Php 发生onClick事件时如何从数据库填充文本框
我希望我的php文件根据select box标记的选定值用数据库中的信息填充文本框。每次选择更改时，文本框都应相应地重新填充 问题是，当我调用包含php代码的javascript方法时，页面被重新加载，并且当页面第一次加载时，Php 发生onClick事件时如何从数据库填充文本框,php,arrays,Php,Arrays,我希望我的php文件根据select box标记的选定值用数据库中的信息填充文本框。每次选择更改时，文本框都应相应地重新填充 问题是，当我调用包含php代码的javascript方法时，页面被重新加载，并且当页面第一次加载时，$\u POST[]收集的一些初始值丢失 我想找到一种方法，即使在页面重新执行php之后，$\u post[]收集的初始值也能得到保存。我怎样才能解决这个问题 <script type="text/javascript"> function displaymes
$\u POST[]$\u post[]<script type="text/javascript">
function displaymessagespatient()
{
<?php
function docmsg()
{
$title = $_POST["title"];
$conn=mysqli_connect("localhost","root","","askthedoctor");
$sql1="select patient_text from messages where title='".$title."';";
$sql2="select doctor_text from messages where title='".$title."';";
$result1=mysqli_query($conn,$sql1);
$result2=mysqli_query($conn,$sql2);
$row1=mysqli_fetch_array($result1);
$row2=mysqli_fetch_array($result2);
return $row1[0];
}
function patmsg()
{
$title = $_POST["title"];
$conn=mysqli_connect("localhost","root","","askthedoctor");
$sql1="select patient_text from messages where title='".$title."';";
$sql2="select doctor_text from messages where title='".$title."';";
$result1=mysqli_query($conn,$sql1);
$result2=mysqli_query($conn,$sql2);
$row1=mysqli_fetch_array($result1);
$row2=mysqli_fetch_array($result2);
return $row2[0];
}
?>
document.getElementById("answer").innerHTML=docmsg();
document.getElementById("question").innerHTML=patmsg();
}
</script>
</head>
<body>
<?php
if( isset($_POST['username']))
{
$username=$_POST["username"];
$password=$_POST["password"];
$password=md5($password);
$conn=mysqli_connect("localhost","root","","askthedoctor");
$sql="select password from login where username='".$username."';";
$result=mysqli_query($conn,$sql);
$row=mysqli_fetch_array($result);
if($row[0]!=$password)
{
echo "The username or password that you entered are incorrect!";
echo "<br/>";
echo "<a href=\"project_login.php\">Go back to login</a>";
die();
}
$sql1="select userprivileges from login where username='".$username."';";
$sql2="select image_path from registration1 where id=(select id from login where username='".$username."');";
$result1=mysqli_query($conn,$sql1);
$result2=mysqli_query($conn,$sql2);
$row1=mysqli_fetch_array($result1);
$row2=mysqli_fetch_array($result2);
$imagepath=$row2[0];
}
if($row1[0]==2)
{
?>
<form id="patient" method="POST" enctype="multipart/form-data" action="login.php" >
函数displayMessageSpatialent（）
{
我建议你重新考虑你的方法。对于这种类型的事情，我使用ajax，让javascript在需要时联系单独的php页面获取数据库信息。然后javascript可以整理数据并将其排列到html中。这意味着该页面不需要重新加载，而且速度更快，外观更好，而且你拥有的内容也没有问题有问题。这不起作用，因为你正在混合javascript和PHP。你需要一个PHP文件来通过ajax将内容返回到javascript。PHP只向客户端输出服务器计算。然后它完成执行。ajax将再次运行PHP，获得结果并完成工作在internet上查找一些ajax教程，有成千上万的em:）
<div id="header" class="class_header">
<a href="project_login.php" align="right" color="white">Sign Out</a>
</div>
<div id="body" >
<br/>
<table class="table">
<tr>
<td><font color="white" ><h1 color="white" style="font-size:200%;" align="center">Welcome <?php echo $username;?></h1></font></td>
<td> <div id="box"><image height="65px" width="65px" src="<?php echo $imagepath; ?>"></div></td>
<tr>
</table>
</div>
<div id="separator" ></div>
<div id="separator" ></div>
<div id="bodyy" style="height: 60%; width: 60%;" class="div">
<br/><br/><br/>
<fieldset id="registration">
<table class="table">
<tr>
<th>Messages</th>
<?php
$sql="select title from messages where paitient_id=(select id from login where username='".$username."');";
$result=mysqli_query($conn,$sql);
while($row=mysqli_fetch_array($result))
{
?>
<th>Problem Description</th>
<th>Doctor's Answer</th>
<th></th>
</tr>
<tr>
<td><select name="title">
<?php echo "<option value=\"mesazhi1\">".$row[0]."</option>";}?>
</select>
</td>
<td><textarea rows="4" col="50" id ="question" readonly> </textarea></td>
<td><textarea rows="4" col="50" id ="answer" readonly> </textarea></td>
</tr>
<tr>
<td></td>
</tr>
<tr>
<td><input type="submit" name="openmessage" value="Display Selected Message" onClick="displaymessagespatient()"></td>
<td><input type="button" name="btnSubmit" value="Ask a new question" ></td>
</tr>
</table>
</fieldset>
</div>
</div>
</form>
<?php } ?>
</body>