Fill rect with pattern

Question

I am using d3.js for graph. at some point i have to show data with some special part of graph for example if the values is cross some boundary then show that part with filli

Answer 1

To change the color would be simple, just a conditional if statement. Here's an example i've used before:

svg.selectAll("dot")    
        .data(data)                                     
    .enter().append("circle")                               
        .attr("r", 3.5)     
        .style("fill", function(d) {            // <== Add these
            if (d.close >= 50) {return "red"}  // <== Add these
            else    { return "black" }          // <== Add these
        ;})                                     // <== Add these
        .attr("cx", function(d) { return x(d.date); })       
        .attr("cy", function(d) { return y(d.close); });    

To add a pattern would be a little more involved as you first have to add the defs element to your SVG and then add your pattern to it

//first create you SVG or select it
var svg = d3.select("#container").append("svg");

//then append the defs and the pattern
svg.append("defs").append("pattern")
    .attr("width", 5)
    .attr("height", 5);

Answer 2

How about this:

Live Demo

JS

var svg = d3.select("body").append("svg");

svg
  .append('defs')
  .append('pattern')
    .attr('id', 'diagonalHatch')
    .attr('patternUnits', 'userSpaceOnUse')
    .attr('width', 4)
    .attr('height', 4)
  .append('path')
    .attr('d', 'M-1,1 l2,-2 M0,4 l4,-4 M3,5 l2,-2')
    .attr('stroke', '#000000')
    .attr('stroke-width', 1);

svg.append("rect")
      .attr("x", 0)
      .attr("width", 100)
      .attr("height", 100)
      .style("fill", 'yellow');

svg.append("rect")
    .attr("x", 0)
    .attr("width", 100)
    .attr("height", 100)
    .attr('fill', 'url(#diagonalHatch)');

Results