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POTrouble with the CSS to change start position on a slider
 

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  1. POTrouble with the CSS to change start position on a slider
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    <p>I'm very new to CSS and Javascript, and as a sort of project have been working on a slider that moves in two directions, both horizontally and vertically. I've used <a href="http://css-tricks.com/slider-with-sliding-backgrounds/" rel="nofollow">this guide</a> as a model, and have something that is mostly serviceable. </p> <p>However, I'd like for the slider to 'begin' not at the standard point of origin (that is, the left-most and upper-most slide) but at a different, customizable point--for instance, the horizontal and vertical centermost of the available slides--and nothing I try helps me to do this. I've played around with margins, positions and padding, but everything only messes the slider up. Does anyone have an idea for how I can change the slide that is showing on pageload?</p> <p>Here's the CSS that I have so far:</p> <pre><code> .testprojbody { background-color: black; padding: 0; overflow: hidden; } .slider-holder { width: 98%; height: 665px; border: 2px black solid; background-color: white; float: center; margin-left: 9px; } .slider { width: 987px; height: 610px; overflow: hidden; float:center; margin-top: 25px; border: 2px black solid; margin-left: 35px; } .holder { width: 200%; height: 200%; position: relative; } .slide { float: left; width: 987px; height: 610px; position: relative; } .slider-navright { text-align: center; margin: 310px 0 0 1030px; position: absolute; } .slider-navright a { width: 0; height: 0; display: inline-block; overflow: hidden; text-indent: -9999px; border-top: 40px solid transparent; border-bottom: 40px solid transparent; border-left: 20px solid #999; } .slider-navleft { text-align: center; margin: 310px 0 0 12px; position: absolute; } .slider-navleft a { width: 0; height: 0; display: inline-block; overflow: hidden; text-indent: -9999px; border-top: 40px solid transparent; border-bottom: 40px solid transparent; border-right: 20px solid #999; } .slider-navtop { text-align: center; margin: 2px 0 0 501px; position: absolute; } .slider-navtop a { width: 0; height: 0; display: inline-block; overflow: hidden; text-indent: -9999px; border-left: 40px solid transparent; border-right: 40px solid transparent; border-bottom: 20px solid #999; } .slider-navbot { text-align: center; margin: 642px 0 0 501px; position: absolute; } .slider-navbot a { width: 0; height: 0; display: inline-block; overflow: hidden; text-indent: -9999px; border-left: 40px solid transparent; border-right: 40px solid transparent; border-top: 20px solid #999; } </code></pre> <p>Here's the Javascript, which allows for nav &amp; animation and so on:</p> <pre><code>&lt;script type="text/javascript"&gt; var positionH = 0 var positionV = 0 $(document).ready(function(){ var slider = { el: { slider: $("#slider"), allSlides: $(".slide"), sliderNavRight: $(".slider-navright"), sliderNavLeft: $(".slider-navleft"), sliderNavTop: $(".slider-navtop"), sliderNavBot: $(".slider-navbot"), }, timing: 400, slideWidth: 987, slideHeight: 610, // In this simple example, might just move the // binding here to the init function init: function() { this.bindUIEvents(); }, bindUIEvents: function() { // nav code this.el.sliderNavRight.on("click", "a", function(event) { slider.handleNavRightClick(event, this); }); this.el.sliderNavLeft.on("click", "a", function(event) { slider.handleNavLeftClick(event, this); }); this.el.sliderNavTop.on("click", "a", function(event) { slider.handleNavTopClick(event, this); }); this.el.sliderNavBot.on("click", "a", function(event) { slider.handleNavBotClick(event, this); }); }, handleNavRightClick: function(event, el) { positionH+=1; event.preventDefault(); this.el.slider.animate({ scrollLeft: this.slideWidth * positionH }, this.timing); }, handleNavLeftClick: function(event, el) { positionH-=1; event.preventDefault(); this.el.slider.animate({ scrollLeft: this.slideWidth * positionH }, this.timing); }, handleNavTopClick: function(event, el) { event.preventDefault(); positionV--; this.el.slider.animate({ scrollTop: this.slideHeight * positionV }, this.timing); }, handleNavBotClick: function(event, el) { event.preventDefault(); positionV++; this.el.slider.animate({ scrollTop: this.slideHeight * positionV }, this.timing); }, }; slider.init();}); &lt;/script&gt; &lt;script type="text/javascript"&gt; //arrow functions $(document.documentElement).keydown(function(event){ if (event.keyCode == 39){ //go right event.preventDefault(); $('.slider-navright a') .click(); } else if (event.keyCode == 37){ //go left event.preventDefault(); $('.slider-navleft a') .click(); } else if (event.keyCode == 38){ //go up event.preventDefault(); $('.slider-navtop a') .click(); } else if (event.keyCode == 40){ //go down event.preventDefault(); $('.slider-navbot a') .click(); } }); // makes slider unselectable AND makes arrow nav work better $(".slider").disableSelection(); &lt;/script&gt; </code></pre> <p>and here's the relevant HTML:</p> <pre><code>&lt;body class="testprojbody"&gt; &lt;div class="slider-holder"&gt; &lt;div class="slider" id="slider"&gt; &lt;div class="holder"&gt; &lt;div class="slide" id="slide-x0y0"&gt;&lt;/div&gt; &lt;div class="slide" id="slide-x1y0"&gt;&lt;/div&gt; &lt;div class="slide" id="slide-x0yA"&gt;&lt;/div&gt; &lt;div class="slide" id="slide-x0y0"&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;nav class="slider-navright"&gt; &lt;a href="#"&gt;Move Right&lt;/a&gt; &lt;/nav&gt; &lt;nav class="slider-navleft"&gt; &lt;a href="#"&gt;Move Left&lt;/a&gt; &lt;/nav&gt; &lt;nav class="slider-navtop"&gt; &lt;a href="#"&gt;Move Up&lt;/a&gt; &lt;/nav&gt; &lt;nav class="slider-navbot"&gt; &lt;a href="#"&gt;Move Down&lt;/a&gt; &lt;/nav&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Hope this is comprehensible, as I said, I'm very new (only picked up javascript about two weeks ago, and html maybe a month and a half ago), so I'm sure this is very sloppy, roundabout code. Still, if anyone could help, it would be much appreciated!</p> <p>Thanks.</p>
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