Remove null value from a number array
+1Hello,
I created a number array as follows:
Qualtrics.SurveyEngine.addOnReady(function()
{
var i1=parseInt("${q://QID1/ChoiceTextEntryValue}");
var i2=parseInt("${q://QID2/ChoiceTextEntryValue}");
var i3=parseInt("${q://QID3/ChoiceTextEntryValue}");
var myArray = [i1, i2, i3];
And I want to randomly select one of these items in the array, so I write:
var randomItem = myArray[Math.floor(Math.random() * myArray.length)];
But the problem is, if one of the three items is null (a respondent skill the question), this does not work.
Could you please tell me how I can remove null item in the array?
Thank you very much.
Hello @jhwang ,
Use the below code:
var i1=parseInt("${q://QID1/ChoiceTextEntryValue}") || -1;
var i2=parseInt("${q://QID2/ChoiceTextEntryValue}") || -1;
var i3=parseInt("${q://QID3/ChoiceTextEntryValue}") || -1;
var myArray = [i1, i2, i3];
myArray= jQuery.grep(myArray, function(value) {
return value != -1;
});
var randomItem = myArray[Math.floor(Math.random() * myArray.length)];
+1Hello @Shashi,
Thank you very much for your code. I think it works for random selection. But I have one additional issue. After the random selection, I want to match another value based on the selected item. So, my code is like:
var i1=parseInt("${q://QID1/ChoiceTextEntryValue}") || -1;
var i2=parseInt("${q://QID2/ChoiceTextEntryValue}") || -1;
var i3=parseInt("${q://QID3/ChoiceTextEntryValue}") || -1;
var myArray = [i1, i2, i3];
myArray= jQuery.grep(myArray, function(value) {
return value != -1;
});
var randomItem = myArray[Math.floor(Math.random() * myArray.length)];
Qualtrics.SurveyEngine.setEmbeddedData("randomItem", randomItem);
var i4="${q://QID4/ChoiceGroup/SelectedChoices}";
var i5="${q://QID5/ChoiceGroup/SelectedChoices}";
var i6="${q://QID6/ChoiceGroup/SelectedChoices}";
var purpose;
if(randomItem = i1){
purpose = i4;
}
else if(randomItem = i2){
purpose = i5;
}
else{
purpose = i6;
}
Qualtrics.SurveyEngine.setEmbeddedData("purpose", purpose);
Finally, in the survey, I want to say like,
"You selected ${e://Field/randomItem} and your purpose was ${e://Field/purpose}."
But with your code, I can see that random selection works, but the latter matching part does not work.
Could you please give me any suggestions?
Thank you very much.
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