Php 当用户未在搜索框中输入任何内容时,不执行任何操作
当用户未在搜索框中输入任何内容时,如何使页面不执行任何操作 当搜索框中没有任何内容时,我希望页面保持不变 我该怎么做 这是我当前的代码:Php 当用户未在搜索框中输入任何内容时,不执行任何操作,php,search-engine,Php,Search Engine,当用户未在搜索框中输入任何内容时,如何使页面不执行任何操作 当搜索框中没有任何内容时,我希望页面保持不变 我该怎么做 这是我当前的代码: <html> <head> <title> Brandon's Search Engine </title> </head> <script type="text/javascript"> /
<html>
<head>
<title>
Brandon's Search Engine
</title>
</head>
<script type="text/javascript">
//document.getElementById("suggestion")
function getSuggestion(q) {
var ajax;
if(window.XMLHttpRequest)//for ie7+, FF, Chrome
ajax = new XMLHttpRequest();//ajax object
else
ajax = new ActiveXObject("Microsoft.XMLHTTP");//for ie6 and previous
ajax.onreadystatechange = function() {
if(ajax.status === 200 && ajax.readyState === 4) {
//if result are not there then don't display them
if(ajax.responseText === "")
document.getElementById("suggestion").style.visibility = "hidden";
else {
document.getElementById("suggestion").style.visibility = "visible";
document.getElementById("suggestion").innerHTML = ajax.responseText;
}
}
};
ajax.open("GET", "suggestion.php?q=" + q, false);
ajax.send();
}
</script>
<body>
<form method="GET" action="search.php" name="q">
<table align="center">
<tr>
<td>
<h1><center>Brandon's Search Engine</center></h1>
</td>
</tr>
<tr>
<td align="center">
<input type="text" name="q" style="height: 27px; width: 650px; padding: 2px"
onkeyup="getSuggestion(this.value)" autocomplete="off" onblur="blur() document.getElementById('suggestion').style.visibility = 'hidden'"/>
<div id="suggestion" style="width: 648px">
</div>
</td>
</tr>
<tr>
<td align="center">
<input type="submit" name="submit" value="Search" style="height: auto; width: 60px; padding: 2px" />
<input type="reset" value="Clear" style="height: auto; width: 50px; padding: 2px" />
</td>
</tr>
<tr>
<td align="center">
To insert your site in result fill in the form at <a href="insert.php">here</a>.
</td>
</tr>
</table>
<input type="hidden" name="page" value="0" />
</form>
</body>
</html>
您应该验证您的表单,如:
<form method="GET" action="search.php" name="q" onsubmit="return validateForm()">
您可以在表单提交功能上执行此操作,如: 您的表单如下所示:
<form method="GET" action="search.php" name="q" id="searchForm">
$("#searchForm").submit(function(e) {
if($("#q").val() == '')
{
e.preventDefault();
}
});
顺便说一下,此解决方案使用JQuery。您只需向表单元素添加一个id属性,并向搜索输入字段添加一个id属性。然后将此脚本添加到页面中的任何脚本标记中。
$("#searchForm").submit(function(e) {
if($("#q").val() == '')
{
e.preventDefault();
}
});