douduoyan5943 2019-07-12 14:09
浏览 134
已采纳

JQuery和PHP按Enter键进行处理

I have the following two files request.php and response.php. I used to send the request using a button 

    <input type="button" value="Request message" onclick="post()"/>

but now I and considering using just the "Enter"(13) key.

The code works, however it shows the result just for a couple of milliseconds. In theory keydown function is working and getting the result from response, bt I dont know why just for a very short time.

Any tips?

request.php

<script type="text/javascript">

function post(){
$("#message").keydown(function (e) {
    if (e.keyCode == 13) {
    var message=document.getElementById("message").value;
    $.post('response.php',{postmessage:message},
    function(data){
    var result = $('#post_message').html(data);
    console
return result; });
    }
});
}
</script>

<form>
Enter Message:<input type="text" id="message" name="message" onclick="post()"/><br/>
</form>
<div id="post_message"></div>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
</head>

response.php

<?php
 function returnString() {
    $post_msg = $_POST['postmessage'];
    echo "Message entered ->", $post_msg ," <- here";
}
returnString();
?>
  • 写回答

3条回答 默认 最新

  • duanou1904 2019-07-12 14:27
    关注

    You are trying to mimic behavior that is already available by default with a form that only has one input.

    Thus your form is submitting and reloading the page.

    You don't need to listen to key event on the <input>. Just listen for the submit event of the form and prevent the default submit process

    $('form').submit(function(e){
    e.preventDefault();    
    var msg = $('#message').val();

    mockPost(msg).then(function(res){        
      $('#post_message').append('<p>' + res + '<p>')
    });    

})


function mockPost(v){
   return new Promise(function(resolve){
        setTimeout(function(){
          resolve('Message= ' + v)
        }, 200)
   })
}
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
Enter Message:<input type="text" id="message" name="message"/><br/>
</form>
<div id="post_message"></div>

    </div>
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(2条)

报告相同问题？

悬赏问题

  • ¥15 eda：门禁系统设计
  • ¥50 如何使用js去调用vscode-js-debugger的方法去调试网页
  • ¥15 376.1电表主站通信协议下发指令全被否认问题
  • ¥15 物体双站RCS和其组成阵列后的双站RCS关系验证
  • ¥15 复杂网络，变滞后传递熵，FDA
  • ¥20 csv格式数据集预处理及模型选择
  • ¥15 部分网页页面无法显示！
  • ¥15 怎样解决power bi 中设置管理聚合，详细信息表和详细信息列显示灰色，而不能选择相应的内容呢？
  • ¥15 QTOF MSE数据分析
  • ¥15 平板录音机录音问题解决