Ajax realizes clicking to load more data pictures (preloading)-JS Tutorial-php.cn

Ajax realizes clicking to load more data pictures (preloading)

青灯夜游

Release： 2018-10-11 17:59:31

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This article will introduce to you how ajax can achieve the effect of clicking to load more data pictures (preloading). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>ajax点击加载更多数据--博客园--勇淘未来</title>
        <script type="text/javascript" src="jquery-1.11.1.min.js"></script>
        <style>
            *{padding:0;margin:0;}
            .box {margin: 100px auto;width: 550px;}
            ul li {width:550px;list-style: none;}
            ul li span{text-align:center;display:block;}
            .clear {clear: both;}
            .load {text-align: center;display: none;margin-top:50px;color:#ccc;}
            .end{display:none;color:#ccc;}
        </style>
    </head>
    <body>
        <div class="box">
            <ul></ul>
            <div class="clear"></div>
            <div class="load">加载中...</div>
            <div class="more" style="text-align: center;margin-top:50px;">
                <button class="btn">查看更多图片</button>
                <div class="end">没有更多了</div>
            </div>
        </div>
        <script>
            var num = 0;
            var start = 0;
            var size = 2;
            $.ajax({
                url: "dataNews.json",
                type: "get",
                success: function(res){
                    var str = "";
                    for(var i = 0;i < 2;i++){
                        str += "<li><img src=" + res[i].img + "><span>"+ res[i].title +"</span></li>";
                    }
                    $(".box ul").append(str);
                },
                error:function(){
                    console.log(errors);
                }
            })
            $(".btn").click(function(){
                $(".load").show();
                setTimeout(function(){
                    $(".load").hide();
                    num++;
                    console.log(num);
                    start = num * size;
                    $.ajax({
                        url:"dataNews.json",
                        type:"get",
                        success:function(res){
                            var sum = res.length;
                            if(start + size > sum) {
                                size = sum - start;
                                $(".btn").css("display","none");
                                $(".end").css("display","block");
                            }
                            var str = "";
                            for(var i = start;i<(start + size);i++) {
                                str += "<li><img src=" + res[i].img + "><span>"+ res[i].title +"</span></li>";
                            }
                            console.log(start + size);
                            $("ul").append(str);
                        }
                    });
                },300)
            }
        )
        </script>
</body>
</html>

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Local test dataNews.json file:

[ {
	"img":"img/sina.jpg","title":"百度音乐1"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐2"
}
, {
	"img":"img/sina.jpg","title":"百度音乐3"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐4"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐5"
}
, {
	"img":"img/sina.jpg","title":"百度音乐6"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐7"
}
, {
	"img":"img/sina.jpg","title":"百度音乐8"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐9"
}
, {
	"img":"img/sina.jpg","title":"百度音乐10"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐11"
}
, {
	"img":"img/sina.jpg","title":"百度音乐12"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐13"
}
, {
	"img":"img/sina.jpg","title":"百度音乐14"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐15"
}
]

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Click on more pictures to load 2 pieces of data. When the data is loaded, it will display "No more"

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