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EDITING: image_responsive.js

function _image_responsive_test_webp_reel (){
	// Méthode synchrone - mais Firefox ne détecte pas correctement (tant pis pour l'instant…)
    var elem = document.createElement('canvas');

if (!!(elem.getContext && elem.getContext('2d'))) {
        // was able or not to get WebP representation
        if (elem.toDataURL('image/webp').indexOf('data:image/webp') == 0) {
        	if (_lstest()) localStorage.setItem("_image_responsive_test_webp", "oui");
        	return 1;
        } else {
		  var img = new Image();
		  img.onload = function() {if (_lstest()) localStorage.setItem("_image_responsive_test_webp", "oui") };
		  img.onerror = function() {if (_lstest()) localStorage.setItem("_image_responsive_test_webp", "non")};
		  img.src = "data:image/webp;base64,UklGRjIAAABXRUJQVlA4ICYAAACyAgCdASoCAAEALmk0mk0iIiIiIgBoSygABc6zbAAA/v56QAAAAA==";
        }
    }

// very old browser like IE 8, canvas not supported
    return false;
}
var _image_responsive_test_webp_val = "init";
function _image_responsive_test_webp (){
	if (_image_responsive_test_webp_val == "init") {
		if ( _lstest() && localStorage.getItem("_image_responsive_test_webp")) {
			if (localStorage.getItem("_image_responsive_test_webp") == "oui") _image_responsive_test_webp_val = true;
			else _image_responsive_test_webp_val = false;
		} else {
			_image_responsive_test_webp_val = _image_responsive_test_webp_reel();
		}
	}
	return _image_responsive_test_webp_val;
}

function _image_responsive_test_avif_reel (){
	// Méthode synchrone - mais Firefox ne détecte pas correctement (tant pis pour l'instant…)
    var elem = document.createElement('canvas');

if (!!(elem.getContext && elem.getContext('2d'))) {
        // was able or not to get avif representation
        if (elem.toDataURL('image/avif').indexOf('data:image/avif') == 0) {
        	if (_lstest()) localStorage.setItem("_image_responsive_test_avif", "oui");
        	return 1;
        } else {
		  var img = new Image();
		  img.onload = function() {if (_lstest()) localStorage.setItem("_image_responsive_test_avif", "oui") };
		  img.onerror = function() {if (_lstest()) localStorage.setItem("_image_responsive_test_avif", "non")};
		  img.src = "data:;base64,AAAAIGZ0eXBhdmlmAAAAAGF2aWZtaWYxbWlhZk1BMUEAAADybWV0YQAAAAAAAAAoaGRscgAAAAAAAAAAcGljdAAAAAAAAAAAAAAAAGxpYmF2aWYAAAAADnBpdG0AAAAAAAEAAAAeaWxvYwAAAABEAAABAAEAAAABAAABGgAAABwAAAAoaWluZgAAAAAAAQAAABppbmZlAgAAAAABAABhdjAxQ29sb3IAAAAAamlwcnAAAABLaXBjbwAAABRpc3BlAAAAAAAAAAEAAAABAAAAEHBpeGkAAAAAAwgICAAAAAxhdjFDgSAAAAAAABNjb2xybmNseAABAA0ABoAAAAAXaXBtYQAAAAAAAAABAAEEAQKDBAAAACRtZGF0EgAKBzgABpAQ0GkyDx/wZ///+LPw4ITv2bKbYA==";
        }
    }
    return false;
}
var _image_responsive_test_avif_val = "init";
function _image_responsive_test_avif (){
	if (_image_responsive_test_avif_val == "init") {
		if ( _lstest() && localStorage.getItem("_image_responsive_test_avif")) {
			if (localStorage.getItem("_image_responsive_test_avif") == "oui") _image_responsive_test_avif_val = true;
			else _image_responsive_test_avif_val = false;
		} else {
			_image_responsive_test_avif_val = _image_responsive_test_avif_reel();
		}
	}
	return _image_responsive_test_avif_val;
}

function charger_url_image_responsive(this_img) {
	var dPR = window.devicePixelRatio;
		var src = this_img.attr("data-src");
		var l = this_img.attr("data-l");
		var h = this_img.attr("data-h");

if (this_img.hasClass("image_responsive_v")) {
			var vertical = true;
			var dim= parseInt(this_img.parent().height());
		} else {
			var vertical = false;
			var dim= parseInt(this_img.parent().width());
		}
		
		var forcer_zoom = this_img.attr("data-zoom-responsive");
		if (forcer_zoom) dim = dim * forcer_zoom;
		
		var tailles = this_img.attr("data-tailles");
		
		var numdim = [];
		if (tailles) {
			var w_max = 0;
			var taille_max = 0;
			var t = $.parseJSON(tailles.replace(/\\"/g, '"'));
			var changer_w = 1;
			
			var i = 0;
			
			$.each(t, function (index, value) {
				i++;
				value = parseInt(value);
				numdim[value] = i;
				//console.log(value + " " + dim + " " + changer_w);
				if (changer_w == 1) w_max = value;
				if (value >= dim) changer_w = 0;
				//numdim[w_max] = i;
				if (value >= taille_max) taille_max = value;

});			
			 //console.log ("Wmax: "+w_max);
			if (w_max > 0) dim = w_max;
		}
			// console.log ("W: "+dim);

// console.log ("L: "+l);
			
		var autorisees = this_img.attr("data-autorisees");					
		if (autorisees) {
			autorisees = $.parseJSON(autorisees.replace(/\\"/g, '"'));		
		}
		var autorisees_webp = this_img.attr("data-autorisees_webp");					
		if (autorisees_webp) {
			if (_image_responsive_test_webp()) autorisees = $.parseJSON(autorisees_webp.replace(/\\"/g, '"'));		
		}

// Si l'image est trop petite, c'est pas la peine de demander trop grand…
		if (vertical && parseInt(dim) > parseInt(h)) {
			dim = h;
			dpr = false;
		} else if (parseInt(dim) > parseInt(l)) {
			dim = l;
			dpr = false;
		}

if (dim == 0) {
		
		} else {
				if(dPR && dPR > 1) {
					// si l'image d'origine n'est pas nettement plus grande que l'image demandée, 
					// ne pas passer dPR, sinon on récupère image de même taille mais trop compressée
					if (vertical && h < 1.5*dim) dPR = false;
					else if (l < 1.5*dim) dPR = false;
					// forcer à 2
					else dPR = 2;
				} else {
					dPR = false;
				}
				if (autorisees && autorisees[dim]) {
					if (dPR < 1.5) url_img = autorisees[dim][1];
					else url_img = autorisees[dim][2];
				}
				else {				
					if (htactif) {
						racine = src.substr(0, src.length-4);
						terminaison = src.substr(src.length-3, 3);
						var url_img = racine+"-resp"+dim;
						if (vertical) url_img = url_img + "v";
						if (dPR) url_img = url_img + "-"+dPR;
						url_img = url_img + "."+terminaison;
						if (_image_responsive_test_webp()) url_img = url_img + ".webp";
					} else {
						var url_img = "index.php?action=image_responsive&img="+src+"&taille="+dim;
						if (vertical) url_img = url_img + "v";
						if (dPR) url_img = url_img + "&dpr="+dPR;
					}
				}
			this_img.attr("src", url_img).height("").width("").removeAttr("data-top");
		}

}

function charger_url_background_responsive(this_img) {
	var dPR = window.devicePixelRatio;
		vertical = false;

var dim_l= parseInt(this_img.width());
		var dim_h = parseInt(this_img.height());

if (dim_l > dim_h) {	
			var mode = "i";
			var src = this_img.attr("data-italien-src");
			var l = this_img.attr("data-italien-l");
			var h = this_img.attr("data-italien-h");
		} else {
			var mode = "p";
			var src = this_img.attr("data-portrait-src");
			var l = this_img.attr("data-portrait-l");
			var h = this_img.attr("data-portrait-h");
		}
		var mtime = this_img.attr("data-mtime");

if ( (dim_l/dim_h) > (l/h) ) { /* fenetre plus large que l'image */
			dim = dim_l;
		} else {
			dim = dim_h *l / h;
			var pourcent = "auto 100%";
		}
				
		var tailles = this_img.attr("data-tailles");
							
		if (tailles) {
			var w_max = 0;
			var t = $.parseJSON(tailles.replace(/\\"/g, '"'));
			var changer_w = 1;
			
			$.each(t, function (index, value) {
				value = parseInt(value);
				//console.log(value + " " + d + " " + changer_w);
				if (changer_w == 1) w_max = value;
				if (value >= dim) changer_w = 0;
			});
			// console.log ("Wmax: "+w_max);
			if (w_max > 0) dim = w_max;
		}

//console.log ("Wapres: "+dim);

} else {
					var url_img = "index.php?action=image_responsive&img="+src+"&taille="+dim;
					if (vertical) url_img = url_img + "v";
					if (dPR) url_img = url_img + "&dpr="+dPR;
					if (mtime) url_img = url_img + "&mtime="+mtime;
				}
			}

if (this_img.attr("data-background-actif") != url_img) {
				this_img.attr("data-background-actif", url_img);
				this_img.css("background-image", "url("+url_img+")");
			}
		}

}

function charger_url_image_responsive_svg(this_img) {
	var dPR = window.devicePixelRatio;
		var src = this_img.attr("data-src");
		var l = this_img.attr("data-l");
		var h = this_img.attr("data-h");

var cl = this_img.attr("class");

if (cl.indexOf("image_responsive_svg_v") > 0) {
			var vertical = true;
			var dim= parseInt(this_img.parent().height());

//console.log("Dimension v: "+dim);

} else {
			var vertical = false;
			var dim= parseInt(this_img.parent().width());
			//console.log("Dimension h: "+dim);
		}
		
		
		var forcer_zoom = this_img.attr("data-zoom-responsive");
		if (forcer_zoom) dim = dim * forcer_zoom;
		
		
		
		var tailles = this_img.attr("data-tailles");
		
		if (tailles) {
			var w_max = 0;
			var t = $.parseJSON(tailles.replace(/\\"/g, '"'));
			var changer_w = 1;
			
			$.each(t, function (index, value) {
				value = parseInt(value);
				// console.log(value + " " + dim + " " + changer_w);
				if (changer_w == 1) w_max = value;
				if (value >= dim) changer_w = 0;
			});
			// console.log ("Wmax: "+w_max);
			if (w_max > 0) dim = w_max;
		}
			// console.log ("W: "+dim);

// console.log ("L: "+l);
			
		var autorisees = this_img.attr("data-autorisees");					
		if (autorisees) {
			autorisees = $.parseJSON(autorisees.replace(/\\"/g, '"'));		
		}

//console.log ("Wapres: "+dim);
		
				
		if (dim == 0) {
		
		} else {
		
				if(dPR && dPR > 1) {
					// si l'image d'origine n'est pas nettement plus grande que l'image demandée, 
					// ne pas passer dPR, sinon on récupère image de même taille mais trop compressée
					if (vertical && h < 1.5*dim) dPR = false;
					else if (l < 1.5*dim) dPR = false;
					// forcer à 2
					else dPR = 2;
					
				} else {
					dPR = false;
				}
								
				if (autorisees && autorisees[dim]) {
					if (dPR < 1.5) url_img = autorisees[dim][1];
					else url_img = autorisees[dim][2];
				}
				else {				
					if (htactif) {
						racine = src.substr(0, src.length-4);
						terminaison = src.substr(src.length-3, 3);
						var url_img = racine+"-resp"+dim;
						if (vertical) url_img = url_img + "v";
						if (dPR) url_img = url_img + "-"+dPR;
						url_img = url_img + "."+terminaison;
					} else {
						var url_img = "index.php?action=image_responsive&img="+src+"&taille="+dim;
						if (vertical) url_img = url_img + "v";
						if (dPR) url_img = url_img + "&dpr="+dPR;
					}
				}
				
			this_img.attr("xlink:href", url_img).height("").width("").removeAttr("data-top");
		}

}

function calculer_top_image_responsive() {
	// Calculer le "top" des images lazy
	$(".lazy, [data-lazy]").each(function() {
		_calculer_top_image_responsive($(this));
	});
	
	charger_image_responsive();
}

function _calculer_top_image_responsive(this_img) {
	var offset = this_img.offset().top;
	this_img.attr("data-top", offset).addClass("lazy");
}

// valeur du scrollTop que l'on peut forcer par un outil externe (notamment skrollr)
var scrollT = false;

function charger_image_lazy() {
	if (scrollT) var sTop = scrollT;
	else var sTop = $(window).scrollTop();
	
	var hauteur = $(window).height();
	
	var limite_haut = sTop - 1.5*hauteur;
	
	var limite_bas = sTop + 1.5*hauteur;

$(".image_responsive.lazy[data-top]").each(function() {
		this_img = $(this);
		var h = this_img.attr("data-top");
		if (h <= limite_bas && h >= limite_haut) {
			charger_url_image_responsive(this_img);
		} else {// sinon remettre l'image d'origine (rien ou basse def)
			this_img.attr("src", this_img.attr("data-src-lazy"));
		}
	});	
	$(".image_responsive_svg.lazy[data-top]").each(function() {
		this_img = $(this);
		var h = this_img.attr("data-top");
		if (h <= limite_bas && h >= limite_haut) {
			charger_url_image_responsive_svg(this_img);
		} else {// sinon remettre l'image d'origine (rien ou basse def)
			this_img.attr("src", this_img.attr("data-src-lazy"));
		}
	});	
	$("[data-responsive=background].lazy[data-top]").each(function() {
		this_img = $(this);
		var h = this_img.attr("data-top");
		if (h <= limite_bas && h >= limite_haut) charger_url_background_responsive(this_img);
	});	
}

function _charger_image_responsive () {

$("[data-zoom-responsive]").each(function() {
		var forcer_zoom = $(this).attr("data-zoom-responsive");
		if (forcer_zoom > 1) $(this).find(".image_responsive").attr("data-zoom-responsive", forcer_zoom);
	});

// Remplacer les URL non lazy
	// Cacher l'ensemble puis tout réafficher, pour éviter un repaint pour chaque image
	var t = $(".image_responsive:not('.lazy'):not('.avec_picturefill')");
	if (t.length > 20) t.hide();
	t.each(function() {
		charger_url_image_responsive($(this));
	});
	if (t.length > 20) t.show();
	
	$(".image_responsive_svg:not('.lazy')").each(function() {
		charger_url_image_responsive_svg($(this));
	});
	charger_image_lazy();

$("[data-responsive=background]:not('.lazy')").each(function() {
			charger_url_background_responsive($(this));
	});
}

$(document).ready(calculer_top_image_responsive);
$(window).smartresize(calculer_top_image_responsive);
$(window).on("load",calculer_top_image_responsive);
$(document).on("ajaxComplete", calculer_top_image_responsive);

$(window).on("scroll", charger_image_responsive);
	
var didScroll_image_responsive = false

function charger_image_responsive() {
	didScroll_image_responsive = true;
}

function render_image_responsive() {
    if(didScroll_image_responsive) {
		didScroll_image_responsive = false;
		_charger_image_responsive()
    }
}

(function animloop_image_responsive(){
  requestAnimationFrame(animloop_image_responsive);
  render_image_responsive();
})();

CANCEL

Name	Type	Size	Modified	Actions
↩ ..	DIR	—	—
📄 image_responsive.js	JS	15 KB	2025-11-12 11:56	EDIT
📄 jquery.smartresize.js	JS	787 B	2025-11-12 11:56	EDIT
📄 picturefill.js	JS	43.6 KB	2025-11-12 11:56	EDIT
📄 rAF.js	JS	1.2 KB	2025-11-12 11:56	EDIT