我正在使用来自API的大量JSON数据用于D3条形图。我想一次只显示10-20个酒吧。有没有办法使用D3进行分页,还是我需要以另一种方式进行分页(php)?欢迎任何最佳实践或建议。
答案 0 :(得分:7)
我知道这是一个迟到的问题,但也许这仍然可以帮助你。
我会在d3中通过创建第二个数组来创建分页,该数组仅包含您想要在特定时间显示的数据。此切片数组将来自您的主数据数组。通过控制数组切片的位置,可以控制分页。
我在这里创建了一个简单的示例,其中一个长数组分为五栏'页面。
答案 1 :(得分:0)
请仔细阅读这段代码,但是如果你经过我的阻止它是有道理的。我只提出了代码的基本部分。链接:http://bl.ocks.org/pragyandas
var legendCount = data.series.length;
var legendWidth=10; var legendSpacing=6;
var netLegendHeight=(legendWidth+legendSpacing)*legendCount;
var legendPerPage,totalPages,pageNo;
if(netLegendHeight/height > 1){
legendPerPage=Math.floor(height/(legendWidth+legendSpacing));
totalPages=Math.ceil(legendCount/legendPerPage);
pageNo=1;
var startIndex=(pageNo-1)*legendPerPage;
var endIndex=startIndex+legendPerPage;
var seriesSubset=[],colorSubset=[];
for(var i=0;i<data.series.length;i++){
if(i>=startIndex && i<endIndex){
seriesSubset.push(data.series[i]);
colorSubset.push(colors[i]);
}
}
DrawLegendSubset(seriesSubset,colorSubset,legendPerPage,pageNo,totalPages);
}
function DrawLegendSubset(seriesSubset,colorSubset,legendPerPage,pageNo,totalPages){
var legend = svg.selectAll("g.legendg")
.data(seriesSubset)
.enter().append("g")
.attr('class','legendg')
.attr("transform", function (d, i) { return "translate(" + (width-40) + ","+ i*(legendWidth+legendSpacing) +")"; });
legend.append("rect")
.attr("x", 45)
.attr("width", legendWidth)
.attr("height", legendWidth)
.attr("class", "legend")
.style('fill',function(d,i){return colorSubset[i];});
legend.append("text")
.attr("x", 60)
.attr("y", 6)
.attr("dy", ".35em")
.style("text-anchor", "start")
.text(function (d) { return d.name; });
var pageText = svg.append("g")
.attr('class','pageNo')
.attr("transform", "translate(" + (width+7.5) + ","+ (legendPerPage+1)*(legendWidth+legendSpacing) +")");
pageText.append('text').text(pageNo+'/'+totalPages)
.attr('dx','.25em');
var prevtriangle = svg.append("g")
.attr('class','prev')
.attr("transform", "translate(" + (width+5) + ","+ (legendPerPage+1.5)*(legendWidth+legendSpacing) +")")
.on('click',prevLegend)
.style('cursor','pointer');
var nexttriangle = svg.append("g")
.attr('class','next')
.attr("transform", "translate(" + (width+20) + ","+ (legendPerPage+1.5)*(legendWidth+legendSpacing) +")")
.on('click',nextLegend)
.style('cursor','pointer');
nexttriangle.append('polygon')
.style('stroke','#000')
.style('fill','#000')
.attr('points','0,0, 10,0, 5,5');
prevtriangle.append('polygon')
.style('stroke','#000')
.style('fill','#000')
.attr('points','0,5, 10,5, 5,0');
if(pageNo==totalPages){
nexttriangle.style('opacity','0.5')
nexttriangle.on('click','')
.style('cursor','');
}
else if(pageNo==1){
prevtriangle.style('opacity','0.5')
prevtriangle.on('click','')
.style('cursor','');
}
}
function prevLegend(){
pageNo--;
svg.selectAll("g.legendg").remove();
svg.select('.pageNo').remove();
svg.select('.prev').remove();
svg.select('.next').remove();
var startIndex=(pageNo-1)*legendPerPage;
var endIndex=startIndex+legendPerPage;
var seriesSubset=[],colorSubset=[];
for(var i=0;i<data.series.length;i++){
if(i>=startIndex && i<endIndex){
seriesSubset.push(data.series[i]);
colorSubset.push(colors[i]);
}
}
DrawLegendSubset(seriesSubset,colorSubset,legendPerPage,pageNo,totalPages);
}
function nextLegend(){
pageNo++;
svg.selectAll("g.legendg").remove();
svg.select('.pageNo').remove();
svg.select('.prev').remove();
svg.select('.next').remove();
var startIndex=(pageNo-1)*legendPerPage;
var endIndex=startIndex+legendPerPage;
var seriesSubset=[],colorSubset=[];
for(var i=0;i<data.series.length;i++){
if(i>=startIndex && i<endIndex){
seriesSubset.push(data.series[i]);
colorSubset.push(colors[i]);
}
}
DrawLegendSubset(seriesSubset,colorSubset,legendPerPage,pageNo,totalPages);
}