-6
可能重复:
How to prevent submitting the HTML form’s input field value if it empty防止用空输入提交表单?
<?php
include '../core/init.php';
if(isset($_POST['nt']) && isset($_POST['ntb'])){
mysql_query("INSERT INTO `post` (`myid`, `text`) VALUES ('".$_SESSION['id']."', '".mysql_real_escape_string($_POST['nt'])."')");
}
?>
<iframe style="display:none" name="submissiontarget" id="submissiontarget"></iframe>
<form method="post" target="submissiontarget" action = "../ajax/post.php" name="form">
<input type="textbox" name="nt" class="postwall" id="nt" placeholder="Post on your wall" rows="7" wrap="physical" cols="40" onfocus="if(this.value=='Post On Your Wall')this.value='';" onblur="if(this.value=='')this.value='Post On Your Wall';" />
<input type="submit" style="display:none;" name='ntb' id='ntb' class="Buttonchat" value="Post" />
</form>
我希望能够做到这一点,所以如果文本框为空,它说,“他们是在墙上的错误发帖,请再试一次'。
'if($ _POST ['nt'] ==“”){echo'error'; }' – sachleen
可能的重复[如何防止提交HTML表单的输入字段值,如果它为空](http://stackoverflow.com/questions/8029532/how-to-prevent-submitting-the-html-forms-input-字段值 - 如果它为空)(...或任何类似的问题在这里SO;例如http://stackoverflow.com/questions/10516122/how-prevent-submit-if-input-are-empty-with-javascript ) – feeela
不难研究简单网页搜索中的基本表单验证。在发布问题之前,至少要付出一点努力 – charlietfl