javascript - 修复 javascript 的分页限制

Question

首先，需要说明的是，我是 javascript 和 jquery 的新手。 现在，我正在使用 javascript 文件在 div 内分页。该脚本工作正常，但如果有大量数据，那么我需要使用“下一个”和“上一个”标签限制分页链接。我找不到办法做到这一点。目前分页脚本显示所有数字，如 1 2 3 4 5 6 7 8 9等等取决于提供的数据。但是，我想向他们展示，1 2 3 4 5 next>>或者，<<prev 2 3 4 5 6 next>>

这是我的 pagination.js

var Imtech = {};
Imtech.Pager = function() {
    this.paragraphsPerPage = 3;
    this.currentPage = 1;
    this.pagingControlsContainer = "#pagingControls";
    this.pagingContainerPath = "#content";

    this.numPages = function() {
        var numPages = 0;
        if (this.paragraphs != null && this.paragraphsPerPage != null) {
            numPages = Math.ceil(this.paragraphs.length / this.paragraphsPerPage);
        }

        return numPages;
    };

    this.showPage = function(page) {
        this.currentPage = page;
        var html = "";
        for (var i = (page-1)*this.paragraphsPerPage; i < ((page-1)*this.paragraphsPerPage) + this.paragraphsPerPage; i++) {
            if (i < this.paragraphs.length) {
                var elem = this.paragraphs.get(i);
                html += "<" + elem.tagName + ">" + elem.innerHTML + "</" + elem.tagName + ">";
            }
        }

        $(this.pagingContainerPath).html(html);

        renderControls(this.pagingControlsContainer, this.currentPage, this.numPages());
    }

    var renderControls = function(container, currentPage, numPages) {
        var pagingControls = "<b>Pages</b>: <ul>";
        for (var i = 1; i <= numPages; i++) {
            if (i != currentPage) {
                pagingControls += "<li><a href='#' onclick='pager.showPage(" + i + "); return false;'>" + i + "</a></li>";
            } else {
                pagingControls += "<li>" + i + "</li>";
            }
        }

        pagingControls += "</ul>";

        $(container).html(pagingControls);
    }
}

要获得所需的外观，我该如何编辑此脚本？如果有人可以帮助我，请这样做。

Answer 1

您可以像这样更改 renderControls:

var renderControls = function(container, currentPage, numPages, pagesCutoff) {
    var pagingControls = "<b>Pages</b>: <ul>";
    var prevPosition = currentPage - pagesCutoff;
    var nextPosition = currentPage + pagesCutoff;

    for (var i = 1; i <= numPages; i++) {
        if (i != currentPage) {                
            if(i >= prevPosition && i <= nextPosition) {
                var linkToPage = i == prevPosition ? currentPage - 1 : i == nextPosition ? currentPage + 1 : i;
                var linkText = i == prevPosition ? "<< prev" : i == nextPosition ? "next >>" : i;

                pagingControls += "<li><a href='#' onclick='pager.showPage(" + linkToPage + "); return false;'>" + linkText + "</a></li>";
            }
        } else {
            pagingControls += "<li>" + i + "</li>";
        }
    }

    pagingControls += "</ul>";

    $(container).html(pagingControls);
}

并将其添加到 Imtech.Pager:this.pageLinksEachSide = 3;

并将 renderControls 调用更改为:renderControls(this.pagingControlsContainer, this.currentPage, this.numPages(), this.pageLinksEachSide);

假设您希望“下一个”链接导航到 currentPage + 1，“上一个”链接导航到 currentPage - 1。