Go语言写的一个渲染分页的工具

分页代码：

package pagination

import (
    "math"
    "strconv"
    "strings"
)

type Pagination struct {
    total int
    page int
    limit int
    num_links int
    url string
    text string
    textFirst ,textLast, textNext, textPrev string
    styleLinks, styleResults string
}

func (p *Pagination) Setup(){
    p.limit = 20;
    p.num_links = 10;
    p.text = "显示 {start} 至 {end} 共 {total} 记录 ({pages} 页)";
    p.textFirst = "首页"
    p.textLast = "末页"
    p.textPrev = "上一页"
    p.textNext = "下一页"
    p.styleLinks = "links"
    p.styleResults = "results"
}

func (p *Pagination) SetUrl(url string){
    p.url = url
}

func (p *Pagination) SetTotal(total int){
    p.total = total
}

func (p *Pagination) SetPage(page int){
    p.page = page
}

func (p *Pagination) SetLimit(limit int){
    p.limit = limit
}

func (p *Pagination) SetNumLinks(num_links int){
    p.num_links = num_links
}

func (p *Pagination) Render() string {

    total := p.total

    var page int
    if p.page < 1 {
        page = 1
    } else {
        page = p.page
    }

    var limit int
    if p.limit <= 0 {
        limit = 10
    } else {
        limit = p.limit
    }

    num_links := p.num_links
    num_pages := int(math.Ceil(float64(total) / float64(limit)))

    var output string

    if page > 1 {
        output += "<a href=\"" + strings.Replace(p.url, "{page}", "1", -1) + p.textFirst + "</a> <a href=\"" + strings.Replace(p.url, "{page}", strconv.Itoa(p.page - 1), -1) + "\">" + p.textPrev + "</a>";

    }

    var start,end int
    if num_pages > 1 {
        if num_pages <= num_links {
            start = 1
            end = num_pages
        } else {
            start = page - int(math.Floor(float64(num_links)/float64(2)))
            end = page + int(math.Floor(float64(num_links)/float64(2)))

            if start < 1 {
                end = int(math.Abs(float64(start))) + 1
                start = 1
            }

            if end > num_pages {
                start -= end - num_pages
                end = num_pages
            }
        }

        if start > 1 {
            output += " .... "
        }

        for i:=start; i <= end ; i++ {
            if page == i {
                output += " <b>" + strconv.Itoa(i) + "</b>"
            } else {
                output += " <a href=\"" + strings.Replace(p.url, "{page}", strconv.Itoa(i), -1) + "\">" + strconv.Itoa(i) + "</a>"
            }
        }

        if end < num_pages {
            output += " .... "
        }
    }

    var text_start,text_end string
    text := p.text
    if page < num_pages {
        output += " <a href=\"" + strings.Replace(p.url, "{page}", strconv.Itoa(page + 1), -1) + "\">" + p.textNext + "</a> <a href=\"" + strings.Replace(p.url, "{page}", strconv.Itoa(num_pages), -1) + "\">" + p.textLast + "</a>"
    }

    if total > 0 {
        text_start = strconv.Itoa((page -1) * limit + 1)
    } else {
        text_start = "0"
    }

    if ((page - 1) * limit) > (total - limit) {
        text_end = strconv.Itoa(total)
    } else {
        text_end = strconv.Itoa(((page - 1) * limit) + limit)
    }

    text = strings.Replace(text, "{start}", text_start, -1)
    text = strings.Replace(text, "{end}", text_end, -1)
    text = strings.Replace(text, "{total}", strconv.Itoa(total) , -1)
    text = strings.Replace(text, "{pages}", strconv.Itoa(num_pages), -1)

    if len(p.styleResults) > 0 {
        if len(output) > 0 {
            output = "<div class=\"" + p.styleLinks + "\">" + output + "</div>"
        } else {
            output = ""
        }
        output += "<div class=\"" + p.styleResults + "\">" + text + "</div>"
    } else {
        if len(output) > 0 {
            output = "<div class=\"" + p.styleLinks + "\">" + output + "</div>"
        } else {
            output = ""
        }
    }

    return output
}

使用方法

package main
import (
    "fmt"
    "github.com/proaholic/tools/pagination"
)
func main(){
    var url = "http://test.loc/index/index?page={page}"
    var page pagination.Pagination
    page.Setup()
    page.SetUrl(url)
    page.SetTotal(5200)
    page.SetPage(18)
    page.SetNumLinks(20)
    fmt.Println(page.Render())
}

输出：