php - 除非隐藏，否则在执行 php 时启用面板

Question

我使用 php 将结果显示到我的页面，我使用 bootstrap 做了一些样式设置

<div class="alert alert-success" role="alert">
        <?php    
        if(isset($_POST['submit'])){ //check if form was submitted
         include "assets/backend/newsletter.php";
        }
        ?>
</div>

即使没有执行 php 代码，我也能看到空白面板。 我怎样才能摆脱它？

Answer 1

[图片供引用。][1]我认为在你的情况下，这比你在上面做什么更有意义:

<?php    
if(isset($_POST['submit'])){ ?>
 <div class="alert alert-success" role="alert">  
 <?php include "assets/backend/newsletter.php"; ?>
</div>
<?php}?>

这样，如果表单已提交，面板将显示，如果未提交，面板将不可见。

footer.php
 <div class="container">
    <div class="row">
    <?php    
       if(isset($_POST['submit'])){
           echo '<div class="alert alert-success" role="alert"> ';
           include 'assets/backend/newsletter.php';
           echo '</div>';
       }
        ?>
    </div>

<div class="container-fluid" style="background-color:#222222">
    <div class="row">
        <div class="container" style="margin-top:15px;
            margin-bottom:15px">
            <div class="col-lg-4" style="color:#f3f6f9">
                <img src="images/pc%20logo.png" width="80px" height="80px">
                <h4 >
                    PLACEMENT  
                    <cell style="font-weight:bold">CELL</cell>
                </h4>
                <p>Nehru Nagar, Ring Road <br>New Delhi <br>
                    Ph :(+91) 964 328 0581<br>
                    Email : placements.pgdav@gmail.com
                </p>
                <a href="https://www.facebook.com/pgdavplacements">  <img src="images/f.png" height="30px" width="30px" >
                </a>
                <img src="images/i.png" height="30px" width="30px">
                <img src="images/linkedin.png" height="30px" width="30px">
            </div>
            <div class="col-lg-4" style="color:#f3f6f9;
                padding-top:30px">
                <h4>Subscribe to Our Newsletter</h4>
                <form action=" " method="post">
                    <div class="form-group">
                        <input class="form-control" type="text"
                            id="inputemail" name="email_newsletter" placeholder="Your Email ID">
                    </div>
                    <input type="submit" name="submit" class="btn btn-default" value="subscribe">
                </form>
            </div>
            <div class="col-lg-4" style="color:#f3f6f9;
                padding-top:29px">
                <h4>Links</h4>
                <ol class="breadcrumb">
                    <li><a href="index.php">Home</a></li>
                    <li><a href="aboutcell.php">About Cell</a></li>
                    <li><a href="">Registration</a></li>
                    <li><a href="contactus.php">Contact Us</a></li>
                </ol>
            </div>
        </div>

        <div class="container-fluid" style="background-color:#f3f6f9">
            <div class="row">
                <div class="container" style="padding-top:7px">
                    <div class="col-lg-6 col-sm-12 col-xs-12">© All the Rights Reserved with Placement Cell</div>
                    <div class="col-lg-6 col-sm-12 col-xs-12" style="text-align:right"><a href="https://www.linkedin.com/in/bhanukrsingh/">Developed By Bhanu Singh</a></div>
                </div>
            </div>
        </div>
    </div>
</div></div>

或者这个:

 <div class="container">
    <div class="row">
    <?php    
       if(isset($_POST['submit'])){ ?>
         <div class="alert alert-success" role="alert"> 
          <?php 
           include 'assets/backend/newsletter.php';
           ?>
           </div>
       <?php
       }
        ?>
    </div>

<div class="container-fluid" style="background-color:#222222">
    <div class="row">
        <div class="container" style="margin-top:15px;
            margin-bottom:15px">
            <div class="col-lg-4" style="color:#f3f6f9">
                <img src="images/pc%20logo.png" width="80px" height="80px">
                <h4 >
                    PLACEMENT  
                    <cell style="font-weight:bold">CELL</cell>
                </h4>
                <p>Nehru Nagar, Ring Road <br>New Delhi <br>
                    Ph :(+91) 964 328 0581<br>
                    Email : placements.pgdav@gmail.com
                </p>
                <a href="https://www.facebook.com/pgdavplacements">  <img src="images/f.png" height="30px" width="30px" >
                </a>
                <img src="images/i.png" height="30px" width="30px">
                <img src="images/linkedin.png" height="30px" width="30px">
            </div>
            <div class="col-lg-4" style="color:#f3f6f9;
                padding-top:30px">
                <h4>Subscribe to Our Newsletter</h4>
                <form action=" " method="post">
                    <div class="form-group">
                        <input class="form-control" type="text"
                            id="inputemail" name="email_newsletter" placeholder="Your Email ID">
                    </div>
                    <input type="submit" name="submit" class="btn btn-default" value="subscribe">
                </form>
            </div>
            <div class="col-lg-4" style="color:#f3f6f9;
                padding-top:29px">
                <h4>Links</h4>
                <ol class="breadcrumb">
                    <li><a href="index.php">Home</a></li>
                    <li><a href="aboutcell.php">About Cell</a></li>
                    <li><a href="">Registration</a></li>
                    <li><a href="contactus.php">Contact Us</a></li>
                </ol>
            </div>
        </div>

        <div class="container-fluid" style="background-color:#f3f6f9">
            <div class="row">
                <div class="container" style="padding-top:7px">
                    <div class="col-lg-6 col-sm-12 col-xs-12">© All the Rights Reserved with Placement Cell</div>
                    <div class="col-lg-6 col-sm-12 col-xs-12" style="text-align:right"><a href="https://www.linkedin.com/in/bhanukrsingh/">Developed By Bhanu Singh</a></div>
                </div>
            </div>
        </div>
    </div>
</div></div>

测试了两个选项都有效；