Ora che l'immagine è pronta, la seconda cosa che dobbiamo fare è creare un semplice file HTML con un link al video che stiamo creando la miniatura per:
http://vimeo.com/8736190" id=preview> Western Norway at sunrise
Next, we need to import jQuery in the head of the page: Then we use jQuery to set the display type (block) the width (500px to match the width of one 'frame' of our image) the height (203px) and the background of our link: ); Finally, we need to set the background so that the correct portion of our image is displayed; each 'frame' is 500px wide, so to show the first frame the x position of the background image should be 0px, to show the second it will be -500px, the third will be -1000px and so forth. Using a mousemove handler function, we can calculate the relative position of the cursor over the element as a percentage; we subtract the element's offset position from the event's pageX (this treats the left edge of the element as 0), then divide by the width of the element. Having done so we calculate the position of the background image by multiplying the percentage position by the total size of the composite image. We need the final result to be multiples of the element width (500px) so we divide the result by that value, round down using Math.floor(), then multiply back up to cancel out the division; if we don't do this the image will simply scroll 1px at a time. We subtract the resulting value from 0 so that all possible values are negative. Then we apply the background-position with CSS: The full script looks like this: );}); Western Norway at sunrise
$(document).ready(function() {$('#preview').css('display', 'block').css('width', 500).css('height', 203).css('background', 'url("our-image.jpg") no-repeat');}
Next, we need to import jQuery in the head of the page: Then we use jQuery to set the display type (block) the width (500px to match the width of one 'frame' of our image) the height (203px) and the background of our link: ); Finally, we need to set the background so that the correct portion of our image is displayed; each 'frame' is 500px wide, so to show the first frame the x position of the background image should be 0px, to show the second it will be -500px, the third will be -1000px and so forth. Using a mousemove handler function, we can calculate the relative position of the cursor over the element as a percentage; we subtract the element's offset position from the event's pageX (this treats the left edge of the element as 0), then divide by the width of the element. Having done so we calculate the position of the background image by multiplying the percentage position by the total size of the composite image. We need the final result to be multiples of the element width (500px) so we divide the result by that value, round down using Math.floor(), then multiply back up to cancel out the division; if we don't do this the image will simply scroll 1px at a time. We subtract the resulting value from 0 so that all possible values are negative. Then we apply the background-position with CSS: The full script looks like this: );}); Western Norway at sunrise
Next, we need to import jQuery in the head of the page: Then we use jQuery to set the display type (block) the width (500px to match the width of one 'frame' of our image) the height (203px) and the background of our link: ); Finally, we need to set the background so that the correct portion of our image is displayed; each 'frame' is 500px wide, so to show the first frame the x position of the background image should be 0px, to show the second it will be -500px, the third will be -1000px and so forth. Using a mousemove handler function, we can calculate the relative position of the cursor over the element as a percentage; we subtract the element's offset position from the event's pageX (this treats the left edge of the element as 0), then divide by the width of the element. Having done so we calculate the position of the background image by multiplying the percentage position by the total size of the composite image. We need the final result to be multiples of the element width (500px) so we divide the result by that value, round down using Math.floor(), then multiply back up to cancel out the division; if we don't do this the image will simply scroll 1px at a time. We subtract the resulting value from 0 so that all possible values are negative. Then we apply the background-position with CSS: The full script looks like this: );}); Western Norway at sunrise
Next, we need to import jQuery in the head of the page: Then we use jQuery to set the display type (block) the width (500px to match the width of one 'frame' of our image) the height (203px) and the background of our link: ); Finally, we need to set the background so that the correct portion of our image is displayed; each 'frame' is 500px wide, so to show the first frame the x position of the background image should be 0px, to show the second it will be -500px, the third will be -1000px and so forth. Using a mousemove handler function, we can calculate the relative position of the cursor over the element as a percentage; we subtract the element's offset position from the event's pageX (this treats the left edge of the element as 0), then divide by the width of the element. Having done so we calculate the position of the background image by multiplying the percentage position by the total size of the composite image. We need the final result to be multiples of the element width (500px) so we divide the result by that value, round down using Math.floor(), then multiply back up to cancel out the division; if we don't do this the image will simply scroll 1px at a time. We subtract the resulting value from 0 so that all possible values are negative. Then we apply the background-position with CSS: The full script looks like this: );}); Western Norway at sunrise
Next, we need to import jQuery in the head of the page: Then we use jQuery to set the display type (block) the width (500px to match the width of one 'frame' of our image) the height (203px) and the background of our link: ); Finally, we need to set the background so that the correct portion of our image is displayed; each 'frame' is 500px wide, so to show the first frame the x position of the background image should be 0px, to show the second it will be -500px, the third will be -1000px and so forth. Using a mousemove handler function, we can calculate the relative position of the cursor over the element as a percentage; we subtract the element's offset position from the event's pageX (this treats the left edge of the element as 0), then divide by the width of the element. Having done so we calculate the position of the background image by multiplying the percentage position by the total size of the composite image. We need the final result to be multiples of the element width (500px) so we divide the result by that value, round down using Math.floor(), then multiply back up to cancel out the division; if we don't do this the image will simply scroll 1px at a time. We subtract the resulting value from 0 so that all possible values are negative. Then we apply the background-position with CSS: The full script looks like this: );}); Western Norway at sunrise
Next, we need to import jQuery in the head of the page: Then we use jQuery to set the display type (block) the width (500px to match the width of one 'frame' of our image) the height (203px) and the background of our link: ); Finally, we need to set the background so that the correct portion of our image is displayed; each 'frame' is 500px wide, so to show the first frame the x position of the background image should be 0px, to show the second it will be -500px, the third will be -1000px and so forth. Using a mousemove handler function, we can calculate the relative position of the cursor over the element as a percentage; we subtract the element's offset position from the event's pageX (this treats the left edge of the element as 0), then divide by the width of the element. Having done so we calculate the position of the background image by multiplying the percentage position by the total size of the composite image. We need the final result to be multiples of the element width (500px) so we divide the result by that value, round down using Math.floor(), then multiply back up to cancel out the division; if we don't do this the image will simply scroll 1px at a time. We subtract the resulting value from 0 so that all possible values are negative. Then we apply the background-position with CSS: The full script looks like this: );}); Western Norway at sunrise
Next, we need to import jQuery in the head of the page: Then we use jQuery to set the display type (block) the width (500px to match the width of one 'frame' of our image) the height (203px) and the background of our link: ); Finally, we need to set the background so that the correct portion of our image is displayed; each 'frame' is 500px wide, so to show the first frame the x position of the background image should be 0px, to show the second it will be -500px, the third will be -1000px and so forth. Using a mousemove handler function, we can calculate the relative position of the cursor over the element as a percentage; we subtract the element's offset position from the event's pageX (this treats the left edge of the element as 0), then divide by the width of the element. Having done so we calculate the position of the background image by multiplying the percentage position by the total size of the composite image. We need the final result to be multiples of the element width (500px) so we divide the result by that value, round down using Math.floor(), then multiply back up to cancel out the division; if we don't do this the image will simply scroll 1px at a time. We subtract the resulting value from 0 so that all possible values are negative. Then we apply the background-position with CSS: The full script looks like this: );}); Western Norway at sunrise
.mousemove(function(e) {var elementWidth = 500;var mousePercent = (e.pageX - this.offsetLeft) / elementWidth;var bgPosition = 0 - Math.floor((mousePercent * 5000) / elementWidth) * elementWidth;$(this).css('background-position', '-' + bgPosition + 'px 0px');});
Next, we need to import jQuery in the head of the page: Then we use jQuery to set the display type (block) the width (500px to match the width of one 'frame' of our image) the height (203px) and the background of our link: ); Finally, we need to set the background so that the correct portion of our image is displayed; each 'frame' is 500px wide, so to show the first frame the x position of the background image should be 0px, to show the second it will be -500px, the third will be -1000px and so forth. Using a mousemove handler function, we can calculate the relative position of the cursor over the element as a percentage; we subtract the element's offset position from the event's pageX (this treats the left edge of the element as 0), then divide by the width of the element. Having done so we calculate the position of the background image by multiplying the percentage position by the total size of the composite image. We need the final result to be multiples of the element width (500px) so we divide the result by that value, round down using Math.floor(), then multiply back up to cancel out the division; if we don't do this the image will simply scroll 1px at a time. We subtract the resulting value from 0 so that all possible values are negative. Then we apply the background-position with CSS: The full script looks like this: );}); Western Norway at sunrise
demo
Next, we need to import jQuery in the head of the page: Then we use jQuery to set the display type (block) the width (500px to match the width of one 'frame' of our image) the height (203px) and the background of our link: ); Finally, we need to set the background so that the correct portion of our image is displayed; each 'frame' is 500px wide, so to show the first frame the x position of the background image should be 0px, to show the second it will be -500px, the third will be -1000px and so forth. Using a mousemove handler function, we can calculate the relative position of the cursor over the element as a percentage; we subtract the element's offset position from the event's pageX (this treats the left edge of the element as 0), then divide by the width of the element. Having done so we calculate the position of the background image by multiplying the percentage position by the total size of the composite image. We need the final result to be multiples of the element width (500px) so we divide the result by that value, round down using Math.floor(), then multiply back up to cancel out the division; if we don't do this the image will simply scroll 1px at a time. We subtract the resulting value from 0 so that all possible values are negative. Then we apply the background-position with CSS: The full script looks like this: );}); Western Norway at sunrise
Conclusione
Ci sono un paio di cose da considerare: in primo luogo, sarebbe possibile impostare una miniatura con centinaia di "fotogrammi", ma mentre ciò porterà ad un'animazione molto fluida, ci vorrà anche molto tempo per caricarsi; in secondo luogo, il rilevamento della posizione del mouse semplicemente non funzionerà su un dispositivo touchscreen, quindi anche se questa tecnica non danneggerà effettivamente l'usabilità su un dispositivo mobile, non otterrai nulla.
Lo scopo di una miniatura è di presentare all'utente maggiori informazioni su cosa si trova all'altra estremità di un collegamento e quando la risorsa a cui si sta collegando è un video, una singola immagine spesso non è abbastanza informazioni. L'estensione della tecnica di sprite CSS è un modo semplice ed efficace per visualizzare in anteprima più di un singolo fotogramma.
Come visualizzi in anteprima i video nelle miniature? Usi più di una singola immagine? Fateci sapere nei commenti.