Refresh data retrieved by a custom function in Google Sheet

问题

I\'ve written a custom Google Apps Script that will receive an id and fetch information from a web service (a price).

I use this script in a spreadsheet, and it works just fine. My problem is that these prices change, and my spreadsheet doesn\'t get updated.

How can I force it to re-run the script and update the cells (without manually going over each cell)?

回答1:

Ok, it seems like my problem was that google behaves in a weird way - it doesn't re-run the script as long as the script parameters are similar, it uses cached results from the previous runs. Hence it doesn't re-connect to the API and doesn't re-fetch the price, it simply returns the previous script result that was cached.

See more info here: https://code.google.com/p/google-apps-script-issues/issues/detail?id=888

and here: Script to summarise data not updating

My solution was to add another parameter to my script, which I don't even use. Now, when you call the function with a parameter that is different than previous calls, it will have to rerun the script because the result for these parameters will not be in the cache.

So whenever I call the function, for the extra parameter I pass "$A$1". I also created a menu item called refresh, and when I run it, it puts the current date and time in A1, hence all the calls to the script with $A$1 as second parameter will have to recalculate. Here's some code from my script:

function onOpen() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet();
  var entries = [{
    name : "Refresh",
    functionName : "refreshLastUpdate"
  }];
  sheet.addMenu("Refresh", entries);
};

function refreshLastUpdate() {
  SpreadsheetApp.getActiveSpreadsheet().getRange('A1').setValue(new Date().toTimeString());
}

function getPrice(itemId, datetime) {
  var headers =
      {
        "method" : "get",
        "contentType" : "application/json",
        headers : {'Cache-Control' : 'max-age=0'}
      };

  var jsonResponse = UrlFetchApp.fetch("http://someURL?item_id=" + itemId, headers);
  var jsonObj = eval( '(' + jsonResponse + ')' );
  return jsonObj.Price;
  SpreadsheetApp.flush();
}

And when I want to put the price of item with ID 5 in a cell, I use the following formula:

=getPrice(5, $A$1)

When I want to refresh the prices, I simply click the "Refresh" -> "Refresh" menu item. Remember that you need to reload the spreadsheet after you change the onOpen() script.

回答2:

I know this is a bit of an old question. But this method doesn't require any user action except making a change.

What I did was similar to tbkn23.

The function I want to re-evaluate has an extra unused parameter, $A$1. So the function call is

=myFunction(firstParam, $A$1)

But in the code the function signature is

function myFunction(firstParam)

Instead of having a Refresh function I've used the onEdit(e) function like this

function onEdit(e)
{
   SpreadsheetApp.getActiveSheet().getRange('A1').setValue(Math.random());
}

This function is triggered whenever any cell in the spreadsheet is edited. So now you edit a cell, a random number is placed in A1, this refreshes the parameter list as tbkn23 suggested, causing the custom function to be re-evaluated.

回答3:

This is very late and I don't know it would be useful but actually there are setting here you can make NOW() update automatically

回答4:

If you're custom function is inside a specific column simply order your spreadsheet by that column.

The ordering forces a refresh of the data which invokes your custom function for all rows of that column at once.

回答5:

This may be a super old thread but may be useful for someone trying to do this, as I was just now.

Working off of Lexi's script as-is, it didn't seem to work anymore with the current Sheets, but if I add the dummy variable into my function as a parameter (no need to actually use it inside the function), it will indeed force google sheets to refresh the page again.

So, declaration like: function myFunction(firstParam,dummy) and then calling it would be as has been suggested. That worked for me.

Also, if it is a nuisance for a random variable to appear on all of your sheets that you edit, an easy remedy to limit to one sheet is as follows:

function onEdit(e)
{
  e.source.getSheetByName('THESHEETNAME').getRange('J1').setValue(Math.random());
}

回答6:

Each time you deploy your web app it uses the same version. That's why it does not update.

Once you made changes go to File-> Manage versions and save new version. New version appears. Then when you deploy choose the the version you want to run

回答7:

If you have written a custom function and used it in your spreadsheet as a formula, then each time you open the spreadsheet or any referencing cell is modified, the formula is recalculated.

If you want to just keep staring at the spreadsheet and want its values to change, then consider adding a timed trigger that will update the cells. Read more about triggers here

来源：https://stackoverflow.com/questions/17341399/refresh-data-retrieved-by-a-custom-function-in-google-sheet

标签

google-apps-script

google-sheets

custom-function