分页数字的错误进度

Question

这是我的代码：

var pages = Math.ceil(allItems / itemsPerPage);
var pagesArray = [];
for(var i = 0; i < pages; i++){
    pagesArray.push(i);
}
var show = 3;
var offset = pageCounter + show;
var showPages = pagesArray.slice(pageCounter, offset);
for(var h = 0; h < showPages.length; h++){
    if(pageCounter == showPages[h]){
        selectedPageClass = 'selected';
    }else{
        selectedPageClass = '';
    }
    $(".pagination").append("<a href='#' class='" + selectedPageClass +"'>" + showPages[h] + "</a>");
}

我现在的问题是：如果我有这个数组 ["1","2","3","4","5"]

当我在第“0”页时，第一步应该是：

1(selected) 2 3

这行得通。但比这样继续下去：

2(selected) 3 4

3(selected) 4 5

4(selected) 5

5(selected)

但我想要的是：

1(selected) 2 3

2(selected) 3 4

3(selected) 4 5

3 4(selected) 5

3 4 5(selected)

Answer 1

http://codepen.io/anon/pen/JbBYva

您可以更新顶部的变量，pageCounter 从 0 开始。

//editable variables
var pages = 5;
var pageCounter = 0;
var show = 3;

//calculation 
var pagesArray = [];
for(var i = 1; i <= pages; i++){
    pagesArray.push(i);
}
var offset = pageCounter + show;
var showPages = pagesArray.slice(Math.min(pages - show, pageCounter), offset);
for(var h = 0; h < showPages.length; h++){
    if(pageCounter + 1 == showPages[h]){
        selectedPageClass = 'selected';
    }else{
        selectedPageClass = '';
    }
    $(".pagination").append("<a href='#' class='" + selectedPageClass +"'>" + showPages[h] + "</a>");
}

Answer 2

你应该这样showPages：

var showPages = pagesArray.slice(Math.min(pageCounter, pages- show), offset);

参见下面的演示：

var pages = 10,
  pageCounter = 0;
var pagesArray = [];
for (var i = 0; i < pages; i++) {
  pagesArray.push(i);
}
var show = 3;

function paginate() {
  $(".pagination").empty();
  var offset = pageCounter + show;
  var showPages = pagesArray.slice(Math.min(pageCounter, pages - show), offset);

  for (var h = 0; h < showPages.length; h++) {
    if (pageCounter == showPages[h]) {
      selectedPageClass = 'selected';
    } else {
      selectedPageClass = '';
    }
    $(".pagination").append("<a href='#' class='" + selectedPageClass + "'>" + showPages[h] + "</a>");
  }
}

// initialize
paginate();

// turn pages
$('#counter').click(function() {
  if (pageCounter >= pages)
    return;
  pageCounter++;
  paginate();
});

// restart pagination
$('#restart').click(function() {
  pageCounter = 0;
  paginate();
});

.selected {
  color: red;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="pagination"></div>
<button id="counter">Turn a page</button>
<button id="restart">Restart</button>

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