我想有我的表单显示一个错误，不能通过时，有人没有正确进入一个字段，但如何 - I want to have my form show an error and not be able to pass when someone doesnt enter a field correctly, but how?

I want to have my form show an error and not be able to pass when someone doesnt enter a field correctly, but how?

表单在genericwebpage.html网页上

<form name = "quoted" form action = "genericwebpage.php" method="get">
<input id = "poster" type="text" name="poster" placeholder = "Credited Individual.">        <br>
<textarea class = "actual-quote" name = "actual-quote"placeholder = "Write the quote here!"></textarea><br><br>
<input id = "submit1" type="submit">
</form>

和这里的php，找到genericwebpage.php

<div class="wrapper">
<div class="submissions">
<div class="logo-logo"><h2>Generic.</h2></div>
<div class="top-submit"><?php echo $_GET['actual-quote']?></div>
<div class="poster"><?php echo $_GET['poster']?></div>
</div>

有人可以引导我到一个点，一个错误框将显示时，输入不完全，所以它不会提交?我看了教程，但似乎没有工作。

在需要的输入中

required="required"

在大多数现代浏览器中，

将停止提交并指出所需字段。对于更深入的响应，您将需要JavaScript。