我在JS上有这两个函数：
<script>
function inc(elem)
{
elem.value++;
}
function dec(elem)
{
if(elem.value>1)
{
elem.value--;
}
}
</script>
这个表单在html:中
<form method="POST" action= "tameio.php" >
<input type="hidden" value="0" id="counter" name="counter">
<input type = "submit" value = "NextPage" name = "submit" onClick="inc(document.getElementById('counter')); ">
<input type = "submit" value = "PreviousPage" name = "submit" onClick="dec(document.getElementById('counter'));">
</form>
这是php:
<?php
if(isset($_POST['submit']))
{
echo $_POST['counter'];
if($_POST['submit'] == 'NextPage'){
...
}
}
?>
所以问题是，在我点击下一页按钮后，0变为1，但它没有存储在表单中，所以它在html上再次变为0。如果我重新点击它，它将再次发送1。我应该使用ajax吗？
无需执行任何操作，
<form method="POST" action= "tameio.php" >
<input type="hidden" value="<?=$current_page?>" id="counter" name="counter">
<input type = "submit" value = "NextPage" name = "submit" onClick="inc(document.getElementById('counter')); ">
<input type = "submit" value = "PreviousPage" name = "submit" onClick="dec(document.getElementById('counter'));">
</form>
在PHP中：
<?php
if(isset($_POST['submit']))
{
if($_POST['submit'] == 'NextPage')
{
$current_page = $_POST['counter'] + 1;
} else {
$current_page = $_POST['counter'] - 1;
}
} else {
$current_page = 1;
}
// Fetch the page data based on the current page
...
?>>
但我建议你用GET而不是帖子来做这件事。
<a href="tamieo.php?page=<?=$current_page - 1?>">Previous Page</a> |
<a href="tamieo.php?page=<?=$current_page + 1?>">Next Page</a>
在PHP中：
<?php
if(isset($_GET['page']) && $_GET['page'] > 0)
$current_page = (int) $_GET['page'];
else
$current_page = 1;
这样尝试-
<script>
function inc(elem)
{
document.getElementById('counter').value = elem.value +1;
}
function dec(elem)
{
if(elem.value>1)
{
document.getElementById('counter').value = elem.value -1;
}
}
</script>