我试图先通过两种方式动态添加选择字段，然后为选择字段提供值。 同时进行动态尝试，使其运作良好。但是当试图通过显示某些选择字段时 给'1st room child'选择字段赋值，因此第一次是im接收输出，但是第二次是 不起作用
$(function () {
/*here my values to increment whenever added newly form */
var i = 1;
i++;
var max_fields = 6;
var this_button_work_for_click_to_add_rooms = $(".this_button_work_for_click_to_add_rooms");
var this_is_field_wrapper = $(".this_is_field_wrapper");
//here we starting counting...
var input_count = 1;
//add buttong dynamically over here...
$(this_button_work_for_click_to_add_rooms).click(function (event) {
/* Act on the event */
if (input_count < max_fields) {
input_count++;
var add_fields = '<div><div class="row"><div class="form-group"><div class="col-xs-1"><h6>Options -</h6><h6 class="#">Adults(12+)</h6><select id="selected_adults[]" name="selected_adults[]" class="form-control"><option value="1">1</option><option selected="selected" value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option></select></div><!-- </div><div class="form-group"> --><div class="col-xs-1"><h6>' + input_count + ' Room</h6><h6 class="m_label">Child(0-12)</h6><select id="selected_childs[]" name="selected_childs[]" onchange="displayingNumberOfChildAge(this);" class="form-control"><option>select</option><option id="first_child_col" value="1">1</option><option id="second_child_col" value="2">2</option></select></div><!-- </div><div class="form-group"> --><div id="childage0" class="col-xs-1"><h6></h6></div><div id="childage1" class="col-xs-1"><h6></h6></div><a href="javascript:void(0);" class="remove_input_button" title="Remove field">remove</a></div><!-- here ending form group --></div><!-- here ending row --></div>';
$(this_is_field_wrapper).append(add_fields);
}
});
$(this_is_field_wrapper).on('click', '.remove_input_button', function (e) {
e.preventDefault();
$(this).parent('div').remove();
input_count--;
});
});
function addFields() {
var number = document.getElementById("selected_childs[]").value;
var childage = document.getElementById("childage0");
//Create array of options to be added
var array = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"];
while (childage.hasChildNodes()) {
childage.removeChild(childage.lastChild);
}
if (number == 1) {
// statement
for (i = 0; i < number; i++) {
var h = document.createElement("h6");
h.setAttribute("id", "firstever");
var h1 = document.createElement("h6");
h1.appendChild(document.createTextNode("select child age"));
childage.appendChild(h1);
h.appendChild(document.createTextNode("Children Age " + (i + 1)));
childage.appendChild(h);
var selectList = document.createElement("select");
selectList.setAttribute("id", "mySelect");
selectList.setAttribute("class", "form-control");
childage.appendChild(selectList);
childage.appendChild(document.createElement("br"));
//Create and append the options
for (var j = 0; j < array.length; j++) {
var option = document.createElement("option");
option.setAttribute("value", array[j]);
option.text = array[j];
selectList.appendChild(option);
}
}
} else {
// statement
for (i = 0; i < number; i++) {
childage = document.getElementById("childage" + i);
var h1 = document.createElement("h6");
h1.setAttribute("id", "secondever");
h1.appendChild(document.createTextNode("select child age"));
childage.appendChild(h1);
var h = document.createElement("h6");
h.appendChild(document.createTextNode("Children Age " + (i + 1)));
childage.appendChild(h);
var selectList = document.createElement("select");
selectList.setAttribute("id", "mySelect");
selectList.setAttribute("class", "form-control");
childage.appendChild(selectList);
childage.appendChild(document.createElement("br"));
//Create and append the options
for (var j = 0; j < array.length; j++) {
var option = document.createElement("option");
option.setAttribute("value", array[j]);
option.text = array[j];
selectList.appendChild(option);
}
}
}
}<!DOCTYPE html>
<html>
<head>
<title>Welcome|Home</title>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<form method="POST" action="<?php echo base_url(); ?>index.php/dynamically_added_controller/Dynamically/addingValues">
<div class="this_is_field_wrapper">
<div class="row">
<div class="form-group">
<div class="col-xs-1">
<h6>Options -</h6>
<h6 class="#">Adults(12+)</h6>
<select id="selected_adults[]" name="selected_adults[]" class="form-control">
<option value="1">1</option>
<option selected="selected" value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
</div>
<div class="col-xs-1">
<h6>1st Room</h6>
<h6 class="m_label">Child(0-12)</h6>
<select id="selected_childs[]" name="selected_childs[]" value="" onchange="addFields()" class="form-control">
<option>--select--</option>
<option value="1">1</option>
<option value="2">2</option>
</select>
</div>
<div id="childage0" class="col-xs-1">
<h6></h6>
</div>
<div id="childage1" class="col-xs-1">
<h6></h6>
</div>
<div class="col-xs-1">
<a href="javascript:void(0);" class="this_button_work_for_click_to_add_rooms" title="Add field">Click & Add Rooms</a>
</div>
</div>
</div>
</div>
<button type="submit" value="submit">click to submit</button>
</form>
</body>
</html>
如您所见，问题在于，尝试通过为“第一个房间孩子”选择字段赋予值来尝试第二次显示选择字段，从而使其无法正常工作。
答案 0 :(得分：0)
您的问题是所谓的“委托”。当您向DOM动态添加一些首次加载时不存在的内容时，您必须先浏览一下已存在的父项。
考虑一下。您已有一个元素：<div id="loaded"></div>
然后，您在该div中动态添加一些内容：<button type="button" id="someButton">
要收听该点击，您必须遍历父div，因为它是DOM的原始部分。
$('#loaded').on('click', '#someButton', function () {
//do something
});