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我需要動態顯示用戶輸入的路徑的名稱和分割路徑。 爲此，我分割了用戶輸入的路徑，並只抓取其中的一部分。對於例如如果用戶輸入路徑爲：如果存在JSON屬性，則返回分割路徑否則返回空白
/content/mypath/myfolder/about/images/abc.jpg 然後我顯示圖像/ abc.jpg。
但是，讓我們假設一些用戶沒有圖片，至少名稱應該應用&在這種情況下顯示。
有關詳細信息，請檢查函數refreshDisplay（）。 但它會拋出一個錯誤 - 未捕獲TypeError：無法讀取未定義的屬性「匹配」
如何解決此問題？
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
$('#' + resType + ' .next-btn').toggle(data.results.length > 10);
// Slice results, so 11th record is not included:
data.results.slice(0, 10).forEach(function (record, i) { // add second argument for numbering records
var json = JSON.stringify(record);
var imgPath = record.picture.thumbnail;
var newPath = imgPath.match(/portraits\/.*$/i);
$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)
text(function(imgPath){
return newPath != null ? newPath : record.picture.thumbnail;
})
),
$('<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')
) \t
);
})
// 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();
});
\t
\t var $dob = $('#dob');
\t var $myImg = $('#myImg');
\t var $formData = $($dob).add($myImg);
\t
\t $formData.on('change', function(e) {
\t var dob = $dob.val();
\t var myImg = $myImg.val();
\t
\t $formData.prop('required', dob || myImg);
\t
\t });
\t
$("#extUserForm").submit(function(e){
var dob = $dob.val();
\t \t var myImg = $myImg.val();
\t \t
\t \t var dataFilled = !!dob && !!myImg;
\t \t var dataUnfilled = !dob && !myImg;
\t \t \t
\t \t if (toolFilled || toolUnfilled) {
\t \t \t addExtUser();
\t \t \t return true;
\t \t }
\t \t 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"/>
<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>