perf-cascade

PerfCascade

Extensible waterfall-viewer that works with HAR and other formats (in the future).

Live example at: https://micmro.github.io/PerfCascade/

How to use PerfCascade

PerfCascade is exported with UMD, so you can use it as global object, via AMD (e.g. requireJS) or commonJS (internally it uses ES6 modules).

If using it without any module system it exports as a global object perfCascade, you can use as following:

/** options for PerfCascade (all have defaults) */
var options = {
  rowHeight: 23, //default: 23
  showAlignmentHelpers : true, //default: true
  showIndicatorIcons: true, //default: true
  leftColumnWith: 25 //default: 25
}

/** pass HAR and options to `newPerfCascadeHar` to generate the SVG element*/
var perfCascadeSvg =  perfCascade.fromHar(harData.log, options)

You can find the compiled (and minified) JS in src/dist. Yor the basic version without zHAR support you need perf-cascade.min.js and some basic CSS styles perf-cascade.css.

Options

see options.d.ts for source

rowHeight

number, default: 23 Height of every request bar block plus spacer pixel (in px) default: 23

showAlignmentHelpers

boolean, default: true Show verticale lines to easier spot potential dependencies/blocking between requests

showIndicatorIcons

boolean, default: true Show warning icons for potential issues on the left

leftColumnWith

number default: 25 Relative width of the info column on the left (in percent)

*.zhar - zipped HAR files

By loading /perf-cascade-file-reader.min.js as in this example you can use perfCascadeFileReader.readFile to read a gzip and convert it to a JSON HAR object.

perfCascadeFileReader.readFile(fileFromTheFileInput, fileName, function(data){
  if(!data){
    // handle error
    console.error("Can't read file")
  }else{
    // handle success
    renderPerfCascadeChart(data)
  }
})

Dev

• Start live-reload server and Typescript compiler with watch: npm run watch
• Create uglified version: npm run build (not tracked ITM)
• Build and publish assets to Github Page npm run ghPages (pushes to gh-pages branch) (contributers only)

See package.json for other useful tasks like linting etc.

Specs and ressources

• W3C HAR Spec
• HAR 1.2 Spec
• HAR Resources