Report

Instance properties

Report.body Read only Deprecated

The body of the report, which is a ReportBody object containing the detailed report information.

Report.type Read only Deprecated

The type of report generated, e.g., deprecation or intervention.

Report.url Read only Deprecated

The URL of the document that generated the report.

Instance methods

This interface has no methods defined on it.

Events

This interface has no events that fire on it.

Examples

In our deprecation_report.html example, we create a simple reporting observer to observe usage of deprecated features on our web page:

const options = {
  types: ["deprecation"],
  buffered: true,
};

const observer = new ReportingObserver((reports, observer) => {
  reportBtn.onclick = () => displayReports(reports);
}, options);

We then tell it to start observing reports using ReportingObserver.observe(); this tells the observer to start collecting reports in its report queue, and runs the callback function specified inside the constructor:

observer.observe();

Because of the event handler we set up inside the ReportingObserver() constructor, we can now click the button to display the report details.

The report details are displayed via the displayReports() function, which takes the observer callback's reports parameter as its parameter:

function displayReports(reports) {
  const outputElem = document.querySelector(".output");
  const list = document.createElement("ul");
  outputElem.appendChild(list);

  reports.forEach((report, i) => {
    let listItem = document.createElement("li");
    let textNode = document.createTextNode(
      `Report ${i + 1}, type: ${report.type}`,
    );
    listItem.appendChild(textNode);
    let innerList = document.createElement("ul");
    listItem.appendChild(innerList);
    list.appendChild(listItem);

    for (const key in report.body) {
      const innerListItem = document.createElement("li");
      const keyValue = report.body[key];
      innerListItem.textContent = `${key}: ${keyValue}`;
      innerList.appendChild(innerListItem);
    }
  });
}

The reports parameter contains an array of all the reports in the observer's report queue. We loop over each report using a forEach() loop, then iterate over each entry of in the report's body using a for...in structure, displaying each key/value pair inside a list item.

Specifications

Browser compatibility

See also

• Reporting API
• Report-To HTTP header