[英]Cant access value from the HTML dataset
在從一個 div 拖放到另一個 div 時,我使用 Dataset 來獲取一些不同的值。 但是當我調用 Javascript function 時,我無法訪問其他屬性,例如data-customerId
。
HTML 與 PHP 動態數據:
<fieldset id="div1" ondrop="drop(event)" ondragover="allowDrop(event)">
<legend style="color:cadetblue; border:white; width:auto; font:bold">Vacant parking spots</legend>
<?php $counter = 0; foreach ($sql_get_vacant_spots_results_ as $row) { ?>
<div id="<?php echo $counter; ?>" data-customerid="<?php echo $arr_users[0]['customer_id']; ?>" data-y="<?php echo $row['spot_no'] ?>" data-z="<?php echo $row['location_id'] ?>" style="float: left; width: 120px;height: 80px;padding: 10px;border-radius: 20px;margin: 10px;background-color: cadetblue;" draggable="true" ondragstart="drag(event)" width="88" height="31">
<labled style="color: white; font:bold; font-size:large;"><?php echo 'Spot: ' . $row['spot_no'] . ' Gate: ' . $row['parking_gate_id'] ?></label>
</div>
<?php $counter++; } ?>
</fieldset>
<fieldset id="div2" ondrop="drop(event)" ondragover="allowDrop(event)">
<legend style="color:cadetblue; border:white; width:auto; font:bold">Current parking spots of the customer</legend>
<?php $count = 0; foreach ($arr_users as $user) { ?>
<div id="<?php echo $count ?>" data-customerid="<?php echo $user['customer_id'] ?>" data-y="<?php echo $user['spot_id'] ?>" data-z="<?php echo $user['location_id'] ?>" style="float: left; width: 120px;height: 80px;padding: 10px;border-radius: 20px;margin: 10px;background-color: cadetblue;" draggable="true" width="88" height="31">
<labled style="color: white; font:bold; font-size:large;"><?php echo 'Spot: ' . $user['spot_id'] . ' Gate: ' . $user['gate_id'] ?></label>
</div>
<?php $count++; } ?>
</fieldset>
這是 Javascript:
function drop(ev) {
const el = document.querySelector('#' +ev.dataTransfer.getData("text")); //prints: Uncaught DOMException: Failed to execute 'querySelector' on 'Document': '#33' is not a valid selector.
console.log('drop', el.dataset.customerid);
ev.preventDefault();
var data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
}
通過像這樣訪問 id 來修復:
const el = document.querySelector("[id=" + "\'" + ev.dataTransfer.getData("text") + "\'" + "]");
編輯:
Html 元件編號:
id="count_id<?php echo $counter; ?>"
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