添加动态数据消失 [英] Dynamic data disappearing on adding
本文介绍了添加动态数据消失的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个表单添加外部用户，默认情况下，其中2个字段不是必需的。但是，只有当其中一个字段填写时，它们才成为强制性的。在单击应用按钮时，我的窗体的内容用于生成一个动态div，该div附加到'div.container'。但是，一旦添加，它就会消失。
I've a form to add External User in which 2 of the fields are not mandatory by default. However, they become mandatory only if one of those fields are filled out. On clicking the apply button, the content of my form is used to generate a dynamic div which gets appended to the 'div.container'. However, it is just disappearing as soon as it is added.
可能是什么原因？
以下是代码：
var currentPageNo = 0; // Keep track of currently displayed page
// Select button that is descendant of userList
$('#userList .prev-btn').click(function(){
userList(currentPageNo-10);
});
$('#userList .next-btn').click(function(){
userList(currentPageNo+10);
});
$('#adminList .prev-btn').click(function(){
adminList(currentPageNo-10);
});
$('#adminList .next-btn').click(function(){
adminList(currentPageNo+10);
});
function userList(pageNo) {
var resType="userList";
createTable(resType,pageNo);
}
function adminList(pageNo) {
var resType="adminList";
createTable(resType,pageNo);
}
function createTable(resType, pageNo) {
// Update global variable
currentPageNo = pageNo;
// Set visibility of the correct "prev" button:
$('#' + resType + ' .prev-btn').toggle(pageNo > 0);
// Ask one record more than needed, to determine if there are more records after this page:
$.getJSON("https://api.randomuser.me/?results=11&resType="+resType + "&pageIndex=" + pageNo, function(data) {
var $table = $('#' + resType + ' table');
$('tr:has(td)', $table).empty();
// Check if there's an extra record which we do not display,
// but determines that there is a next page
$('#' + resType + ' .next-btn').toggle(data.results.length > 10);
// Slice results, so 11th record is not included:
data.results.slice(0, 10).forEach(function (record, i) { // add second argument for numbering records
var json = JSON.stringify(record);
$table.append(
$('<tr>').append(
$('<td>').append(
$('<input>').attr('type', 'checkbox')
.addClass('selectRow')
.val(json),
(i+1+pageNo) // display row number
),
$('<td>').append(
$('<a>').attr('href', record.picture.thumbnail)
.addClass('imgurl')
.attr('target', '_blank')
.text(record.name.first)
),
$('<td>').append(record.dob)
)
);
});
// Show the prev and/or buttons
}).fail(function(error) {
console.log("**********AJAX ERROR: " + error);
});
}
var savedData = []; // The objects as array, so to have an order.
function saveData(){
var errors = [];
// Add selected to map
$('input.selectRow:checked').each(function(count) {
// Get the JSON that is stored as value for the checkbox
var obj = JSON.parse($(this).val());
// See if this URL was already collected (that's easy with Set)
if (savedData.find(record => record.picture.thumbnail === obj.picture.thumbnail)) {
errors.push(obj.name.first);
} else {
// Append it
savedData.push(obj);
}
});
refreshDisplay();
if (errors.length) {
alert('The following were already selected:\n' + errors.join('\n'));
}
}
function refreshDisplay() {
$('.container').html('');
savedData.forEach(function (obj) {
// Reset container, and append collected data (use jQuery for appending)
$('.container').append(
$('<div>').addClass('parent').append(
$('<label>').addClass('dataLabel').text('Name: '),
obj.name.first + ' ' + obj.name.last,
$('<br>'), // line-break between name & pic
$('<img>').addClass('myLink').attr('src', obj.picture.thumbnail), $('<br>'),
$('<label>').addClass('dataLabel').text('Date of birth: '),
obj.dob, $('<br>'),
$('<label>').addClass('dataLabel').text('Address: '), $('<br>'),
obj.location.street, $('<br>'),
obj.location.city + ' ' + obj.location.postcode, $('<br>'),
obj.location.state, $('<br>'),
$('<button>').addClass('removeMe').text('Delete'),
$('<button>').addClass('top-btn').text('Swap with top'),
$('<button>').addClass('down-btn').text('Swap with down')
)
);
})
// Clear checkboxes:
$('.selectRow').prop('checked', false);
handleEvents();
}
function logSavedData(){
// Convert to JSON and log to console. You would instead post it
// to some URL, or save it to localStorage.
console.log(JSON.stringify(savedData, null, 2));
}
function getIndex(elem) {
return $(elem).parent('.parent').index();
}
$(document).on('click', '.removeMe', function() {
// Delete this from the saved Data
savedData.splice(getIndex(this), 1);
// And redisplay
refreshDisplay();
});
/* Swapping the displayed articles in the result list */
$(document).on('click', ".down-btn", function() {
var index = getIndex(this);
// Swap in memory
savedData.splice(index, 2, savedData[index+1], savedData[index]);
// And redisplay
refreshDisplay();
});
$(document).on('click', ".top-btn", function() {
var index = getIndex(this);
// Swap in memory
savedData.splice(index-1, 2, savedData[index], savedData[index-1]);
// And redisplay
refreshDisplay();
});
/* Disable top & down buttons for the first and the last article respectively in the result list */
function handleEvents() {
$(".top-btn, .down-btn").prop("disabled", false).show();
$(".parent:first").find(".top-btn").prop("disabled", true).hide();
$(".parent:last").find(".down-btn").prop("disabled", true).hide();
}
$(document).ready(function(){
$('#showExtForm-btn').click(function(){
$('#extUser').toggle();
});
var $dob = $('#dob');
var $myImg = $('#myImg');
var $formData = $($dob).add($myImg);
$formData.on('change', function(e) {
var dob = $dob.val();
var myImg = $myImg.val();
$formData.prop('required', dob || myImg);
});
$("#extUserForm").submit(function(e){
var dob = $dob.val();
var myImg = $myImg.val();
var dataFilled = !!dob && !!myImg;
var dataUnfilled = !dob && !myImg;
if (toolFilled || toolUnfilled) {
addExtUser();
return true;
}
return false;
});
});
function addExtUser() {
var extObj = {
name: {
title: "mr", // No ladies? :-)
first: $("#name").val(),
// Last name ?
},
dob: $("#dob").val(),
picture: {
thumbnail: $("#myImg").val()
},
location: { // maybe also ask for this info?
}
};
savedData.push(extObj);
refreshDisplay(); // Will show some undefined stuff (location...)
}
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#userList" onclick="userList(0)">User List</button>
<button class="btn btn-primary btn-sm" onclick="logSavedData()">Get Saved Data</button>
<button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#adminList" onclick="adminList(0)">User Admin</button>
<button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#extUser">Open External Form</button>
<div class="modal fade" id="userList" role="dialog">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">User List</h4>
</div>
<div class="modal-body">
<div class="table-responsive">
<table class="table table-bordered table-hover" id="datatable">
<tr>
<th>Select</th>
<th>Name</th>
<th>DOB</th>
</tr>
</table>
</div>
<div class="row">
<div class="col-sm-offset-3 col-sm-4">
<button type="button" class="btn btn-primary prev-btn"><span class="glyphicon glyphicon-chevron-left"></span></button>
</div>
<div class="col-sm-4">
<button type="button" class="btn btn-primary next-btn"><span class="glyphicon glyphicon-chevron-right"></span></button>
</div>
</div>
<hr/>
<div class="row">
<div class="col-sm-offset-3 col-sm-4">
<button type="button" class="btn btn-primary btn-sm" onclick="saveData()">Save selected</button>
</div>
<div class="col-sm-4">
<button type="button" class="btn btn-primary btn-sm close-less-modal" data-dismiss="modal">Close</button>
</div>
</div>
<br />
</div>
</div>
</div>
</div>
<div class="modal fade" id="adminList" role="dialog">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Admin List</h4>
</div>
<div class="modal-body">
<div class="table-responsive">
<table class="table table-bordered table-hover" id="datatable">
<tr>
<th>Select</th>
<th>Name</th>
<th>DOB</th>
</tr>
</table>
</div>
<div class="row">
<div class="col-sm-offset-3 col-sm-4">
<button type="button" class="btn btn-primary prev-btn"><span class="glyphicon glyphicon-chevron-left"></span></button>
</div>
<div class="col-sm-4">
<button type="button" class="btn btn-primary next-btn"><span class="glyphicon glyphicon-chevron-right"></span></button>
</div>
</div>
<hr/>
<div class="row">
<div class="col-sm-offset-3 col-sm-4">
<button type="button" class="btn btn-primary btn-sm" onclick="saveData()">Save selected</button>
</div>
<div class="col-sm-4">
<button type="button" class="btn btn-primary btn-sm close-less-modal" data-dismiss="modal">Close</button>
</div>
</div>
<br />
</div>
</div>
</div>
</div>
<div class="modal fade" id="extUser" role="dialog">
<div class="modal-dialog modal-lg">
<!-- External User-->
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Add External User</h4>
</div>
<div class="modal-body">
<form class="form-horizontal" id="extUserForm">
<div class="form-group">
<label class="control-label col-sm-3" for="name">Name:</label>
<div class="col-sm-8">
<input type="text" class="form-control" id="name" name="name" required>
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-3" for="myImg">Image:</label>
<div class="col-sm-8">
<input type="text" class="form-control" id="myImg" name="myImg">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-3" for="dob">DOB:</label>
<div class="col-sm-8">
<input type="date" class="form-control" id="dob" name="dob">
</div>
</div>
<hr />
<div class="form-group">
<div class="col-sm-offset-3 col-sm-3">
<button class="btn btn-primary btn-sm">Submit</button>
</div>
<div class="col-sm-3">
<button type="reset" class="btn btn-primary btn-sm">Reset</button>
</div>
<div class="col-sm-3">
<button type="button" class="btn btn-primary btn-sm close-external-modal" data-dismiss="modal">Close</button>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
<div class="container"></div>
推荐答案
主要问题是在 $（＃extUserForm）。submit
return true;
这将使默认的表单提交效果进入，即页面将导航到窗体的 action 属性，或者如果没有（就像你的情况），页面将重新加载。这就是为什么你简要地看到页面上的条目，就在页面被重新加载之前，所有的东西都从头开始。
This will make the default form-submission effect kick in, i.e. the page will navigate to the form's action attribute, or if there is none (as is your case), the page will reload. That is why you briefly see the entry on the page, just before the page is reloaded, and everything starts from scratch.
所以，你必须坚持：
return false;
注意：有一个变量名称不匹配： dataFilled 与 toolFilled 不一样，...对于 dataUnfilled 。
NB: there was a variable name mismatch: dataFilled is not the same as toolFilled, ... same for dataUnfilled.
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