function canUseWebp(){
	let elem=document.createElement('canvas');
	if(!!(elem.getContext&&elem.getContext('2d'))){
		return elem.toDataURL('image/webp').indexOf('data:image/webp')==0;
	}
	return false;
}
window.onload=function(){
	let images=document.querySelectorAll('[data-bg]');
	for(let i=0;i<images.length;i++){
		let image=images[i].getAttribute('data-bg');
		images[i].style.backgroundImage='url('+image+')';
	}
	let isitFirefox=window.navigator.userAgent.match(/Firefox\/([0-9]+)\./);
	let firefoxVer=isitFirefox?parseInt(isitFirefox[1]):0;
	if(canUseWebp()||firefoxVer>=65){
		let imagesWebp=document.querySelectorAll('[data-bg-webp]');
		for(let i=0;i<imagesWebp.length;i++){
			let imageWebp=imagesWebp[i].getAttribute('data-bg-webp');
			imagesWebp[i].style.backgroundImage='url('+imageWebp+')';
		}
	}
};

var char_timeout=50;
var story_timeout=2000;
var placeholders=new Array();
	placeholders[0]='труба';
	placeholders[1]='проточный водонагреватель';
	placeholders[2]='фильтр';
	placeholders[3]='бак';
	placeholders[4]='сифон';
	placeholders[5]='теплый пол';
	placeholders[6]='душевая кабина';
	placeholders[7]='емкость';
	placeholders[8]='горелка';
	placeholders[9]='арматура';
	placeholders[10]='бойлер';
	placeholders[11]='газовый котел';
	placeholders[12]='наcос';
function start_printing(){
	item_count=Number(placeholders.length);
	current_placeholder=-1;
	current_length=0;
	input=$('input[name=search_string]');
	run_printing();
}
function run_printing(){
	var timeout;
	if(current_length==0){
		current_placeholder++;
		current_placeholder=current_placeholder%item_count;
		placeholder=placeholders[current_placeholder].replace(/"/g,'-');
	}
	input.attr('placeholder',placeholder.substring(0,current_length)+current_char());
	if(current_length!=placeholder.length){
		current_length++;
		timeout=char_timeout;
	}
	else{
		current_length=0;
		timeout=story_timeout;
	}
	setTimeout("run_printing()",timeout);
}
function current_char(){
	if(current_length==placeholder.length){
		return "";
	}
	else{
		return "|";
	}
}
start_printing();

$('input[type=number]').keyup(function(){
	var max=parseInt($(this).attr('max'));
	var min=parseInt($(this).attr('min'));
	var val=$(this).val();
	if(val<min){
		$(this).val(min);
	}
	if(val>max){
		$(this).val(max);
	}
});

try{
	var result=JSON.parse(r);
	//...
}
catch(e){
}