drowdown列表值中的php未定义索引

伙计们！ 对php解析有一些问题。 代码如下：

<form method="POST" action="">
<input type="text" name="transactions">
<select name= "cat" class="cs-select cs-skin-border">
                <option value="" disabled selected>Select category</option>
                <option value="Aviabileti">Aviatickets</option>
                <option value="Oteli">Hotel</option>
                <option value="Krasota">Beauty</option>
                <option value="Odezhda_obyv">Clothes</option>
                <option value="Razvlecheniya">Amusement</option>
                <option value="Restorani">Restaurant</option>
                <option value="Telekom">Telecom</option>
                <option value="Toplivo">Fuel</option>
                <option value="ZhD_bileti">Railway tickets</option>
                <option value="Tyragenstva">Travel agencies</option>
                <option value="Dom_remont">House and repair</option>
                <option value="Foto_video">Foto and video</option>
</select>   
<input name="pointsinput" type="text">
<input type="text" name="destination">
<input type="text" name="cost">
 <label>
 <input type="Submit" name="submit" style="visibility:hidden"><span><
 img name = "gobut" src="go.png"></span>
 </label>
</form>

<?php
if (isset($_POST['submit'])) 
{ 
$trans=$_POST['transactions'];
$cat=$_POST['cat'];
$points = $_POST['pointsinput'];
$destination = $_POST['destination'];
$cost=$_POST['cost'];
echo $cat;
echo $destination;
echo $points;
echo $cost;
echo $trans;
}
?>

有一个php错误：未定义索引cat in…，但所有其他变量都显示正确。 如果我首先设置下拉列表，然后设置所有输入表单，它就可以正常工作

---

怎么了？

删除此行的禁用属性。正在禁用selectbox时。 所以，替换

 <option value="" disabled selected>Select category</option>

与

更改此行：-

<option value="" disabled selected>Select category</option>

到

要禁用，请使用以下选项：-

<select name="cat" class="cs-select cs-skin-border" disabled>

请尝试以下代码：-

<form method="POST" action="">
<input type="text" name="transactions">
<select name="cat" class="cs-select cs-skin-border">
                <option value="">Select category</option>
                <option value="Aviabileti">Aviatickets</option>
                <option value="Oteli">Hotel</option>
                <option value="Krasota">Beauty</option>
                <option value="Odezhda_obyv">Clothes</option>
                <option value="Razvlecheniya">Amusement</option>
                <option value="Restorani">Restaurant</option>
                <option value="Telekom">Telecom</option>
                <option value="Toplivo">Fuel</option>
                <option value="ZhD_bileti">Railway tickets</option>
                <option value="Tyragenstva">Travel agencies</option>
                <option value="Dom_remont">House and repair</option>
                <option value="Foto_video">Foto and video</option>
</select>   
<input name="pointsinput" type="text">
<input type="text" name="destination">
<input type="text" name="cost">
 <label>
 <input type="Submit" name="submit" style="visibility:hidden"><span>
 <img name = "gobut" src="go.png"></span>
 </label>
</form>

<?php
if (isset($_POST['submit'])) 
{ 
//print_r($_POST);//die;
$trans=$_POST['transactions'];
if(!empty($_POST['cat'])){
$cat=$_POST['cat'];
}else{
 $cat="category not select";       
}
$points = $_POST['pointsinput'];
$destination = $_POST['destination'];
$cost=$_POST['cost'];
echo $cat."<br>";
echo $destination."<br>";
echo $points."<br>";
echo $cost."<br>";
echo $trans."<br>";
}
?>

---

我无法复制这个。您确实有一个更新类型：

<form method="POST" action="">
<input type="text" name="transactions">
<select name="cat" id="cat" class="cs-select cs-skin-border">
                <option value="" disabled selected>Select category</option>
                <option value="Aviabileti">Aviatickets</option>
                <option value="Oteli">Hotel</option>
                <option value="Krasota">Beauty</option>
                <option value="Odezhda_obyv">Clothes</option>
                <option value="Razvlecheniya">Amusement</option>
                <option value="Restorani">Restaurant</option>
                <option value="Telekom">Telecom</option>
                <option value="Toplivo">Fuel</option>
                <option value="ZhD_bileti">Railway tickets</option>
                <option value="Tyragenstva">Travel agencies</option>
                <option value="Dom_remont">House and repair</option>
                <option value="Foto_video">Foto and video</option>
</select>   
<input name="pointsinput" type="text">
<input type="text" name="destination">
<input type="text" name="cost">
 <label>
 <input type="Submit" name="submit" style="visibility:hidden"><span onclick="return checkCat();">
 <img name = "gobut" src="go.png"></span>
 </label>
</form>

<script>
function checkCat() {
var oS = document.getElementById("cat");
if (oS.options[oS.selectedIndex].value == "") {
    alert('CAT EMPTY PLEASE SELECT');
    return false;
}
}
</script>
<?php
if (isset($_POST['submit'])) 
{ 
$trans=$_POST['transactions'];
$cat=$_POST['cat'];
$points = $_POST['pointsinput'];
$destination = $_POST['destination'];
$cost=$_POST['cost'];
echo $cat;
echo $destination;
echo $points;
echo $cost;
echo $trans;
}
?>

---

这将解决您的问题

您的代码工作正常。我测试过了

<form method="POST" action="">
<input type="text" name="transactions">

<input name="pointsinput" type="text">
<input type="text" name="destination">
<input type="text" name="cost">
 <select name= "cat" class="cs-select cs-skin-border">
                <option value="" disabled selected>Select category</option>
                <option value="Aviabileti">Aviatickets</option>
                <option value="Oteli">Hotel</option>
                <option value="Krasota">Beauty</option>
                <option value="Odezhda_obyv">Clothes</option>
                <option value="Razvlecheniya">Amusement</option>
                <option value="Restorani">Restaurant</option>
                <option value="Telekom">Telecom</option>
                <option value="Toplivo">Fuel</option>
                <option value="ZhD_bileti">Railway tickets</option>
                <option value="Tyragenstva">Travel agencies</option>
                <option value="Dom_remont">House and repair</option>
                <option value="Foto_video">Foto and video</option>
</select>  
 <label>
 <input type="Submit" name="submit" ><span>
 <img name = "gobut" src="go.png"></span>
 </label>

</form>

<?php
if (isset($_POST['submit'])) 
{ 
$trans=$_POST['transactions'];
$cat=$_POST['cat'];
$points = $_POST['pointsinput'];
$destination = $_POST['destination'];
$cost=$_POST['cost'];
echo $cat;
echo $destination;
echo $points;
echo $cost;
}
?>

---

echo$cat是否显示某些内容？但我在html中选择了它page@Erlaunis他在分配给$cat的行上得到了错误。@Barmar好的，我没有看到错误assignation@Erlaunis你看到错误信息了吗？它说的是未定义的索引，不是未定义的变量。为什么？在下拉菜单中有这样的提示选项是正常的。也许他应该删除禁用的属性。@Danielgurin请检查我更新的答案，并让我知道您的确切要求。@Sandepsure我只需要将输入表单中的所有值放入并选择表单到php变量，以便进一步使用it@sandeepsure你注意到了吗，我说过的位置？@sandepsure当选择表单是所有输入表单中的第一个时，它会工作！空的$_POST['cat']{$cat=$_POST['cat']}否则{$cat=category disabled；}试试这个@danielgurinahutos，我已经禁用了category stringrahutos，我在网页上选择了它，但它没有被选中，这是个问题愤怒，我在我的html页面上选择了它，但它不起作用如果你想要一个肮脏的解决方案，你可以把它放在上面，如果这解决了你的问题，请勾选正确答案。

<form method="POST" action="">
<input type="text" name="transactions">
<select name="cat" id="cat" class="cs-select cs-skin-border">
                <option value="" disabled selected>Select category</option>
                <option value="Aviabileti">Aviatickets</option>
                <option value="Oteli">Hotel</option>
                <option value="Krasota">Beauty</option>
                <option value="Odezhda_obyv">Clothes</option>
                <option value="Razvlecheniya">Amusement</option>
                <option value="Restorani">Restaurant</option>
                <option value="Telekom">Telecom</option>
                <option value="Toplivo">Fuel</option>
                <option value="ZhD_bileti">Railway tickets</option>
                <option value="Tyragenstva">Travel agencies</option>
                <option value="Dom_remont">House and repair</option>
                <option value="Foto_video">Foto and video</option>
</select>   
<input name="pointsinput" type="text">
<input type="text" name="destination">
<input type="text" name="cost">
 <label>
 <input type="Submit" name="submit" style="visibility:hidden"><span onclick="return checkCat();">
 <img name = "gobut" src="go.png"></span>
 </label>
</form>

<script>
function checkCat() {
var oS = document.getElementById("cat");
if (oS.options[oS.selectedIndex].value == "") {
    alert('CAT EMPTY PLEASE SELECT');
    return false;
}
}
</script>
<?php
if (isset($_POST['submit'])) 
{ 
$trans=$_POST['transactions'];
$cat=$_POST['cat'];
$points = $_POST['pointsinput'];
$destination = $_POST['destination'];
$cost=$_POST['cost'];
echo $cat;
echo $destination;
echo $points;
echo $cost;
echo $trans;
}
?>

<form method="POST" action="">
<input type="text" name="transactions">

<input name="pointsinput" type="text">
<input type="text" name="destination">
<input type="text" name="cost">
 <select name= "cat" class="cs-select cs-skin-border">
                <option value="" disabled selected>Select category</option>
                <option value="Aviabileti">Aviatickets</option>
                <option value="Oteli">Hotel</option>
                <option value="Krasota">Beauty</option>
                <option value="Odezhda_obyv">Clothes</option>
                <option value="Razvlecheniya">Amusement</option>
                <option value="Restorani">Restaurant</option>
                <option value="Telekom">Telecom</option>
                <option value="Toplivo">Fuel</option>
                <option value="ZhD_bileti">Railway tickets</option>
                <option value="Tyragenstva">Travel agencies</option>
                <option value="Dom_remont">House and repair</option>
                <option value="Foto_video">Foto and video</option>
</select>  
 <label>
 <input type="Submit" name="submit" ><span>
 <img name = "gobut" src="go.png"></span>
 </label>

</form>

<?php
if (isset($_POST['submit'])) 
{ 
$trans=$_POST['transactions'];
$cat=$_POST['cat'];
$points = $_POST['pointsinput'];
$destination = $_POST['destination'];
$cost=$_POST['cost'];
echo $cat;
echo $destination;
echo $points;
echo $cost;
}
?>