HTML表单被阻止，无法输入任何文本 - HTML form blocked, cannot enter any text

嗨，由于某种原因，我突然无法在html表单中输入任何文本。它以前工作过，现在不工作了。我一直在使用HTML、CSS和PHP编写数据库。有什么想法吗？我早些时候也遇到过这种情况，因为我把一些z值设置为-1或其他什么，但后来我解决了这个问题，现在不知怎么又发生了。

当我浏览表单时，我可以输入文本，但当我将鼠标悬停在文本区域上时，不会显示光标。

<form action="dashboard.php" method="post">
    <div class="label"><span>Date </span><input type='date' class="datefield" name='date' /></div>
    <div class="label"><span>Department </span><input type="text" class="department" name="dept" value="" /></div>
    <div class="label"><span>Severity </span>
        <select name='seve' class="selectfield1">
                <option value="priority">Select</option>
                <option value="urgent">Urgent</option>
                <option value="high">High</option>
                <option value="medium">Medium</option>
                <option value="low">Low</option>
        </select>
    </div>
    <div class="label"><span>Status </span>
        <select name='stat' class="selectfield2">
                <option value="status">Select</option>
                <option value="progress">In progress</option>
                <option value="assigned">Assigned</option>
                <option value="completed">Completed</option>
                <option value="Delayed">Delayed</option> 
        </select>
    </div>
   <div class="label"><span>Assigned To </span><input type="text" class="assignedto" name="assi" value="" /></div>
    <div class="label"><span>Due By </span><input type="datetime-local" class="dueby" name="dueby"></div>
    <div class="label"><span>Description </span><textarea name="desc" class="description"></textarea></div>
    <div><span>&nbsp;</span><input type="submit" name="submit" value="Log Incident" /></div>
</form>

和CSS

@import url(https://fonts.googleapis.com/css?family=Roboto:300); /* Here we import a font from Google's API in order to use it in our project as the default font. */
.form_heading{
font-family: "Roboto", sans-serif;
margin-bottom: 25px;
font-size: 25px;
padding-bottom: 7px; /* This block of CSS code designs the "Log Incidents" heading */
}
.dash_style {
position: relative;
top: 55px;
left: 200px;
}
.dash_style div{
display: block;
margin: 0px 0px 15px 0px; /* This block of CSS code decides on the spacing between all the boxes and their labels. */
}
.dash_style div > span{
width: 100px;
font-weight: bold;
float: left;
padding-top: ;
padding-right: 5px;
font-family: "Roboto", sans-serif; /* This block of CSS code designs the labels and decided how far away the boxes will be  */
}

.dash_style input.datefield{
width: 10%; /* This block of CSS code just changes the width of the data field box. */
}
.dash_style input.department, 
.dash_style input.assignedto,
.dash_style .input-field3,
.dash_style .selectfield
.dash_style .selectfield2{
box-sizing: border-box;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
border: 1px solid #C2C2C2;
box-shadow: 1px 1px 4px #EBEBEB;
-moz-box-shadow: 1px 1px 4px #EBEBEB;
-webkit-box-shadow: 1px 1px 4px #EBEBEB;
border-radius: 3px;
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
padding: 7px;
outline: none; /* This block of CSS code selects the different boxes by their specidied class and gives them a new look. */
}
.dash_style .description{
height:60px;
width: 20%; /* Here we decided how wide and tall the text area for the Incident Description will be */
}
.dash_style input[type=submit],
.dash_style input[type=button]{
border: none;
padding: 8px 15px 8px 15px;
width: 150px;
background: #336699;
color: #fff;
font-size: 15;
box-shadow: 1px 1px 4px #DADADA;
-moz-box-shadow: 1px 1px 4px #DADADA;
-webkit-box-shadow: 1px 1px 4px #DADADA;
border-radius: 3px;
-webkit-border-radius: 3px;
-moz-border-radius: 3px; /* This block of CSS code designs "Log Incident" button */
}
.dash_style input[type=submit]:hover,
.dash_style input[type=button]:hover{
background: #EA7B00;
color: #fff; /* The "Log Incident" button's background colour and hover effect are created here */
}

您可以通过右键单击所需元素并从上下文菜单中选择inspect element来自行解决此问题。

这将弹出开发者工具应用程序，该应用程序现在内置于Chrome、Firefox和Opera中（每一个都略有不同。例如，我更喜欢Chrome的开发工具）。

您将看到Elements选项卡和Styles窗格。请注意，您可以通过动态添加/禁用CSS进行实验非常有用的工具。

阅读这篇关于如何使用它的帖子，或者在YouTube上搜索视频：

https://developer.chrome.com/devtools

您会注意到，它在下面的堆栈代码段中运行良好。很可能，页面上的其他内容正在干扰您--并且您很可能使用z索引。

@import url(https://fonts.googleapis.com/css?family=Roboto:300); /* Here we import a font from Google's API in order to use it in our project as the default font. */
.form_heading{
  font-family: "Roboto", sans-serif;
  margin-bottom: 25px;
  font-size: 25px;
  padding-bottom: 7px; /* This block of CSS code designs the "Log Incidents" heading */
}
.dash_style {
  position: relative;
  top: 55px;
  left: 200px;
}
.dash_style div{
  display: block;
  margin: 0px 0px 15px 0px; /* This block of CSS code decides on the spacing between all the boxes and their labels. */
}
.dash_style div > span{
  width: 100px;
  font-weight: bold;
  float: left;
  padding-top: ;
  padding-right: 5px;
  font-family: "Roboto", sans-serif; /* This block of CSS code designs the labels and decided how far away the boxes will be  */
}
.dash_style input.datefield{
  width: 10%; /* This block of CSS code just changes the width of the data field box. */
}
.dash_style input.department, 
.dash_style input.assignedto,
.dash_style .input-field3,
.dash_style .selectfield
.dash_style .selectfield2{
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  border: 1px solid #C2C2C2;
  box-shadow: 1px 1px 4px #EBEBEB;
  -moz-box-shadow: 1px 1px 4px #EBEBEB;
  -webkit-box-shadow: 1px 1px 4px #EBEBEB;
  border-radius: 3px;
  -webkit-border-radius: 3px;
  -moz-border-radius: 3px;
  padding: 7px;
  outline: none; /* This block of CSS code selects the different boxes by their specidied class and gives them a new look. */
}
.dash_style .description{
  height:60px;
  width: 20%; /* Here we decided how wide and tall the text area for the Incident Description will be */
}
.dash_style input[type=submit],
.dash_style input[type=button]{
  border: none;
  padding: 8px 15px 8px 15px;
  width: 150px;
  background: #336699;
  color: #fff;
  font-size: 15;
  box-shadow: 1px 1px 4px #DADADA;
  -moz-box-shadow: 1px 1px 4px #DADADA;
  -webkit-box-shadow: 1px 1px 4px #DADADA;
  border-radius: 3px;
  -webkit-border-radius: 3px;
  -moz-border-radius: 3px; /* This block of CSS code designs "Log Incident" button */
}
.dash_style input[type=submit]:hover,
.dash_style input[type=button]:hover{
  background: #EA7B00;
  color: #fff; /* The "Log Incident" button's background colour and hover effect are created here */
}

<form action="dashboard.php" method="post">
  <div class="label"><span>Date </span><input type='date' class="datefield" name='date' /></div>
  <div class="label"><span>Department </span><input type="text" class="department" name="dept" value="" /></div>
  <div class="label"><span>Severity </span>
    <select name='seve' class="selectfield1">
      <option value="priority">Select</option>
      <option value="urgent">Urgent</option>
      <option value="high">High</option>
      <option value="medium">Medium</option>
      <option value="low">Low</option>
    </select>
  </div>
  <div class="label"><span>Status </span>
    <select name='stat' class="selectfield2">
      <option value="status">Select</option>
      <option value="progress">In progress</option>
      <option value="assigned">Assigned</option>
      <option value="completed">Completed</option>
      <option value="Delayed">Delayed</option> 
    </select>
  </div>
  <div class="label"><span>Assigned To </span><input type="text" class="assignedto" name="assi" value="" /></div>
  <div class="label"><span>Due By </span><input type="datetime-local" class="dueby" name="dueby"></div>
  <div class="label"><span>Description </span><textarea name="desc" class="description"></textarea></div>
  <div><span>&nbsp;</span><input type="submit" name="submit" value="Log Incident" /></div>
</form>