Error passing string variable to method

Question

I'm trying to pass a variable to a google visualisation method but it keeps bombing out with an error if I use a variable but works fine if I type the string. What am I missing here?

This works:

var filterdata = new google.visualization.DataView(data)
filterdata.setRows(
  filterdata.getFilteredRows([{column: 0, value: 'someval'}])
);

This doesn't work:

filteredrows = "[{column: 0, value: 'someval'}]";

var filterdata = new google.visualization.DataView(data)
filterdata.setRows(
  filterdata.getFilteredRows(filteredrows)
);

The error I'm getting is:

"Uncaught Error: columnFilters must be a non-empty array"

EDIT:

I'm trying to build an array / string to pass all the dashboard control states as filter conditions for getfilteredrows(). Below is the code I'm using to build the array. I've also tried to create a string but either way it's not accepted...

control_states = [ctrl1.getState(),ctrl2.getState(),ctrl3.getState()];
var filteredrows = {};
var cnt = 0;
for (var i = 0; i < control_states.length; i++) {
  var picker_state = control_states[i]
  for (var j = 0; j < picker_state.selectedValues.length; j++) {
    filteredrows[cnt] = "column: " + i + ", value: '" + picker_state.selectedValues[j] + "'";
    cnt += 1;
  };
};

Mulan · Accepted Answer · 2013-08-19 07:12:38Z

1

One is JSON, the other is an actual array.

Just write the first line as this

var filteredrows = [{column: 0, value: 'someval'}];

If your filteredrows is actually a string and you can't change that, use JSON.parse on it first

var filterdata = new google.visualization.DataView(data)
filterdata.setRows(
  filterdata.getFilteredRows(JSON.parse(filteredrows))
);

answered Aug 19, 2013 at 7:12

Mulan

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1 Comment

doovers Over a year ago

I tried JSON parse but it still didn't work. I'll edit question to clarify what I'm doing

Krasimir · Accepted Answer · 2013-08-19 07:13:46Z

1

I guess that the method getFilteredRows accepts a valid array and not a string. I'll suggest to use JSON.parse before to send the string. I.e. something like:

filterdata.getFilteredRows(JSON.parse(filteredrows));

answered Aug 19, 2013 at 7:13

Krasimir

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2 Comments

doovers Over a year ago

I edited question to give more info as I tried this and it didn't work

Krasimir Over a year ago

Aha ... I see. Then you should definitely use JSON.parse to convert your string to valid JavaScript object. After that you can pass it to the API's method.

doovers · Accepted Answer · 2013-08-20 05:34:06Z

0

Here is how I solved the problem, thanks to naomik and Krasimir for pointing me in the right direction!

control_states = [ctrl1.getState(),ctrl2.getState(),ctrl3.getState()];

var filteredrows = [ ];
var cnt = 0;
for (var i = 0; i < control_states.length; i++) {
  var picker_state = control_states[i]
  for (var j = 0; j < picker_state.selectedValues.length; j++) {
    filteredrows[cnt] = [ ];
    filteredrows[cnt]["column"] = i;
    filteredrows[cnt]["value"] = picker_state.selectedValues[j];
    cnt += 1;
  };
};

var filterdata = new google.visualization.DataView(data)
filterdata.setRows(
  filterdata.getFilteredRows(filteredrows)
);

answered Aug 20, 2013 at 5:34

doovers

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