefined is not a function）。

全局变量存储在window 对象中。

因此，您可以将 submitComment 公开为全局：

window.submitComment = function () {...}

请注意，您应尽可能避免使用全局变量。在这种情况下，您可以通过添加：

$("#submit").click(submitComment);
// In this case, you shouldn't declare submitComment as a global anymore

由于您处于表单中，因此您希望在单击 a 元素时停止默认浏览器行为，方法是在函数末尾使用 return false。

Answer 2

替代@Ionică Bizău 的解决方案。

你可以用onclick="submitComment()"代替href。

<a onclick="submitComment()" type="submit" id="submit" name="submit" class="btn cardh-bg text-white text-bold margin-top-5"> Submit Comment </a>

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<div id="live">
  <div class="container">
    <?php the_content(); ?>
    <div id="comment-display">
      <form method="post" action="index.php" id="comments_submit">
        <input type="hidden" id="nameBox" value="<?php echo $_SESSION['name'] ?>" name="name" />
        <input type="hidden" id="emailBox" name="email" value="<?php echo $_SESSION['email']; ?>" />
        <textarea id="chatBox" placeholder="Ask a question or make a comment" name="comment" class="form-control"></textarea>
        <a onclick="submitComment()" type="submit" id="submit" name="submit" class="btn cardh-bg text-white text-bold margin-top-5"> Submit Comment </a>
      </form>
      <br />
      <div id="displayComments"></div>
    </div>
  </div>
</div>
<script type="text/javascript">
  jQuery(function($) {
    setInterval(function() {
      $.ajax({
        method: "GET",
        url: "<?php echo get_template_directory_uri()?>/get_chat.php"
      }).done(function(html) {
        $('#displayComments').html(html);
      });
    }, 2000);

    window.submitComment = function(){
      console.log('submitComment called!');
      $.ajax({
        method: "POST",
        url: "template-live.php",
        data: {
          submitComment: $('#chatBox').val(),
          submitName: $('#nameBox').val(),
          submitEmail: $('#emailBox').val()
        }
      }).done(function(html) {
        alert('Your comment has been submitted, and will be displayed after approval.');
        $('#chatBox').val('');
      });
    }
  });
</script>