【发布时间】：2017-09-07 18:28:04
【问题描述】：
我有一个弹出窗口来显示用户列表，每页显示 10 个结果，效果很好。
我正在获取页码。来自 JSON 中的 java servlet。 当它是第一页时，如何禁用上一个按钮？ 同样，当最后一页是最后一页时，如何禁用最后一个按钮？
这是我的代码。
function userList(pageNo) {
var resType="userList";
createTable(resType,pageNo);
$(document).on('click', '.next-btn', function(){
var next = 10+pageNo;
userList(next);
});
$(document).on('click', '.prev-btn', function(){
var previ = pageNo - 10;
userList(previ);
});
}
function createTable(resType, pageNo) {
$.getJSON("https://api.randomuser.me/?results="+pageNo, function(data) {
$('#datatable tr:has(td)').remove();
data.results.forEach(function (record) {
var json = JSON.stringify(record);
$('#datatable').append(
$('<tr>').append(
$('<td>').append(
$('<input>').attr('type', 'checkbox')
.addClass('selectRow')
.val(json)
),
$('<td>').append(
$('<a>').attr('href', record.picture.thumbnail)
.addClass('imgurl')
.attr('target', '_blank')
.text(record.name.first)
),
$('<td>').append(record.dob)
)
);
})
}).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...)
}table, th, td {
border: 1px solid #ddd;
border-collapse: collapse;
padding: 10px;
}
.parent {
height: 25%;
width: 90%;
padding: 1%;
margin-left: 1%;
margin-top: 1%;
border: 1px solid black;
}
.parent:nth-child(odd){
background: skyblue;
}
.parent:nth-child(even){
background: green;
}
label {
float: left;
width: 80px;
}
input {
width: 130px;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button onclick="userList(0)">Create Table</button>
<table id="datatable">
<tr><th>Select</th><th>Name</th><th>DOB</th></tr>
</table>
<button onclick="saveData()">Save Selected</button>
<br />
<div class="container"></div>
<button onclick="logSavedData()">Get Saved Data</button>
<button id="showExtForm-btn">Open External Form</button>
<div id="extUser" style="display:none">
<form id="extUserForm">
<p>
<label for="name">Name:</label>
<input type="text" id="name" required>
</p>
<br />
<p>
<label for="myImg">Image:</label>
<input type="url" id="myImg" required>
</p>
<br />
<p>
<label for="dob">DOB:</label>
<input type="date" id="dob" required>
</p>
<br />
<button>Submit</button>
</form>
</div>【问题讨论】：
-
您的 URL 参数
results不是确定页面（第一条记录），而是确定要返回的记录数。对于设置记录的第一个数字，您还有其他论据吗？ -
你怎么知道你的最后一页是什么？你有记录数吗？来自服务器的特定响应？
标签： javascript jquery dynamic pagination