jQuery 分页 - 页数错误

Question

我正在尝试在 rss 解析器中创建分页功能。快要工作了。只有最后一页是错误的。 See fiddle here 。最后一页显示 11-10。这是为什么？目前提要中有 10 个项目，因此在此示例中应该只有两页，而不是三页 - 并且在第二页上，应隐藏“下一页”按钮。

这是哪里出了问题吗？

if (numEntriesReturned+1-oRssConfig.contempOffset>0 && oRssConfig.contempOffset<100-oRssConfig.maxItems) $('#btnNext').css("display", "block");
    else $('#btnNext').css("display", "none");

Answer 1

几个小时后，我完全重写了脚本。这应该可以使用 Zazar 的 zRSSFeed 插件加载 RSS 提要并对其进行分页。我评论了大多数函数，以便您可以看到并理解正在发生的事情，希望如此!

特点:
轻松选择要显示的“每页提要”。
轻松输入 RSS 源的链接。
下一个和上一个按钮在需要时出现/消失。
在每页上自动显示 Feed 计数。 示例:“1 of 5”

看看这个 Fiddle看看它的实际效果!
有疑问吗？

JQuery 脚本

// Editable Values
var feedlink = 'http://feeds.reuters.com/reuters/oddlyEnoughNews'; // Set Feed Location
var fpp = 4; // Choose how many feeds per page to display (fpp = Feeds Per Page)
var feedview = '#RSSview'; // Choose where to diplay the RSS Feed

// Initial Variables ( Do Not Edit )
var feeds = null; // Variable to hold total feed count
var totalpages = null; // Variable to hold total pages
var currentpage = null; // Variable to hold Current Page being Displayed
var lastpagefeeds = null; // Variable to hold Amount of Feeds on the Last Page
var firstof = null; // Variable to hold First Feed Display - Example: 3 of ?
var lastof = null; // Variable to hold Last Feed Display - Example: ? of 10
var feedoffset = 1; // Set Initial Feed Offset

///////////////////
// RSS Functions //
///////////////////

// Calulate Feed Count Display
function displayfeedcount(){
    // Set 'First Of ???'
    firstof = feedoffset;
    // Set '??? of Last'
    if(currentpage == Math.ceil(totalpages)){ lastof = feeds; }else{ lastof = (firstof + fpp) - 1;}
    $('#offsetDispl').html( firstof + ' of ' + lastof); // Display Feed Count ' First of Last'
}

// Load Initial Feeds on Page 1
function initialfeeds(){
    $(feedview).rssfeed( feedlink , { limit: fpp , offset: 0 }); // Load Initial Set of Feeds
    currentpage = 1; // Set Current Page to 1
    displayfeedcount(); // Trigger the Display of Feedcount - Example: '1 of 5'
}

// Calculate Total Pages
function calculatepages(){
    totalpages = feeds / fpp; // Total Page Calculation
    console.log( 'Total Pages: ' + totalpages); // Log - For Testing Purposes Only - Delete if Desired
    initialfeeds(); // Trigger Initial Display of Feeds
}

// Determine if the NextBtn should be shown on load
function showbuttons(){
    if ( feeds > fpp ){ $('#btnNext').show(); } // Evaluate 'Next Button' Visibility
}

// Determine Total Feed Count
function feedcount() {
    feeds = arguments[1]; // Set Feed Count to Variable 'feeds'
    console.log( 'Total Feeds: ' + feeds ); // Log - For Testing Purposes Only - Delete if Desired
    showbuttons(); // Trigger Initial Button Display
    calculatepages(); // Trigger Total Page Calculation
}

// Function to Show Next Page
function nextpage(){
    currentpage = currentpage + 1; // Set New Current Page
    feedoffset = feedoffset + fpp ; // Set New Feed Offset   
    console.log('Current Page is: ' + currentpage);  // Log - For Testing Purposes Only - Delete if Desired
    console.log('Feed Offset is: ' + feedoffset );  // Log - For Testing Purposes Only - Delete if Desired
    $(feedview).rssfeed( feedlink , { limit: fpp , offset: feedoffset }); // Load Next Set of Feeds
    if( currentpage >= totalpages ){ $('#btnNext').hide();} // Evaluate 'Next Button' Visibility
    if( currentpage > 1){ $('#btnPrev').fadeIn('250');} // Evaluate 'Previous Button' Visibility
    displayfeedcount(); // Display Feed Count ' ??? of ??? '   
}

// Function to Show Previous Page
function prevpage(){
    currentpage = currentpage - 1;  // Set New Current Page
    feedoffset  = feedoffset - fpp ; // Set New Feed Offset
    console.log('Current Page is: ' + currentpage);  // Log - For Testing Purposes Only - Delete if Desired
    console.log('Feed Offset is: ' + feedoffset );  // Log - For Testing Purposes Only - Delete if Desired
    $(feedview).rssfeed( feedlink , { limit: fpp , offset: feedoffset });
    if( currentpage <= totalpages ){ $('#btnNext').fadeIn('250');} // Evaluate 'Next Button' Visibility
    if( currentpage <= 1){ $('#btnPrev').hide();} // Evaluate 'Previous Button' Visibility
    displayfeedcount(); // Display Feed Count ' ??? of ??? '
}

// Bind Previous and Next Button Clicks
$('#btnPrev').on('click', prevpage); // Bind the PrevPage Function
$('#btnNext').on('click', nextpage); // Bind the NextPage Function

// Retrieve Total Feeds
$('#hidden').rssfeed( feedlink , {}, feedcount);
// Make sure this divider exists on the page body >>>  <div id="hidden" style='display:none;'></div>