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我使用普通JS動態創建表單。每當最後一個輸入字段收到一個輸入時，應該創建另一個空的輸入。另一方面，當最後一個字段變爲空時，最後一個字段應該被刪除。當應用於多個元素時觸發事件僅一次
HTML（之前用戶輸入）：
<div id="eventList" class="gap">
<input id="event1" class="text bold eventBox" type="text" name="event1" placeholder="Ereignis 1" /> <br>
</div>
的Javascript（後實施;在摘錄）：
function addBox() {
var boxes = document.getElementsByClassName("eventBox");
var id = +getMaxID(boxes, "event") + +1; // ID of input being created
var list = document.getElementById("eventList");
list.innerHTML = list.innerHTML + '<input id="event'+ id +'" class="text bold eventBox" type="text" name="event'+ id +'" placeholder="Ereignis '+ id +'" /> <br>';
document.getElementById("event" + id).addEventListener("input", resizeEventList);
}
function delBox() {
loadTexts(); // save current inputs
var list = document.getElementById("eventList");
document.getElementById("eventList").innerHTML = '';
var id = 1;
for (var i = 1; i < eventTexts.length; i++) {
if (eventTexts[i].length > 0) {
/* recreate box with its former input (if not empty) */
document.getElementById("eventList").innerHTML = document.getElementById("eventList").innerHTML + '<input id="event'+ id +'" class="text bold eventBox" type="text" name="event'+ id +'" placeholder="Ereignis '+ id +'" value="' + eventTexts[i] + '"/> <br>';
document.getElementById("event" + id).addEventListener("input", resizeEventList);
id++;
}
}
/* add new last empty input */
document.getElementById("eventList").innerHTML = document.getElementById("eventList").innerHTML + '<input id="event'+ id +'" class="text bold eventBox" type="text" name="event'+ id +'" placeholder="Ereignis '+ id +'" value=""/> <br>';
document.getElementById("event" + id).addEventListener("input", resizeEventList);
}
function resizeEventList(e) {
if (typeof e != 'undefined') {
var boxes = document.getElementsByClassName("eventBox");
if (e.target.id == "event"+getMaxID(boxes, "event") && e.type == 'input') {
/* input into last available box -> add an empty box */
loadTexts(); // save current inputs
senderID = e.target.id; // remember ID of triggering element for resetting focus afterwards
addBox(); // add another box
writeTexts(); // write former inputs back into boxes
document.getElementById(senderID).focus(); // reset focus
} else if (e.target.value.length == 0 && getID(e.target, "event") < getMaxID(boxes, "event")) {
/* box before last box empty -> delete last empty box */
senderID = e.target.id; // remember ID of triggering element for resetting focus afterwards
delBox(); // delete all boxes and create X new boxes
document.getElementById(senderID).focus(); // reset focus
}
}
}
var eventTexts = new Array();
var senderID;
document.getElementById("event1").addEventListener("input", resizeEventList);
現在的問題：當我申請的所有事件監聽器只名爲輸入「事件1「，代碼按預期工作 - 打字時添加輸入，空白時刪除，僅適用於event1。當我將事件偵聽器也應用於動態創建的輸入時（應該是這樣，並且將其寫入上面的代碼中），輸入事件在有史以來的第一個輸入中只觸發一次，包括event1。以下所有輸入不再記錄。
有沒有人有解決方案？
感謝，Jaspa
---全碼--------------------
<form id="planForm" class="top-margin" method="post" action="new.php?action=add">
<div>
<input class="text head bold" type="date" name="date" placeholder="Datum" value="<?php echo date("Y-m-d", time());?>" required /> <br>
<div id="eventList" class="gap">
<input id="event1" class="text bold eventBox" type="text" name="event1" placeholder="Ereignis 1" /> <br>
</div>
</div >
<input type="button" value="Speichern" onclick="save();"/>
</form>
<script>
function getID(elm, type) {
if (typeof elm != 'undefined') {
return elm.id.replace(type, "");
} else {
return "";
}
}
function getMaxID(list, type) {
currID = 0;
max = 0;
if (list != null && list.length > 0 && type != null) {
for (var i=0; i < list.length; i++) {
currID = getID(list[i], type);
if (currID > max) {
max = currID;
}
}
}
return max;
}
function addBox() {
var boxes = document.getElementsByClassName("eventBox");
var id = +getMaxID(boxes, "event") + +1; // ID of input being created
var list = document.getElementById("eventList");
list.innerHTML = list.innerHTML + '<input id="event'+ id +'" class="text bold eventBox" type="text" name="event'+ id +'" placeholder="Ereignis '+ id +'" /> <br>';
document.getElementById("event" + id).addEventListener("input", resizeEventList);
console.log(document.getElementById("event" + id));
}
function delBox() {
loadTexts(); // save current inputs
var list = document.getElementById("eventList");
document.getElementById("eventList").innerHTML = '';
var id = 1;
for (var i = 1; i < eventTexts.length; i++) {
if (eventTexts[i].length > 0) {
/* recreate box with its former input (if not empty) */
document.getElementById("eventList").innerHTML = document.getElementById("eventList").innerHTML + '<input id="event'+ id +'" class="text bold eventBox" type="text" name="event'+ id +'" placeholder="Ereignis '+ id +'" value="' + eventTexts[i] + '"/> <br>';
document.getElementById("event" + id).addEventListener("input", resizeEventList);
id++;
}
}
/* add new last empty input */
document.getElementById("eventList").innerHTML = document.getElementById("eventList").innerHTML + '<input id="event'+ id +'" class="text bold eventBox" type="text" name="event'+ id +'" placeholder="Ereignis '+ id +'" value=""/> <br>';
document.getElementById("event" + id).addEventListener("input", resizeEventList);
}
function resizeEventList(e) {
if (typeof e != 'undefined') {
var boxes = document.getElementsByClassName("eventBox");
if (e.target.id == "event"+getMaxID(boxes, "event") && e.type == 'input') {
/* input into last available box -> add an empty box */
loadTexts(); // save current inputs
senderID = e.target.id; // remember ID of triggering element for resetting focus afterwards
addBox(); // add another box
writeTexts(); // write former inputs back into boxes
document.getElementById(senderID).focus(); // reset focus
} else if (e.target.value.length == 0 && getID(e.target, "event") < getMaxID(boxes, "event")) {
/* box before last box empty -> delete last empty box */
senderID = e.target.id; // remember ID of triggering element for resetting focus afterwards
delBox(); // delete all boxes and create X new boxes
document.getElementById(senderID).focus(); // reset focus
}
}
}
function loadTexts() {
var boxes = document.getElementsByClassName("eventBox");
for (var i=0; i < boxes.length; i++) {
eventTexts[getID(document.getElementById(boxes[i].id), "event")] = boxes[i].value;
}
}
function writeTexts() {
var boxes = document.getElementsByClassName("eventBox");
for (var i=0; i < boxes.length-1; i++) {
document.getElementById(boxes[i].id).value = eventTexts[getID(boxes[i], "event")];
}
}
var eventTexts = new Array();
var senderID;
document.getElementById("event1").addEventListener("input", resizeEventList);
</script>
你註冊了，你實際上在添加監聽器之前獲取頁面上的元素？ – mhatch
是的，我得到正確的ID，但只在第一次輸入之後。進一步的輸入根本不觸發事件 – Jaspa
你看到這是否返回元素？ document.getElementById（「event」+ id） –