Hide Next button in n seconds

Challenge

In order to not allow respondent click on the Next button in a period of t
As a questionnaire creator
I want to hide the Next button in some seconds 

Solution

• In questionnaire template editor, choose the question I want to hide the Next button, and then go to the Properties - Edit question properties - Language dependent - Select javascript property 
• Create a onInit() function.
• In that function, check if the Next button existed. 
• If it doesn't exist, do nothing, else disable the Next button, set the time out to number of seconds I want to hide the button, then show the button again.  

Code

<source lang="javascript"> var SingleQuestion = { onInit: function(_label, _text, _answerOptionValues, _answerOptionTexts, _selectedValue) { this.label = "QUESTION." + _label; this.text = _text; this.aoValues = _answerOptionValues; this.aoTexts = _answerOptionTexts; this.selectedValue = _selectedValue; }, getHTML: function() { var n = this.aoValues.length; var list = $("<select>").width("400px"); var selected=""; for(var i=0; i<n; i++) { if (this.aoValues[i] == this.selectedValue) selected = "true"; else selected = ""; list.append($("<option>") .val(this.aoValues[i]) .text(this.aoTexts[i]) .attr("selected", selected) ); }

               //handle change event to change the value of the single question

list.change( function() { $("input:hidden").each( function(i) { if ($(this).attr("name") == SingleQuestion.label) $(this).val(list.val());

} );

} ); var row = $("<tr>"); row.append($("<td>").text(this.text).addClass("grid_subquestion_text grid_subquestion_odd")); row.append( $("<td>").addClass("grid_subquestion_odd") .append(list) ) row.append($("<input type = \"hidden\">").attr("name", this.label).val(""));

return row; } }

quest.onInit = function() { var n = 8; var aoValues = new Array(n); var aoTexts = new Array(n); for (var i=0; i<n; i++) { aoValues[i] = i+1; }

       //answer option texts

aoTexts[0] = "Ejer"; aoTexts[1] = "Adm. direktør"; aoTexts[2] = "Økonomichef"; aoTexts[3] = "Personalechef"; aoTexts[4] = "Bogholder / økonomimedarbejder"; aoTexts[5] = "Medhjælpende ægtefælle"; aoTexts[6] = "Andet, notér på næste side"; aoTexts[7] = "Ved ikke";

       //get the previous selected value

var single_selectedValue = "Template:Q3x.Value"; SingleQuestion.onInit("Q3x","Titel", aoValues, aoTexts, single_selectedValue);

       //append the single question inside the grid

$(".grid_inner").append(SingleQuestion.getHTML());

$("input:text").width("400px"); } </source>