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[英]How to delete a row in the table when I click on a button? Using Javascript
[英]How to delete a complete row on button click in javascript?
我有一個html/php 代碼,如下所示。 下面的html/php代碼的工作方式是在添加行時,我們可以從每一行中選擇日期並保存它。
需要做兩件事。
單擊“刪除”按鈕時,它應該從JSON數組中刪除該值,因為保存表單后所有內容都從JSON 中提取。
此外,在單擊刪除按鈕時,它應該從 DOM 中刪除完整的行。
你應該給每個添加的行一個與其等級相對應的 id:
row.id=i.toString();
然后使用以下代碼刪除該行:
var row = document.getElementById(rowrankid);
row.parentNode.removeChild(row);
我已經使用您的示例為您准備了一個代碼示例,該示例完全符合您的要求。
它使用 javascript fetch post 請求發布到您提供的腳本,以刪除 dom 元素並更新 json 文件。
我稍微改變了你的一些路徑,所以你需要把它們改回來(添加到 ../feeds/ 父目錄中)
一旦用戶按下按鈕,頁面將重新加載,顯示從 json 文件加載的更新界面。
可以進行一些改進,例如 javascript 不會在重新加載之前檢查以確保請求成功,但由於輸入是日期選擇它應該沒問題。
<?php
if(file_exists('./ptp-ess_landing_house.json')){
$data = json_decode(file_get_contents('./ptp-ess_landing_house.json'));
}
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$_POST = json_decode(file_get_contents('php://input'), true);
if(isset($_POST['requestType']) && in_array($_POST['requestType'], ['remove'])) {
switch ($_POST['requestType']) {
case 'remove' :
//Unset the values
unset($data->row_delete[$_POST['data'] -1]);
unset($data->house_sitting_date[$_POST['data'] -1]);
//We are reindexing the arrays as we have deleted some rows, note that we are using +1 array indexes
$data->row_delete = array_values($data->row_delete);
$data->house_sitting_date = array_values($data->house_sitting_date);
foreach($data->row_delete as $key=>$value) {
$data->row_delete[$key] = strval($key+1);
}
//Write the file back
$fp = fopen('./ptp-ess_landing_house.json', 'w');
fwrite($fp, json_encode($data));
fclose($fp);
header("HTTP/1.1 200 OK");
echo 'ok';
die;
break;
default:
}
}
}
?>
<script>
function rowDelete(row) {
//Make a request to your entry file (index.php here) to do the removal
fetch('/index.php', {
method: 'post',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
body: JSON.stringify({requestType: 'remove', data: row})
}).then(function(response) {
location.reload();
return response;
});
}
</script>
<?php if($data) { ?>
<form method="post">
<div id="rows" style="display:flex; justify-content: center;"><!-- Big div START -->
<!-- Remove Button START -->
<div class="rows-delete">
<h4 style="text-align:center;">Delete Rows</h4>
<?php if (empty($data->row_delete)) { ?>
<div class="row-delete" style="margin-right:30px; margin-top:22.5px;">
<button type="button" id="delete" onclick="rowDelete()">Remove</button>
<input type="hidden" name="row_delete[]" value="1" />
</div>
<?php } else { ?>
<?php foreach ($data->row_delete as $row_delete){ ?>
<div class="row-delete" style="margin-right:30px; margin-top:22.5px;">
<button id="delete" type="button" onclick="rowDelete(<?php echo $row_delete;?>)">Remove</button>
<input type="hidden" name="row_delete[]" value="<?php echo $row_delete;?>" />
</div>
<?php }} ?>
</div>
<!-- Remove Button END -->
<!-- Sitting Date START -->
<div class="sitting-days">
<h4 style="text-align:center;">Select Date</h4>
<?php if (empty($data->house_sitting_date)) { ?>
<!-- Select Date START -->
<div class="select-date" style="margin-right:30px; margin-top:20px;">
<input type="date" class="house-sitting-date" name="house_sitting_date[]" value="">
</div>
<?php } else { ?>
<?php foreach ($data->house_sitting_date as $date){ ?>
<!-- Select Date START -->
<div class="select-date" style="margin-right:30px; margin-top:20px;">
<input type="date" class="house-sitting-date" name="house_sitting_date[]" value="<?php if($date) {echo $date;}?>">
</div>
<!-- Select Date END -->
<?php }} ?>
</div>
<!-- Sitting Date END -->
</div><!-- Big div END -->
</form>
<?php } else {
echo 'Cannot read JSON settings file';
}
?>
如果您的 json 在前端是已知的(我認為您是在暗示,因為您的rowDelete
是一個 JS 函數),您可以通過調用rowDelete
來傳遞this
。 然后您可以遍歷 DOM 以獲取相應的兄弟輸入字段的值(可能類似於this.parentNode.childNodes[1]
)。
獲得該值后,您可以輕松地將其從 json 中的對應數組中刪除:
let d = '2020-01-30'
let idx = arr.indexOf(d)
let newdates = ([...arr.slice(0,idx), ...arr.slice(idx+1)])
data.house_sitting_date = newdates
(當然還有一些額外的索引邊界檢查)。
之后,您可以執行類似的 DOM 遍歷以從 DOM 中刪除相應的元素。
Flash,不幸的是,代碼本身的設計並不是很專業……行有單獨的循環(在 php 中),而應該只有 1 個循環,例如(單擊簡單的 Javascript 綁定示例):
<?php
for ($i=0; $i<count($data["house_sitting_date"]); $i++)
{
echo '<div class="remove"><a id="'.$data["row_delete"][$i].'" onclick="deleteRow(this);">Remove</a></div>';
echo '<div class="date">....</div>';
...
}
?>
<script> function deleteRow(el) { el.remove(); } </script>
此外,許多嵌入式style=""
.. 代碼,而您可能會使用 1 個樣式文件。
這就是我過去所做的,而且效果很好
這個答案工作的先決條件是每個按鈕和輸入字段都應該在具有唯一 ID 的 DIV 中,並且在我的情況下應該有所有這些 div 的容器
.
在“添加”按鈕(如果有)上,您需要克隆節點,並將其粘貼到單擊它的元素下方或上方,
// Create a clone of element with id ddl_1:
let clone = document.querySelector('#row'+rownumber).cloneNode( true );
// Append the newly created element on element p
document.querySelector('p').appendChild( clone );
然后,每次添加新行或刪除行時,您都需要在這些行上附加 id,為此,在我使用的情況下,您將為所有這些行創建一個公共類,行
function changeids()
{
let rows =document.getElementsByClassName('rows');
for(let i=0; i<rows.length; i++)
{
let thisid="row"+i;
rows[i].setAttribute("id", thisid);
let thisAddButton = rows[i].getElementsByClassName("add")[0];
let thisDeleteButton = rows[i].getElementsByClassName("delete")[0];
let onclickaddfunction = "addrow("+i+")";
thisAddButton.setAttribute("onclick", onclickaddfunction);
let onclickDeletefunction = "removerow("+i+")";
thisDeleteButton.setAttribute("onclick", onclickDeletefunction);
}
}
然后當您刪除時,您需要刪除節點並再次調用 changeids
function removerow(rownumber){
document.getElementById('row'+rownumber).remove();
changeids();
}
這會給你添加和刪除行的完整工作想法,下面的整個代碼請忽略我凌亂的代碼,只是為了給你和想法
<p>
<div id="row1" class="rows">
<button class="add" onclick="addrow(1)">add</button>
<button class="delete" onclick="removerow(1)"> remove </button>
<input type="text">
</div>
</p>
<script>
function addrow(rownumber)
{
// Create a clone of element with id ddl_1:
let clone = document.querySelector('#row'+rownumber).cloneNode( true );
// Append the newly created element on element p
document.querySelector('p').appendChild( clone );
changeids();
}
function removerow(rownumber)
{
document.getElementById('row'+rownumber).remove();
changeids();
}
function changeids()
{
let rows =document.getElementsByClassName('rows')
for(let i=0; i<rows.length; i++)
{
let thisid="row"+i;
rows[i].setAttribute("id", thisid);
let thisAddButton = rows[i].getElementsByClassName("add")[0];
let thisDeleteButton = rows[i].getElementsByClassName("delete")[0];
let onclickaddfunction = "addrow("+i+")";
thisAddButton.setAttribute("onclick", onclickaddfunction);
let onclickDeletefunction = "removerow("+i+")";
thisDeleteButton.setAttribute("onclick", onclickDeletefunction);
}
}
</script>
要從 dom 中刪除行,您必須為行的主要元素指定唯一 id,您可以使用 [ElementObject].remove() 方法進行刪除,因此里面的所有內容都將被刪除。 此外,您應該簡化和更改 JSON 數據,以便它也使用 ajax 從 json 中刪除,並使用單個 id(key) 作為參數。
這是工作代碼:
<?php
if (!empty($_GET)) {
if (!empty($_GET['action']) && $_GET['action'] == 'delete') {
if(file_exists('ptp-ess_landing_house.json')) {
$data = json_decode(file_get_contents('ptp-ess_landing_house.json'), true);
if (!empty($_GET['row_number'])) {
unset($data[$_GET['row_number']]);
$fp = fopen('ptp-ess_landing_house.json', 'w');
fwrite($fp, json_encode($data));
fclose($fp);
echo 1;
exit;
}
}
echo 0;
exit;
}
}
if (!empty($_POST)) {
$output = array();
if (!empty($_POST['row_item'])) {
$output = $_POST['row_item'];
}
$fp = fopen('ptp-ess_landing_house.json', 'w');
fwrite($fp, json_encode($output));
fclose($fp);
}
$data = array();
if(file_exists('ptp-ess_landing_house.json')) {
$data = json_decode(file_get_contents('ptp-ess_landing_house.json'), true);
}
?><form method="post">
<!-- Add New Row Button START -->
<div class="plus-minus-button" style="text-align:center;">
<button type="button" id="addRow" onclick="rowAdd()">+</button>
</div>
<!-- Add New Row Button END -->
<div id="maindiv">
<div style="display:flex; justify-content: center;">
<div class="rows-delete" style="text-align:center;">
<div class="row-delete" style="margin-right:30px;">
<h4 style="text-align:center;">Delete Rows</h4>
</div>
</div>
<div class="sitting-days" style="text-align:center;">
<div class="select-date" style="margin-right:30px;">
<h4 style="text-align:center;">Select Date</h4>
</div>
</div>
<div class="choose-options" style="text-align:center;">
<div class="yes-no-option" style="display:inline-grid;">
<h4 style="text-align:center;">Yes/No</h4>
</div>
</div>
</div>
<!-- Big div START --><?php
$totalrow = 0;
foreach ($data AS $key => $row) {
?><div id="row-<?php echo $key; ?>" style="display:flex; justify-content: center; margin-top:20px;"><?php
?><div class="rows-delete" style="text-align:center;">
<div class="row-delete" style="margin-right:30px;">
<button type="button" class="delete" onClick="delete_row(this.value)" value="<?php echo $key; ?>">Remove</button>
<input type="hidden" name="row_item[<?php echo $key; ?>][row_delete]" value="<?php echo $row['row_delete'];?>" />
</div>
</div>
<!-- Remove Button END -->
<!-- This is what I have tried to add a button (END) -->
<!-- Sitting Date START -->
<div class="sitting-days" style="text-align:center;">
<div class="select-date" style="margin-right:30px;">
<input type="date" class="house-sitting-date" name="row_item[<?php echo $key; ?>][house_sitting_date]" value="<?php echo $row['house_sitting_date']; ?>">
</div>
</div>
<!-- Sitting Date END -->
<!-- YES/NO START --><?php
?><div class="choose-options">
<div class="yes-no-option" style="display:inline-grid;">
<select name="row_item[<?php echo $key; ?>][house_sitting_date_yes_no]" class="house-yes-no" style="height:24px; ">
<option value="<?php echo $row['house_sitting_date_yes_no']; ?>" <?php if($row['house_sitting_date_yes_no'] == "nada" ) echo "selected";?>>Please choose an option</option>
<option value="<?php echo $row['house_sitting_date_yes_no']; ?>" <?php if($row['house_sitting_date_yes_no'] == "yes" ) echo "selected";?>>Yes</option>
<option value="<?php echo $row['house_sitting_date_yes_no']; ?>" <?php if($row['house_sitting_date_yes_no'] == "no" ) echo "selected";?>>No</option>
</select>
</div>
</div>
<!-- YES/NO END -->
</div><?php
if ($key > $totalrow) $totalrow = $key;
else $totalrow++;
}
?>
<input type="hidden" name="totalrow" id="totalrow" value="<?php echo $totalrow; ?>">
</div>
<!-- Big div END -->
<hr />
<div style="text-align:center;">
<input type="submit" value="submit" />
</div>
</form>
<script>
function delete_row(row_number) {
var data = '<?php echo json_encode($data) ?>';
data = JSON.parse(data);
if (typeof(data[row_number]) != undefined) {
var request = new XMLHttpRequest();
request.open("GET", "index.php?action=delete&row_number=" + row_number);
request.onreadystatechange = function() {
if (this.readyState === 4 && this.status === 200) {
var row = document.getElementById('row-'+row_number);
row.remove();
}
}
request.send();
}
else {
var row = document.getElementById('row-'+row_number);
row.remove();
}
}
function rowAdd(event) {
var totalrow = document.getElementById("totalrow").value;
totalrow = parseInt(totalrow) + 1;
document.getElementById("maindiv").insertAdjacentHTML('beforeend', newRow(totalrow));
document.getElementById("totalrow").value = totalrow;
}
function newRow(row_number) {
return `<div id="row-` + row_number + `" class="sitting-days" style="display:flex; justify-content:center; margin-top:20px;">
<div class="rows-delete" style="text-align:center;">
<div class="row-delete" style="margin-right:30px;">
<button type="button" class="delete" onClick="delete_row(this.value)" value="` + row_number + `">Remove</button>
<input type="hidden" name="row_item[` + row_number + `][row_delete]" value="` + row_number + `" />
</div>
</div>
<div class="sitting-days" style="text-align:center;">
<div class="select-date" style="margin-right:30px;">
<input type="date" class="house-sitting-date" name="row_item[` + row_number + `][house_sitting_date]" value="">
</div>
</div>
<div class="choose-options">
<div class="yes-no-option" style="display:inline-grid;">
<select name="row_item[` + row_number + `][house_sitting_date_yes_no]" class="house-yes-no" style="height:24px; ">
<option value="nada">Please choose an option</option>
<option value="yes">Yes</option>
<option value="no">No</option>
</select>
</div>
</div>
</div>`;
}
</script>
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