Ady Wicaksono Daily Activities

Here’s the function

function isSpaceOnly(s){
var l = s.length;
var c; for(i = 0; i < l; i++){
   if(s.charAt(i) != ' ' && s.charAt(i) != '\t' && s.charAt(i) != '\n'){
      return false;
   }
 }
 return true;
}

Then you only need to use if that function return true -> meaning blank string including space only string given

Sometimes we create HTML document that contains some checkbox option.Sometime we need to click every checkbox option, so is there quick way for doing this? Off course we can do it easily if there’s “select all” button to click every checkbox option…, so how to do it?

Here’s the example code for doing this

function checkAll(){
	var i = document.f['keycode_id[]'].length;
	if(i == undefined){
		document.f['keycode_id[]'].checked = true;
	}else{
		for(j = 0; j < i; j++){
			document.f['keycode_id[]'][j].checked = true;
		}
	}
}	

function unCheckAll(){
	var i = document.f['keycode_id[]'].length;
	if(i == undefined){
		document.f['keycode_id[]'].checked = false;
	}else{
		for(j = 0; j < i; j++){
			document.f['keycode_id[]'][j].checked = false;
		}
	}
}

With assumption that the document form is “f” and the option chekbox variable name is “keycode_id[]“, otherwise you only need to change it. Next step youonly need to create button with event “onClick” will execute one of those 2 function (select all or deselect all)