HTML display = none不起作用

Question

My code: 我的代码：

<?php
  if($counter==0) {
    echo "value of counter = $counter"
  ?>
  <script type='text/javascript'>
    document.getElementById("tt").style.display = "none";
  </script>
  <?php
  }
?>
<html>
<body>
  <form action="new_upload.php" method="post" name="myform" enctype="multipart/form-data" id="formform">
    <input type='submit' value='Go Back!' name="sbmt" id="tt"
      <?php if($counter==0) { ?> display="none" <?php } ?> />
  </form>
  <p> Submit a different file by clicking the back button in case your file was unable to upload.</p>
</body>
</html>

You can see I have tried to set the property display=none of the submit button through 您可以看到我尝试通过以下方式将属性display = none设置为Submit按钮
1) if php condition is true, I added javascript. 1）如果php条件为true，则添加了javascript。
2) I added php in my form submit button code. 2）我在表单提交按钮代码中添加了php。
but it is not working both ways. 但它不能双向工作。 I can see through the print statement that the value of counter is 0 but then also it is visible. 我可以通过print语句看到counter的值为0，但是它也是可见的。

Answer 1

You are executing the script before the element is created. 您正在创建元素之前执行脚本。 Move the code below the element to work 将代码移到元素下方即可工作

Answer 2

没有display这样的属性，您需要改用style="display: none" 。

HTML display = none不起作用

问题描述

2 个解决方案

解决方案1
2

解决方案2
1 2017-10-22 11:51:53

HTML display = none不起作用

问题描述

2 个解决方案

解决方案1 2

解决方案2 1 2017-10-22 11:51:53

解决方案1
2

解决方案2
1 2017-10-22 11:51:53