View source for Require only one check for grid question

== Challenge == 
Normally, the grid question require one answer for each sub question to navigate to next question. Now, we want it require only one check for the whole grid.<br>
'''Example'''<br>
[[Image:OneCheckRequired.png ]]
== Solution ==
*Create a grid question
*Add the below script to that question

== Code == 
<source lang="javascript" line="1">
var normalQuestionCheck = questioncheck;

function extendedQuestionCheck()
{
   ErrorMessages.getInstance().clearErrorMessages();//clear old error message
   var valid = false;
   var q_name = "QUESTION." + "GridQuestionLabel";//question's name = "QUESTION." + question label
   var n = $(".grid_inner")[0].rows.length - 1;//number of sub questions

   //check if each answer option for each sub question is checked
   for(var i=0;i<n;i++)
	{
		$("input:checkbox[name='"+q_name+"."+i+"']").each(
			function()
			{
				if($(this).attr("checked"))
					valid = true;				
			}
		);
		if(valid)
		break;
	}
	
   if(!valid) showError(quest.requiredtext);
   return valid;
         
}

function showError(e)
{
   ErrorMessages.getInstance().showErrorMessage(e);
}

questioncheck = extendedQuestionCheck;
</source>
== Source ==
Questionnaire Resource Id on cg.catglobe.com site: 164079 (Question: Q9_Require_only_one_check_for_grid_question)