[英]How to keep checked state of checkbox after submit or page refresh in php?
[英]PHP array checkbox issue, keep the 'right' boxes checked after submit
我目前正在基於數組中的每個學校創建一個復選框系統。 一切正常,除了在提交后僅選中第一個復選框。 示例:我有10個復選框,復選框編號為4,5和6。提交后,選中了復選框1,2和3。 我希望方框4,5和6在提交后保留其選擇。 希望您能通過問題想象。
<!--Start Checkbox system for schools-->
<form method="POST">
<?php
$q = "SELECT id, name FROM $school_table";
$result = mysqli_query($con, $q);
while(($row = mysqli_fetch_array($result))) {
//First line of <input>
echo '<input type="checkbox" name="check_list[]" value="';
//Value of the input (school ID)
echo $row['id'] .'"';
//Keep the box checked after submit. PROBLEM MIGHT BE HERE!!!
if(isset($_POST['check_list'][$row['id']])){echo 'checked="checked"';}
//Echos the school name out after the checkbox.
echo '>' . $row['name'] . " <br> ";
}
?>
<script language="javascript">
//Select all on/off function
function checkAll(bx) {
var cbs = document.getElementsByTagName('input');
for(var i=0; i < cbs.length; i++) {
if(cbs[i].type == 'checkbox') {
cbs[i].checked = bx.checked;
}
}
}
</script>
<!--Check all mark. Works with Javascript written above-->
<input type="checkbox" name="check_all" onclick="checkAll(this)" <?php if(isset($_POST['check_all'])){echo "checked";} ?>> Check all: On/Off
<input type="submit" name="submit" value="sort">
</form>
<!--End Checkbox system for schools-->
希望你們能幫助我:)
我沒有您的MySQL,因此我通過使用for循環創建一些行來模擬它。
<html>
<!--Start Checkbox system for schools-->
<head>
<title>Test checklist</title>
</head>
<body>
<form method="POST">
<?php
for ($i = 0; $i < 10; $i++) {
$rows[$i]['id'] = $i*2+1;
$rows[$i]['name'] = "Name ".strval($i*2+1);
}
// $q = "SELECT id, name FROM $school_table";
//$result = mysqli_query($con, $q);
//while(($row = mysqli_fetch_array($result))) {
foreach ( $rows as $row )
{
//First line of <input>
echo '<input type="checkbox" name="check_list['.$row['id'].']" value="checked"';
//Keep the box checked after submit. PROBLEM MIGHT BE HERE!!!
if(isset($_POST['check_list'][strval($row['id'])])){
echo 'checked="checked"';}
//Echos the school name out after the checkbox.
echo '>' . $row['name'] . " <br>\n";
}
?>
<script language="javascript">
//Select all on/off function
function checkAll(bx)
{
var cbs = document.getElementsByTagName('input');
for(var i=0; i < cbs.length; i++) {
if(cbs[i].type == 'checkbox') {
cbs[i].checked = bx.checked;
}
}
}
</script>
<!--Check all mark. Works with Javascript written above-->
<input type="checkbox" name="check_all" onclick="checkAll(this)" <?php if(isset($_POST['check_all'])){
echo "checked";} ?>> Check all: On/Off
<input type="submit" name="submit" value="sort">
</form>
<!--End Checkbox system for schools-->
</body>
</html>
關鍵是這一條:
echo '<input type="checkbox" name="check_list['.$row['id'].']" value="checked"';
您需要將check_list中的數組索引設置為行ID。 否則,數組中的行將基於0,並且其值=您的行ID。 您在post字段中使用的值的使用方式實際上並沒有得到使用。
check_list[0] = '1'
check_list[1] = '3'
check_list[2] = '5'
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.