Question

我有2个弹出窗口显示用户列表＆amp;管理员列表，每页显示10个结果，工作正常。

我正在收到页面。来自JSON中的java servlet。

注意：url中传递了2个参数 - resType和pageNo。您做生意。返回0,10,20 ......（10的倍数）。 resType：检查我想要的结果类型。你可以忽略这部分。

所以我在createTable函数中的url看起来像这样 -

当它是第一页时，如何禁用上一个按钮？同样，如果它是最后一页，如何禁用最后一个按钮？

这是代码。

var currentPageNo = 0; // Keep track of currently displayed page

		$('.next-btn').unbind("click").on("click",function(){ // Give buttons an ID (include them in HTML as hidden)
			userList(currentPageNo+10);
			adminList(currentPageNo+10);
			
		});
		$('.prev-btn').unbind("click").on("click",function(){
			userList(currentPageNo-10);
			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 "prev" button:
			$('.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&start="+pageNo, function(data) {
				$('#datatable tr:has(td)').empty();
				// Check if there's an extra record which we do not display, 
				// but determines that there is a next page
				$('.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);
					$('#datatable').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();
			});
			$("#extUserForm").submit(function(e){
				addExtUser();
				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...)
		}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<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>
<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">&times;</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">&times;</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">&times;</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" required>
								  </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" required>
								  </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>

Answer 1

在 createTable 中，应区分要填充的两个表中的哪一个。所以你应该使用像：

这样的选择器

$('#' + resType + ' table')

应该对prev / next按钮选择器进行相同的区分：

$('#' + resType + ' .next-btn')

在同一个点击处理程序中同时调用 userList 和 adminList 也是错误的，因为它会跳过一页结果（从0到20）。您应该根据选择器调用适当的一个。因此，将您的上一个/下一个点击处理程序更改为：

// 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);
});

最后，如果您更改服务器上的一件事，代码将隐藏 next 按钮：让它返回11条记录而不是10条。然后，JavaScript代码可以知道在10条记录之后是否有还有更多数据（没有显示第11条记录）。

这是更新的代码：

＆＃13;

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();
    });
    $("#extUserForm").submit(function(e){
        addExtUser();
        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...)
}

＆＃13;

<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">&times;</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">&times;</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">&times;</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" required>
              </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" required>
              </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>

＆＃13;

检查最后一页和第一页并相应地禁用下一个上一个按钮

1 个答案: