javascriptd3.js进度条(代码片段)

关键词：

//Function to check if the div is visible on the screen
$(function() 
    var loaded = false;
    var oTop = $('#instances').offset().top - window.innerHeight;

    checkPosition();

    $(window).scroll(function()
        checkPosition();
    );

    function checkPosition() 
        var pTop = $('body').scrollTop();
        if( pTop > oTop )
            if(!loaded) 
                loaded = true;
                loadChart();
            
           
      
);
//Data for div
var data = 
   [ "instance": "OpenAM", "progress": 100 , 
     "instance": "OpenDJ", "progress": 90 , 
     "instance": "OpenIDM", "progress": 90 , 
     "instance": "OpenIG", "progress": 80 ];

anchorLeft = d3.select("#instances")

//Bind data for bars
var divLeft = anchorLeft.selectAll("#instances div")
.data(data);

//Add shadow for the bars
divLeft.enter().append("div")
.attr("class", "shadow");

//Create the bars
d3.select("body").selectAll(".shadow")
.append("div")
.attr("class","bar");

//Create the path
d3.select("body").selectAll(".bar")
.append("div")
.attr("class","path");

//Add the pattern for the bars
d3.select("body").selectAll(".path")
.append("div")
.attr("class","pattern");



//Animate the bars when they are both visible on screen
function loadChart()

    var start_val = 0;

    //add the percentage to the progress bar and transition the number
    d3.select("body").selectAll(".pattern")
    .append("div")
    .text(start_val)
    .attr("class", "percentage")
    .transition()
    .delay(function(d, i) 
        return i * 200;
    )
    .duration(1000)
    .style("min-width", function(d, i) 
        return (d.progress * 3)/2 + "px"; 
        console.log(1);
    )
    .tween(".percentage", function(d) 
        var i = d3.interpolateNumber(this.textContent, d.progress),
            prec = (d.progress + "").split("."),
            round = (prec.length > 1) ? Math.pow(10, prec[1].length) : 1;

        return function(t) 
            this.textContent = Math.round(i(t) * round) / round + "%";
            // var p = Math.max(0, d3.precisionFixed(0.05) - 2),
            // f = d3.format("." + p + "%");
        ;
    );
    // $('div .shadow').each(function()
    //     $(this).prepend(document.createTextNode("data.Instance"));
    // );

    //transition the width of the path
    d3.select("body").selectAll(".path")
    .transition()
    .delay(function(d, i) 
        return i * 200;
    )
    .duration(1000)
    .style("width", function(d, i) 
        return d.progress*3 + "px"; 
    );

    //transition between the different colors depending on the value
    d3.select("body").selectAll(".pattern")
    //transition to first color
    .transition()
    .delay(function(d, i) 
        return i * 200;
    )
    .duration(250)
    .style("background-color", function(d) 
        if(d.progress < 40) 
            return "#FB7457";
        
        else 
            return "#FBB272";
        
    )
    //transition to second color
    .transition()
    .delay(function(d, i) 
        return (i * 200) + 250;
    )
    .duration(250)
    .style("background-color", function(d) 
        if(d < 40) 
            return "#FB7457";
        
        else if (d.progress < 60) 
            return "#FBB272";
        
        else 
            return "#FFE584";
        
    )
    //transition to third color
    .transition()
    .delay(function(d, i) 
        return (i * 200) + 500;
    )
    .duration(250)
    .style("background-color", function(d) 
        if(d.progress < 40) 
            return "#FB7457";
        
        else if (d.progress < 60) 
            return "#FBB272";
        
        else if (d.progress < 80) 
            return "#FFE584";
        
        else 
            return "#C9D790";
        
    )
    //transition to fourth color
    .transition()
    .delay(function(d, i) 
        return (i * 200) + 750;
    )
    .duration(250)
    .style("background-color", function(d) 
        if(d.progress < 40) 
            return "#FB7457";
        
        else if (d.progress < 60) 
            return "#FBB272";
        
        else if (d.progress < 80) 
            return "#FFE584";
        
        else  if (d.progress < 100) 
            return "#C9D790";
        
        else 
            return "#7AC191";
        
    );

    //transition the sadow under the progress bar
    d3.select("body").selectAll(".shadow")
    .transition()
    .delay(function(d, i) 
        return i * 200;
    )
    .duration(1000)
    .style("width", function(d, i) 
        return d.progress*3-6 + "px"; 
    );

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