Answers for "javascript get resource api"

javascript get resource api

function calculate_load_times() {
  // Check performance support
  if (performance === undefined) {
    console.log("= Calculate Load Times: performance NOT supported");
    return;
  }

  // Get a list of "resource" performance entries
  var resources = performance.getEntriesByType("resource");
  if (resources === undefined || resources.length <= 0) {
    console.log("= Calculate Load Times: there are NO `resource` performance records");
    return;
  }

  console.log("= Calculate Load Times");
  for (var i=0; i < resources.length; i++) {
    console.log("== Resource[" + i + "] - " + resources[i].name);
    // Redirect time
    var t = resources[i].redirectEnd - resources[i].redirectStart;
    console.log("... Redirect time = " + t);

    // DNS time
    t = resources[i].domainLookupEnd - resources[i].domainLookupStart;
    console.log("... DNS lookup time = " + t);

    // TCP handshake time
    t = resources[i].connectEnd - resources[i].connectStart;
    console.log("... TCP time = " + t);

    // Secure connection time
    t = (resources[i].secureConnectionStart > 0) ? (resources[i].connectEnd - resources[i].secureConnectionStart) : "0";
    console.log("... Secure connection time = " + t);

    // Response time
    t = resources[i].responseEnd - resources[i].responseStart;
    console.log("... Response time = " + t);

    // Fetch until response end
    t = (resources[i].fetchStart > 0) ? (resources[i].responseEnd - resources[i].fetchStart) : "0";
    console.log("... Fetch until response end time = " + t);

    // Request start until response end
    t = (resources[i].requestStart > 0) ? (resources[i].responseEnd - resources[i].requestStart) : "0";
    console.log("... Request start until response end time = " + t);

    // Start until response end
    t = (resources[i].startTime > 0) ? (resources[i].responseEnd - resources[i].startTime) : "0";
    console.log("... Start until response end time = " + t);
  }
}