javascript - Change background image by month -


i'm trying change background image of element, according season is. i'm getting following error:

typeerror: document.getelementsbyclassname(...).style undefined

var currenttime = new date(); var month = currenttime.getmonth() + 1; var total = month;  // summer if (total >= 6 && total <= 8) { document.getelementsbyclassname("banner-container").style.backgroundimage = "url('images/homepage-banners/winter-banner.jpg')"; } // autumn else if (total >= 9 && total <= 11) { document.getelementsbyclassname("banner-container").style.backgroundimage = "url('images/homepage-banners/fall-banner.jpg')"; } // winter else if (total == 12 || total == 1 || total == 2) { document.getelementsbyclassname("banner-container").style.backgroundimage = "url('images/homepage-banners/winter-banner.jpg')"; } // spring else if (total >= 2 && total <= 6) { document.getelementsbyclassname("banner-container").style.backgroundimage = "url('images/homepage-banners/spring-banner.jpg')"; } else { document.getelementsbyclassname("banner-container").style.backgroundimage = "url('images/homepage-banners/summer-banner.jpg')"; }

updated script markup, switching getelementbyid:

<div class="custom banner-container">   <div id="home-banner">      <div class="dmr-welcome">         <img src="/dev/images/homepage-banners/dmr-banner1_07.jpg">       </div>    </div> </div>  var currenttime = new date(); var month = currenttime.getmonth() + 1; var total = month;  // summer if (total >= 6 && total <= 8) { document.getelementbyid("home-banner").style.backgroundimage = "url('images/homepage-banners/winter-banner.jpg')"; } // autumn else if (total >= 9 && total <= 11) { document.getelementbyid("home-banner").style.backgroundimage = "url('images/homepage-banners/fall-banner.jpg')"; } // winter else if (total == 12 || total == 1 || total == 2) { document.getelementbyid("home-banner").style.backgroundimage = "url('images/homepage-banners/winter-banner.jpg')"; } // spring else if (total >= 2 && total <= 6) { document.getelementbyid("home-banner").style.backgroundimage = "url('images/homepage-banners/spring-banner.jpg')"; } else { document.getelementbyid("home-banner").style.backgroundimage = "url('images/homepage-banners/summer-banner.jpg')"; }

error is:

typeerror: document.getelementbyid(...) null document.getelementbyid("home-banner").style.backgroundimage = "url('images/homepage-banners/fall-banner.jpg')";

as noted elclanrs, getelementsbyclassname not you're looking for. looks me want getelementbyid.

also, javascript executing before has reference div you're trying set background image on. try putting script @ bottom of page.

the following worked me. note made changes file names , image path.

<!doctype html> <html> <head> <title></title> </head> <body> <div id="banner-container" style="width:400px;height:300px;"></div>  <script> var currenttime = new date(); var month = currenttime.getmonth() + 1; var total = month;  // summer if (total >= 6 && total <= 8) {     document.getelementbyid("banner-container").style.backgroundimage = "url('images/winter.png')"; } // autumn else if (total >= 9 && total <= 11) {     document.getelementbyid("banner-container").style.backgroundimage="url('images/fall.png')"; } // winter else if (total == 12 || total == 1 || total == 2) {     document.getelementbyid("banner-container").style.backgroundimage = "url('images/winter.png')"; } // spring else if (total >= 2 && total <= 6) {     document.getelementbyid("banner-container").style.backgroundimage = "url('images/spring.png')"; } else {     document.getelementbyid("banner-container").style.backgroundimage = "url('images/summer.png')"; } </script>  </body> </html>

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