javascript - d3 limit zoom level for time axis -


my code below zooming on time x-axis. want set limit in between time should zoom in or out i.e. upper limit , lower limit of time. i've tried put boundaries value in zoomed function suggested in d3 graph limited zoom thread. isn't working. 

    var x = d3.time.scale()                    .domain([(start_date), (end_date)])                    .range([0, width]);      var zoom = d3.behavior.zoom()                .x(x)                .on("zoom", zoomed);                                svg = d3.select('#chart'+k)                .append("svg:svg")                .attr('width', width + margin.left + margin.right)                .attr('height', height + margin.top + margin.bottom)                .append("svg:g")                .attr("transform", "translate(" + margin.left + "," + margin.top + ")")                .call(zoom);    function zoomed()                {                                      svg.selectall(".line")                     .remove();                                     makebackground();                                                  svg.select(".x.axis").call(xaxis);                  d3.select(".x.axis.top").call(xaxistop);                           svg.select(".x.grid")                    .call(make_x_axis()                    .ticksize(-height, 0, 0)                    .tickformat(""));                  svg.selectall(".circle-path")                    .remove();                  d3.selectall(".traintag")                    .remove();                  drawpaths();                  drawcircle(x,y,chartbody,traindata[0]);                                 }
have other solution in order set zoom level may next , previous 2 hours. thanks


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