javascript - slideshow images without plugins and frameworks -
i use following code slideshow , slideshow's performance great website , not intend use code or plugin.
i add 2 features slideshow:
- i want change images automatically after 5 seconds.
- when hold mouse on current image, pausing same image.
please guide me! thanks
if intend change code javascript jquery have no obstacles. code:
var slideindex = 1; showslides(slideindex); function plusslides(n) { showslides(slideindex += n); } function currentslide(n) { showslides(slideindex = n); } function showslides(n) { var i; var slides = document.getelementsbyclassname("myslides"); var dots = document.getelementsbyclassname("dot"); if (n > slides.length) {slideindex = 1} if (n < 1) {slideindex = slides.length} (i = 0; < slides.length; i++) { slides[i].style.display = "none"; } (i = 0; < dots.length; i++) { dots[i].classname = dots[i].classname.replace(" active", ""); } slides[slideindex-1].style.display = "block"; dots[slideindex-1].classname += " active"; }* {box-sizing:border-box} body {font-family: verdana,sans-serif;margin:0} .myslides {display:none} /* slideshow container */ .slideshow-container { max-width: 1000px; position: relative; margin: auto; } /* next & previous buttons */ .prev, .next { cursor: pointer; position: absolute; top: 50%; width: auto; padding: 16px; margin-top: -22px; color: white; font-weight: bold; font-size: 18px; transition: 0.6s ease; border-radius: 0 3px 3px 0; } /* position "next button" right */ .next { right: 0; border-radius: 3px 0 0 3px; } /* on hover, add black background color little bit see-through */ .prev:hover, .next:hover { background-color: rgba(0,0,0,0.8); } /* caption text */ .text { color: #f2f2f2; font-size: 15px; padding: 8px 12px; position: absolute; bottom: 8px; width: 100%; text-align: center; } /* number text (1/3 etc) */ .numbertext { color: #f2f2f2; font-size: 12px; padding: 8px 12px; position: absolute; top: 0; } /* dots/bullets/indicators */ .dot { cursor:pointer; height: 13px; width: 13px; margin: 0 2px; background-color: #bbb; border-radius: 50%; display: inline-block; transition: background-color 0.6s ease; } .active, .dot:hover { background-color: #717171; } /* fading animation */ .fade { -webkit-animation-name: fade; -webkit-animation-duration: 1.5s; animation-name: fade; animation-duration: 1.5s; } @-webkit-keyframes fade { {opacity: .4} {opacity: 1} } @keyframes fade { {opacity: .4} {opacity: 1} } /* on smaller screens, decrease text size */ @media screen , (max-width: 300px) { .prev, .next,.text {font-size: 11px} }<!doctype html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> </style> </head> <body> <div class="slideshow-container"> <div class="myslides fade"> <div class="numbertext">1 / 3</div> <img src="https://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%"> <div class="text">caption text</div> </div> <div class="myslides fade"> <div class="numbertext">2 / 3</div> <img src="https://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%"> <div class="text">caption two</div> </div> <div class="myslides fade"> <div class="numbertext">3 / 3</div> <img src="https://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%"> <div class="text">caption three</div> </div> <a class="prev" onclick="plusslides(-1)">❮</a> <a class="next" onclick="plusslides(1)">❯</a> </div> <br> <div style="text-align:center"> <span class="dot" onclick="currentslide(1)"></span> <span class="dot" onclick="currentslide(2)"></span> <span class="dot" onclick="currentslide(3)"></span> </div> <script> </script> </body> </html>
i changed slideshow container div have id rather class since can document.getelementbyid , retrieve particular element rather array if document.getelementbyclassname:
<!doctype html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> </style> </head> <body> <div id="slideshow-container"> <div class="myslides fade"> <div class="numbertext">1 / 3</div> <img src="https://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%"> <div class="text">caption text</div> </div> <div class="myslides fade"> <div class="numbertext">2 / 3</div> <img src="https://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%"> <div class="text">caption two</div> </div> <div class="myslides fade"> <div class="numbertext">3 / 3</div> <img src="https://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%"> <div class="text">caption three</div> </div> <a class="prev" onclick="plusslides(-1)">❮</a> <a class="next" onclick="plusslides(1)">❯</a> </div> <br> <div style="text-align:center"> <span class="dot" onclick="currentslide(1)"></span> <span class="dot" onclick="currentslide(2)"></span> <span class="dot" onclick="currentslide(3)"></span> </div> <script> </script> </body> </html> i added global timer call plusslide function every 5 seconds. use clearinterval on "mouseleave" stop timer. note use clearinterval(timer) had first save setinterval global variable, timer.
var timer = setinterval(function(){plusslides(1)}, 5000 ); var slideindex = 1; showslides(slideindex); function plusslides(n) { showslides(slideindex += n); } function currentslide(n) { showslides(slideindex = n); } function showslides(n) { var i; var slides = document.getelementsbyclassname("myslides"); var dots = document.getelementsbyclassname("dot"); if (n > slides.length) {slideindex = 1} if (n < 1) {slideindex = slides.length} (i = 0; < slides.length; i++) { slides[i].style.display = "none"; } (i = 0; < dots.length; i++) { dots[i].classname = dots[i].classname.replace(" active", ""); } slides[slideindex-1].style.display = "block"; dots[slideindex-1].classname += " active"; } document.getelementbyid("slideshow-container").addeventlistener("mouseover", function(){ clearinterval(timer) }); document.getelementbyid("slideshow-container").addeventlistener("mouseleave", function(){ timer = setinterval(function(){plusslides(1)}, 5000 ); });
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