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waiter.js
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waiter.js
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// compute offset position of waiter overlay
function get_offset(element) {
var elementPosition = {};
//set width and height
elementPosition.width = element.offsetWidth;
elementPosition.height = element.offsetHeight;
//calculate element top and left
var _x = element.offsetLeft;
var _y = element.offsetTop;
if(isNaN(_x))
_x = 0;
if(isNaN(_y))
_y = 0;
//set top and left
elementPosition.top = _y;
elementPosition.left = _x;
return elementPosition;
}
// elements to hide on recomputed
var waiter_to_hide = [];
var waiter_to_hide_on_error = [];
var waiter_to_hide_on_silent_error = [];
// show waiter overlay
function show_waiter(id, html, color, to_hide, hide_on_error, hide_on_silent_error){
// declare
var dom,
selector = 'body',
exists = false;
// get parent
if(id !== null)
selector = '#' + id;
dom = document.querySelector(selector);
if(dom == undefined){
console.log("Cannot find", id);
return ;
}
// allow missing for testing
to_hide = to_hide || false;
// add to array
if(to_hide)
waiter_to_hide.push(id);
if(hide_on_error)
waiter_to_hide_on_error.push(id);
if(hide_on_silent_error)
waiter_to_hide_on_silent_error.push(id);
el = get_offset(dom); // get dimensions
if(id === null){
el.height = window.innerHeight;
el.width = window.innerWidth;
}
// force static if position relative
// otherwise overlay is completely off
var pos = window.getComputedStyle(dom, null).position;
if(pos == 'relative')
dom.className += ' staticParent';
// check if overlay exists
dom.childNodes.forEach(function(el){
if(el.className === 'waiter-overlay')
exists = true;
});
if(exists === true){
console.log("waiter on", id, "already exists");
return;
}
hide_recalculate(id);
// create overlay
var overlay = document.createElement("DIV");
// create overlay content
var overlay_content = document.createElement("DIV");
// insert html
overlay_content.innerHTML = html;
overlay_content.classList.add("waiter-overlay-content");
// add styles
overlay.style.height = el.height + 'px';
overlay.style.width = el.width + 'px';
overlay.style.top = el.top + 'px';
overlay.style.left = el.left + 'px';
overlay.style.backgroundColor = color;
overlay.style.position = "absolute";
overlay.style.zIndex = 9999;
overlay.classList.add("waiter-overlay");
//overlay.style.animation = "expand .15s ease-in-out";
// append overlay content in overlay
overlay.appendChild(overlay_content);
// append overlay to dom
dom.appendChild(overlay);
// set input
try {
Shiny.setInputValue(id + "_waiter_shown", true, {priority: 'event'});
}
catch(err) {
console.log("waiter_show_on_load - shiny not connected yet:", err.message);
}
}
function hide_waiter(id){
var selector = 'body';
if(id !== null)
selector = '#' + id;
var dom = document.querySelector(selector);
var overlay = dom.getElementsByClassName("waiter-overlay");
if(overlay.length > 0){
//dom.style.animation = "shrink .15s ease-in-out";
setTimeout(function(){
try {
dom.removeChild(overlay[0]);
} catch {
console.log("error removing waiter from", id)
} finally {
Shiny.setInputValue(id + "_waiter_hidden", true, {priority: 'event'});
}
}, 150)
} else{
console.log("no waiter on", id);
}
}
function update_waiter(id, html){
var selector = 'body';
if(id !== null)
selector = '#' + id;
var dom = document.querySelector(selector);
var overlay = dom.getElementsByClassName("waiter-overlay-content");
if(overlay.length > 0)
overlay[0].innerHTML = html;
else
console.log("no waiter on", id);
}
function hide_recalculate(id){
if(id === null)
return ;
var css = '#' + id + '.recalculating {opacity: 1.0 !important; }',
head = document.head || document.getElementsByTagName('head')[0],
style = document.createElement('style');
style.type = 'text/css';
if (style.styleSheet){
style.styleSheet.cssText = css;
} else {
style.appendChild(document.createTextNode(css));
}
head.appendChild(style);
}
// remove when output receives value
$(document).on('shiny:value', function(event) {
console.log(event);
if(waiter_to_hide.indexOf(event.name) > 0){
hide_waiter(event.name);
}
});
// remove when output errors
$(document).on('shiny:error', function(event) {
if(event.error.type == null && waiter_to_hide_on_error.indexOf(event.name) > 0){
hide_waiter(event.name);
} else if (event.error.type != null && waiter_to_hide_on_silent_error.indexOf(event.name) > 0){
hide_waiter(event.name);
}
});