In portfolio gallery filtering i try to understand the javascript so hard and still dont get it can anyone explain me why -1 here
filterSelection("all") // Execute the function and show all columns function filterSelection(c) { var x, i; x = document.getElementsByClassName("column"); if (c == "all") c = ""; // Add the "show" class (display:block) to the filtered elements, and remove the "show" class from the elements that are not selected for (i = 0; i < x.length; i++) { w3RemoveClass(x, "show"); if (x.className.indexOf(c) > -1) w3AddClass(x, "show"); }}
35. How To Create a Portfolio Gallery with Filtering.pdf
