0Wordpress LogoVergrößertes Bild bei Mauszeiger in WordPress anzeigen

Als Teil der jüngsten Verbesserungen, die ich an verschiedenen Websites vorgenommen habe, wollte ich Bilder in Galerien vergrößern, wenn sie mit der Maus darüber bewegt werden. Mach das mit Basic CSS ist ziemlich trivial, aber ich wollte nicht nur das Originalbild erweitern, Ich wollte, dass der Browser ein neues schnappt (größer) Bild auch…

All of the images are already provid­ing a full src-set so all I needed to do was to use a little jQuery (which is already loaded by word­press any­way) to change the tar­get dis­play size to make the browser pull a lar­ger image. Das Schöne ist, dass die CSS works instantly so you get a lar­ger image using the ori­gin­al file, and then the qual­ity improves a split second later as the high­er res file gets loaded.


Die CSS I used is as fol­lows. Ich habe dies einfach der style.css meines Themes hinzugefügt (or rather child-theme — always a good idea to use one)

dt.gallery-icon a img.size-thumbnail:schweben
verwandeln: Rahmen(3.0);

Anmerkung (1) — the above CSS applies to gal­lery images only. It is unlikely any­one would want this func­tion­al­ity for all images dis­played any­where on the page, but you might want it for the main con­tent sec­tion. You would need to check how your theme struc­tures this, but in my case the main con­tent area is a “sec­tion” so the fol­low­ing code would do the job

Abschnitt.Eintrag-Inhalt p a img.size-thumbnail:schweben
verwandeln: Rahmen(3.0);

Anmerkung (2) — This code applies only to thumb­nail images. For medi­um images you would replace “size-thumb­nail” with “size-medi­um”, and for large with “size-large”.

Anmerkung (3) — Because my thumb­nails are 120x80px I want to increase them to 3x their ori­gin­al size. I already have a cus­tom image size of 360×240 that word­press cre­ates for me that is included in the src-set. For hi-dpi screens there are also even lar­ger image sizes that I have (z.B. 720×480). Cre­at­ing addi­tion­al image sizes in word­press is easy — there are lots of good guides online if you need to do this.

Wenn Sie auf 1,5x oder 2,0x skalieren möchten, ändern Sie einfach die 3.0 wie gewünscht

Die jQuery

Add the fol­low­ing to your (Kind) Skriptdatei des Themes (assum­ing it has one). If it does­n’t have one, cre­ate your own, and ‘enqueue’ it with a cus­tom func­tion in the (Kind) Die Funktionen des Themas.php


  jQuery("dt.gallery-icon a img.size-thumbnail").schweben(Funktion(){
    jQuery(dies).attr("Größen","(maximale Breite: 360px) 100vw, 360px");
    }, Funktion(){
    jQuery(dies).attr("Größen","(maximale Breite: 120px) 100vw, 120px");

  //Wiederholen Sie das obige 5 Zeilen hier für jede unterschiedliche Bildgröße, die Sie ändern möchten


The above code is apply­ing to images with class thumb­nail that are found inside any dt with a gal­lery-icon class — so in oth­er­words — only to images inside the word­press built-in gal­lery struc­ture. On hov­er the max-width is increased from 120 zu 360 (eine 3-fache Erhöhung, um meinem zu entsprechen CSS!), and then the second part of the func­tion restores the ori­gin­al 120 width when the hov­er stops.

Wie bei der CSS oben, you can adjust the num­bers to change how much the image enlarges, und du kannst das ändern dt.gallery-icon a img.size-thumbnail sec­tion to tar­get a dif­fer­ent ele­ment or class depend­ing on which images you want to target.

Stellen Sie Ihr eigenes Skript in die Warteschlange ein

If your theme did­n’t have a script file and you need to enqueue your own add the fol­low­ing to your (Kind) Die Funktionen des Themas.php (assum­ing you called your script file image-zoom.js and saved it in the root folder of the theme)

wp_register_script( 'img-zoom', get_stylesheet_directory_uri() . '/image-zoom.js', Feld( 'jquery' ), '', wahr);
wp_enqueue_script( 'img-zoom' );

Das Obige wird Ihr Skript registrieren, in the foot­er, mak­ing sure it is placed after jquery (so jquery should already be avail­able when it executes)

Bildgrößen hinzufügen

For com­plete­ness here’s how to add cus­tom image sizes to word­press. Wieder, füge dies zu deinem hinzu (Kind) Die Funktionen des Themas.php

add_image_size( 'Viertelbreite', 192, 144, falsch );

Above I’ve added a new image-size called “quarter-width” with a max­im­um width of 192px and a max­im­um height of 144px. Das Bild wird nicht zugeschnitten (daher das Falsche am Ende).

Word­Press will now cre­ate images of this size auto­mat­ic­ally when you upload images (you will need to use a thumb­nail rebuild plu­gin to recre­ate the thumb­nails for already-uploaded images).

This new image size will NOT show up for inser­tion in the edit­or though. To make it avail­able also add the fol­low­ing code to your functions.php

Funktion my_custom_image_sizes( $Größen ) {
    return array_merge( $Größen, Feld(
        'quarter-width' => __('Viertelbreite'),
    ) );

Bestehende Einstellungen respektieren

Eine weitere Sache, die Sie vielleicht tun möchten (to ensure respons­ive images work well) is to cre­ate lar­ger (d.h.. hallo-dpi) thumb­nail sizes that respect the GUI of wheth­er to crop thumb­nails or not. To do that use the code below which as you will see is slightly mod­i­fied from the more basic one above

add_image_size( 'bzw.-Daumen-2x', (get_option( 'thumbnail_size_w' ) == 0 ? 0 : '240'), 160, get_option( 'thumbnail_crop' ) );

Der obige Code prüft auf 2 things — firstly it checks to see if the crop option is set, und wenn es ist, it mir­rors it for our new respons­ive size. Es prüft auch, ob die Breite auf eingestellt ist 0 (d.h.. no max­im­um) in which case our new image will also have no max­im­um either. I called the new image size “resp-thumb-2x” as it is a ‘respons­ive’ copy of the thumb­nail that is twice as large (for hi-dpi screens with double the nor­mal pixel dens­ity). I have also cre­ated a num­ber of oth­er sizes to make a fairly com­plete set.

Note — Since my ori­gin­al thumb­nails were 120×80 I want my new ones to be 240×160 so those are the sizes I have spe­cified (hartcodiert). It would be pos­sible to get both the height and width spe­cified for the ori­gin­al thumb­nail and mul­tiply both by 2 to make this func­tion fully gen­er­ic, but I did­n’t do so when I was devel­op­ing it so I will leave that to you to fig­ure out!

Ein letzter Tipp

Wenn, wie ich, you cre­ate your own full set of new image sizes, you may not want word­press to cre­ate it’s own extra hid­den sizes. In addi­tion to the ori­gin­al image, and the thumb­nail, the medi­um, und das große Bild, word­press also cre­ate a “post-thumb­nail”, a “medi­um-large”, a 1536×1536 and a 2048×2048. These are dis­abled in 2 dif­fer­ent ways…

Um die zu entfernen 1536 und 2048 Bilder ist einfach

remove_image_size( '1536x1536' ); //entferne das 1536 we dont need it
remove_image_size( '2048x2048' ); //entferne das 2048 wir brauchen es nicht

The post-thumb and medi­um-large are slightly more complicated

//remove the built-in medium-large
add_filter('intermediate_image_sizes', Funktion($Größen) {
    return array_diff($Größen, ['mittelgroß']);

//remove the built-in post-thumbnail
add_filter('intermediate_image_sizes', Funktion($Größen) {
    return array_diff($Größen, ['nach-Miniaturansicht']);

Note that remov­ing the post-thumb­nail seems to some­times have strange effects on the image lib­rary in the editor.

Eine letzte letzte Anmerkung

When decid­ing on image sizes (for lar­ger images, less so thumb­nails) you ideally want a size that com­mon aspect ratio images will always res­ize nicely to. For that reas­on I recom­mend the fol­low­ing sizes

GrößeBreiteHöhe (4:3)Höhe (16:9)Höhe (3:2)

Note how the widths spe­cified pro­duce whole num­ber heights for all 3 of the most com­mon aspect ratios. Das bekommst du nicht mit Breiten wie 150 or 200.

Also note the pat­tern in increases. Springen 2 Zeilen in der Tabelle und die Größe verdoppelt sich! Die geraden Reihen (288,576,1152 und 1535) are also 1.5x the pre­vi­ous size so these work well on semi-hi-dpi screens using a 50% dpi-Anstieg. Mit diesem Satz von set 7 sizes you have a good range of usable options for most view­ports AND a good set of respons­ive images that word­press will auto­mat­ic­ally add to the src-set since they will have con­sist­ent aspect ratios with no frac­tions that would lead to qual­ity loss or cropping.

Cur­rently for thumb­nails I tend to either have unlim­ited width allowed OR I hard crop to a fixed 3:2 ratio so I use whole num­ber sizes for thumb­nails but I may even­tu­ally tweak my theme and extend the above sys­tem back­wards by hav­ing options 48px and 96px wide (Beachten Sie, dass es keinen Wert zwischen diesen gibt 2 that would work unfor­tu­nately — and since I use 60px wide mini thumb­nails I haven’t opted to extend back­wards). 72px würde für beide funktionieren 4:3 und 3:2 (und 64px würde funktionieren mit 4:3 und 16:9). Since a major­ity of my images are taken on my dSLR these are typ­ic­ally 3:2 (the same as the aspect ratio of tra­di­tion­al 35mm film) also könnte ich auch diese größe gebrauchen, das würde dann mit den großen Größen ganz nach oben funktionieren, but the lar­ger sizes are not cropped where­as my thumb­nails are — I’m happy for lar­ger images to be both land­scape and por­trait, but I want thumb­nails to typ­ic­ally be land­scape only to fit with my design, so that’s why I haven’t exten­ded back­wards. Hope­fully as more and more logos are avail­able as SVG'S, und einmal JPEG-XL kommt in naher Zukunft im Browser an, vieles wird gelöst.

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