javascript - D3 - How to get width of previous elements in Text selection -

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in code below, seek insert 3 strings on screen 1 next other

to so, need calculate screen width of labels have been displayed, highlighted in attr("x",...) line.

how refer previous elements during selection in d3?

references: how refer previous element, how calculate width of text before displaying it

var labels = ['a label', 'another label', 'a third label']  var textitems = svg.append('g')     .selectall('.my_labels_text')     .data(labels)     .enter()     .append("text")     .attr("class", "my_labels_text")     .attr("text-anchor", "left")     .attr("x", function (d, i)   { return <cumulated width of labels displayed>})     .attr("y", 10) // arbitrary y value     .text(function(d) { return d })

if need keep running width count; use variable in outer scope:

<!doctype html>  <html>      <head>      <script data-require="d3@3.5.3" data-semver="3.5.3" src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.3/d3.js"></script>    </head>      <body>      <script>        var labels = ['a label', 'another label', 'a third label'];                var svg = d3.select('body')          .append('svg')          .attr('width', 1000)          .attr('height', 500);          var runningwidth = 10;        var textitems = svg.append('g')            .selectall('.my_labels_text')            .data(labels)            .enter()            .append("text")            .attr("class", "my_labels_text")            .attr("text-anchor", "left")            .text(function(d) { return d })            .attr("y", 10) // arbitrary y value            .attr("x", function (d, i)   {               var thiswidth = this.getcomputedtextlength(),                  rv = runningwidth;              runningwidth += thiswidth;              return rv;            });              </script>    </body>    </html>


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