0वर्डप्रेस में होवर पर बढ़े हुए चित्र दिखाएं

As part of the recent improve­ments I’ve been mak­ing to vari­ous web­sites I wanted to make images in gal­ler­ies show enlarged ver­sions when hovered over. बेसिक के साथ ऐसा करना सीएसएस is fairly trivi­al, but I did­n’t just want to expand the ori­gin­al image, मैं चाहता था कि ब्राउज़र एक नया प्राप्त करे grab (lar­ger) image too…

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. अच्छी बात यह है कि सीएसएस 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.

The सीएसएस

The सीएसएस I used is as fol­lows. मैंने इसे बस अपने विषय के style.css में जोड़ा है (or rather child-theme — always a good idea to use one)

dt.gallery-icon a img.size-थंबनेल:मंडराना
{
परिवर्तन: स्केल(3.0);
}

नोट (1) — the above सीएसएस 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

सेक्शन.एंट्री-कंटेंट p a img.size-थंबनेल:मंडराना
{
परिवर्तन: स्केल(3.0);
}

नोट (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”.

नोट (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 (उदाहरण के लिए:. 720×480). Cre­at­ing addi­tion­al image sizes in word­press is easy — there are lots of good guides online if you need to do this.

यदि आप 1.5x या 2.0x साधारण परिवर्तन करना चाहते हैं तो 3.0 जैसी इच्छा

jQuery

Add the fol­low­ing to your (बच्चा) विषय की स्क्रिप्ट फ़ाइल (assum­ing it has one). If it does­n’t have one, cre­ate your own, and ‘enqueue’ it with a cus­tom func­tion in the (बच्चा) विषय के कार्य।php

jQuery(डाक्यूमेंट).तैयार(समारोह(){

  jQuery("dt.gallery-icon a img.size-थंबनेल").मंडराना(समारोह(){
    jQuery(यह).attr("आकार","(अधिकतम चौड़ाई: 360पिक्सल) 100वीडब्ल्यू, 360पिक्सल");
    }, समारोह(){
    jQuery(यह).attr("आकार","(अधिकतम चौड़ाई: 120पिक्सल) 100वीडब्ल्यू, 120पिक्सल");
  });

  //उपरोक्त दोहराएं 5 प्रत्येक भिन्न छवि आकार के लिए यहाँ पंक्तियाँ जिन्हें आप संशोधित करना चाहते हैं

});

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 तक 360 (my . से मिलान करने के लिए 3x वृद्धि सीएसएस!), and then the second part of the func­tion restores the ori­gin­al 120 width when the hov­er stops.

के साथ के रूप में सीएसएस ऊपर, you can adjust the num­bers to change how much the image enlarges, और आप बदल सकते हैं dt.gallery-icon a img.size-thumbnail sec­tion to tar­get a dif­fer­ent ele­ment or class depend­ing on which images you want to target.

अपनी खुद की स्क्रिप्ट को कतारबद्ध करें

If your theme did­n’t have a script file and you need to enqueue your own add the fol­low­ing to your (बच्चा) विषय के कार्य।php (assum­ing you called your script file image-zoom.js and saved it in the root folder of the theme)

wp_register_script( 'आईएमजी-ज़ूम', get_stylesheet_directory_uri() . '/image-zoom.js', सरणी( 'jquery' ), '', true);
wp_enqueue_script( 'आईएमजी-ज़ूम' );

उपरोक्त आपकी स्क्रिप्ट पंजीकृत करेगा, in the foot­er, mak­ing sure it is placed after jquery (so jquery should already be avail­able when it executes)

छवि आकार जोड़ना

For com­plete­ness here’s how to add cus­tom image sizes to word­press. फिर, इसे अपने में जोड़ें (बच्चा) विषय के कार्य।php

add_image_size( 'चौथाई-चौड़ाई', 192, 144, असत्य );

Above I’ve added a new image-size called “quarter-width” with a max­im­um width of 192px and a max­im­um height of 144px. छवि को क्रॉप नहीं किया जाएगा (इसलिए अंत में असत्य).

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

समारोह my_custom_image_sizes( $आकार ) {
    वापसी array_merge( $आकार, सरणी(
        'quarter-width' => __('तिमाही चौड़ाई'),
    ) );
}

मौजूदा सेटिंग्स का सम्मान करना

एक और काम जो आप करना चाहेंगे (to ensure respons­ive images work well) is to cre­ate lar­ger (अर्थात. उच्च डीपीआई) thumb­nail sizes that respect the जीयूआई 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( 'प्रतिक्रिया-अंगूठे-2x', (get_option( 'थंबनेल_साइज_डब्ल्यू' ) == 0 ? 0 : '240'), 160, get_option( 'थंबनेल_क्रॉप' ) );

उपरोक्त कोड के लिए जाँच करता है 2 things — firstly it checks to see if the crop option is set, और अगर यह है, it mir­rors it for our new respons­ive size. यह यह देखने के लिए भी जांचता है कि क्या चौड़ाई . पर सेट है 0 (अर्थात. 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 (हार्ड कोडित). 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!

एक अंतिम टिप

अगर, मेरे जैसा, 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, और बड़ी छवि, word­press also cre­ate a “post-thumb­nail”, a “medi­um-large”, a 1536×1536 and a 2048×2048. These are dis­abled in 2 dif­fer­ent ways…

हटाने के लिए 1536 तथा 2048 चित्र सीधे-आगे हैं

निकालें_छवि_आकार( '1536x1536' ); //हटाना 1536 we dont need it
remove_image_size( '2048x2048' ); //हटाना 2048 हमें इसकी आवश्यकता नहीं है

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

//remove the built-in medium-large
add_filter('मध्यवर्ती_छवि_आकार', समारोह($आकार) {
    वापसी array_diff($आकार, ['मध्यम बड़ा']);
});

//remove the built-in post-thumbnail
add_filter('मध्यवर्ती_छवि_आकार', समारोह($आकार) {
    वापसी array_diff($आकार, ['पोस्ट-थंबनेल']);
});

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

एक अंतिम अंतिम नोट

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

Note how the widths spe­cified pro­duce whole num­ber heights for all 3 of the most com­mon aspect ratios. आपको वह चौड़ाई के साथ नहीं मिलेगा जैसे 150 or 200.

Also note the pat­tern in increases. कूद 2 तालिका में पंक्तियाँ और आकार दोगुना हो जाता है! सम पंक्तियाँ (288,576,1152 तथा 1535) are also 1.5x the pre­vi­ous size so these work well on semi-hi-dpi screens using a 50% डीपीआई वृद्धि. के इस सेट का उपयोग करके 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 (ध्यान दें कि इनके बीच कोई मूल्य नहीं है 2 that would work unfor­tu­nately — and since I use 60px wide mini thumb­nails I haven’t opted to extend back­wards). 72px दोनों के लिए काम करेगा 4:3 तथा 3:2 (और 64px के साथ काम करेगा 4:3 तथा 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) इसलिए मैं इस आकार का भी उपयोग कर सकता हूं, जो तब बड़े आकार के साथ सभी तरह से काम करेगा, 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 एसवीजीके, और एक बार जेपीईजी-XL निकट भविष्य में ब्राउज़र में आएगा, इसमें से बहुत कुछ हल हो जाएगा.