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Google Script: Play Sound when a specific cell change the Value

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花落未央
花落未央 2020-12-06 15:10

Situation:

Example Spreadsheet

Sheet: Support
Column: H has the following function \"=IF(D:D>0;IF($B$1>=$G:G;\"Call

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2条回答
  • 心在旅途
    2020-12-06 15:19

    Recursively calling checkCalls() eventually led to errors, when I implemented the main answer given (which is mostly correct and really useful, so thank you!).

    // Note: But the original implementation would work fine for a while - say 90 minutes - then crash. The call that would normally take 1 second would take 300 seconds, and Execution would Halt. It looks like it blew the stack by keeping on recursively calling itself. When moved to a single call of check() with proper exiting of the function, it then worked.

    The console log in Chrome on running the JavaScript, said this: ERR_QUIC_PROTOCOL_ERROR.QUIC_TOO_MANY_RTOS 200

    After much investigation, I worked out a better way of doing it... Which doesn't require recursion (and therefore won't blow the stack).

    Remove this line: // window.setTimeout(checkCalls, 500);

    And use something like this - at the end of your script:

      // This function returns a Promise that resolves after "ms" Milliseconds

        // The current best practice is to create a Promise...
  function timer(ms) {
   return new Promise(res => setTimeout(res, ms));
  }

  
  async function loopthis () { // We need to wrap the loop into an async function for the await call (to the Promise) to work.  [From web: "An async function is a function declared with the async keyword. Async functions are instances of the AsyncFunction constructor, and the await keyword is permitted within them. The async and await keywords enable asynchronous, promise-based behavior to be written in a cleaner style, avoiding the need to explicitly configure promise chains."]
    for (var i = 0; i >= 0; i++) {
      console.log('Number of times function has been run: ' + i);
      checkCalls();
      await timer(3000);
    }
  }


  window.onload = function () {
    loopthis();
  }

</script>
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  • 一整个雨季
    2020-12-06 15:25

    This is a pretty tough problem, but it can be done with a sidebar that periodically polls the H column for changes.

    Code.gs

    // creates a custom menu when the spreadsheet is opened
function onOpen() {
  var ui = SpreadsheetApp.getUi()
    .createMenu('Call App')
    .addItem('Open Call Notifier', 'openCallNotifier')
    .addToUi();

  // you could also open the call notifier sidebar when the spreadsheet opens
  // if you find that more convenient
  // openCallNotifier();
}

// opens the sidebar app
function openCallNotifier() {
  // get the html from the file called "Page.html"
  var html = HtmlService.createHtmlOutputFromFile('Page') 
    .setTitle("Call Notifier");

  // open the sidebar
  SpreadsheetApp.getUi()
    .showSidebar(html);
}

// returns a list of values in column H
function getColumnH() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Support");

  // get the values in column H and turn the rows into a single values
  return sheet.getRange(1, 8, sheet.getLastRow(), 1).getValues().map(function (row) { return row[0]; });
}

    Page.html

    <!DOCTYPE html>
<html>
  <head>
    <base target="_top">
  </head>
  <body>
    <p id="message">Checking for calls...</p>

    <audio id="call">
      <source src="||a URL is best here||" type="audio/mp3">
      Your browser does not support the audio element.
    </audio>

    <script>
    var lastTime = []; // store the last result to track changes

    function checkCalls() {

      // This calls the "getColumnH" function on the server
      // Then it waits for the results
      // When it gets the results back from the server,
      // it calls the callback function passed into withSuccessHandler
      google.script.run.withSuccessHandler(function (columnH) {
        for (var i = 0; i < columnH.length; i++) {

          // if there's a difference and it's a call, notify the user
          if (lastTime[i] !== columnH[i] && columnH[i] === "Call") {
            notify();
          }
        }

        // store results for next time
        lastTime = columnH;

        console.log(lastTime);

        // poll again in x miliseconds
        var x = 1000; // 1 second
        window.setTimeout(checkCalls, x);
      }).getColumnH();
    }

    function notify() {
      document.getElementById("call").play();
    }

    window.onload = function () {
      checkCalls();
    }

    </script>
  </body>
</html>

    Some sources to help:

    • Sidebars and Dialogs
    • Custom Menus
    • Simple Trigger - onOpen
    • `google.script.run.withSuccessHandler(callback).customFunction()
    • Array.prototype.map
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