Implement search function in html page using js

Today I will talk about a function that I have been working on in the past few days, which is the search function of the html page. This function is mainly implemented by entering characters in the html search box, and then pressing the previous and next buttons. The matching characters in the query area will automatically be marked with a special style, and then you can continue to press the previous button. The next button will browse the matching characters in order and use another pattern to distinguish the current matching character from other matching characters. Pay with html code!

Style demo:

Code demo:

html

<div class="container" style="z-index: 999" id="searchDiv">
<div class="keyword-search">
查找：
<input id="key" type="text" style="width: 200px;" placeholder="关键词" />
<a href="javascript:void(0);" class="prev" onclick=&#39;wordSearch(1)&#39;><i class="c-icon"></i></a>
<a href="javascript:void(0);" class="next" onclick=&#39;wordSearch()&#39;><i class="c-icon"></i></a>
</div>
</div>

script

    <script>//搜索功能
        var oldKey0 = "";
        var index0 = -1;var oldCount0 = 0;
        var newflag = 0;
        var currentLength = 0;

        function wordSearch(flg) {
            var key = $("#key").val(); //取key值
            if (!key) {
                return; //key为空则退出
            }
            getArray();
            focusNext(flg);

        }

        function focusNext(flg) {
            if (newflag == 0) {//如果新搜索,index清零
                index0 = 0;
            }
            if (!flg) {
                if (oldCount0 != 0) {//如果还有搜索
                    if (index0 < oldCount0) {//左边如果没走完，走左边
                        focusMove(index0);
                        index0++;
                    } else if (index0 == oldCount0) {//都走完了
                        index0 = 0;
                        focusMove(index0);
                        index0++;
                    }
                    else {
                        index0 = 0;//没确定
                        focusMove(index0);
                        index0++;
                    }
                }

            } else {
                if (oldCount0 != 0) {//如果还有搜索
                    if (index0 <= oldCount0 && index0 > 0) {//左边如果没走完，走左边
                        index0--;
                        focusMove(index0);
                    } else if (index0 == 0) {//都走完了
                        index0 = oldCount0;
                        index0--
                        focusMove(index0);
                    }
                }
            }
        }
        function getArray() {
            newflag = 1;
            $(".contrast .result").removeClass("res");
            var key = $("#key").val(); //取key值
            if (!key) {
                oldKey0 = "";
                return; //key为空则退出
            }
            if (oldKey0 != key || $(".current").length != currentLength) {
                //重置
                index0 = 0;
                var index = 0;
                $(".contrast .result").each(function () {
                    $(this).replaceWith($(this).html());
                });
                pos0 = new Array();
                if ($(".contrast-wrap").hasClass("current")) {
                    currentLength = $(".current").length;
                    $(".current .contrast").each(function () {
                        $(this).html($(this).html().replace(new RegExp(key, "gm"), "<span id=&#39;result" + (index++) + "&#39; class=&#39;result&#39;>" + key + "</span>")); // 替换
                    });
                } else {
                    $(".contrast-wrap").addClass(&#39;current&#39;);
                    currentLength = $(".current").length;
                    $(".contrast").each(function () {
                        $(this).html($(this).html().replace(new RegExp(key, "gm"), "<span id=&#39;result" + (index++) + "&#39; class=&#39;result&#39;>" + key + "</span>")); // 替换
                    });
                }
                //$("#key").val(key);
                oldKey0 = key;

                //$(".contrast .result").each(function () {
                //    $(this).parents(&#39;.contrast-wrap&#39;).addClass(&#39;current&#39;);
                //    pos0.push($(this).offset().top);
                //});
                // pos0.push($(".contrast .result:eq(2)").offset().top - $(".contrast .result:eq(2)").parents(".contrast").offset().top);
                oldCount0 = $(".contrast .result").length;
                newflag = 0;
            }
        }
        function focusMove(index0) {
            $(".contrast .result:eq(" + index0 + ")").parents(&#39;.contrast-wrap&#39;).addClass(&#39;current&#39;);
            $(".contrast .result:eq(" + index0 + ")").addClass("res");
            var top = $(".contrast .result:eq(" + index0 + ")").offset().top + $(".contrast .result:eq(" + index0 + ")").parents(".contrast").scrollTop();
            var intop = top - $(".contrast .result:eq(" + index0 + ")").parents(".contrast").offset().top;
            $(".contrast .result:eq(" + index0 + ")").parents(".contrast").animate({ scrollTop: intop }, 200);
            if ($(".contrast .result:eq(" + index0 + ")").parents(".contrast").scrollTop() == 0) {
                $("html, body").animate({ scrollTop: top - 200 }, 200);
            } else {
                $("html, body").animate({ scrollTop: $(".contrast .result:eq(" + index0 + ")").parents(".contrast").offset().top - 200 }, 200);
            }

        }


        $(&#39;#key&#39;).change(function () {
            if ($(&#39;#key&#39;).val() == "") {
                index0 = 0;
                $(".contrast .result").each(function () {
                    $(this).replaceWith($(this).html());
                });
                oldKey0 = "";
            }
        });
    </script>

##Next, note the implementation principle:

First clear the last query results, and then use regular expressions to add a special style to all matching characters in the area based on the key value. For example, a class name is added to the method. For the span tag of result, use the odKey0 variable to record the value of the key (compare first when entering next time. If they are the same, it means you need to look at the next or previous content, so you don’t need to use regular expression matching again). oldCount0 records the total query. The number that comes out, newflag is set to 0 (if it is not the first query, newflag is 1).

Then enter the getNext method. flg indicates whether the user pressed the previous or next button. Use index0 to record which matching character is currently being viewed. Compare it with oldCount0 to determine whether it is incremented or decremented or set to 0 ( If it is greater than oldCount0 or less than 0, it will start again).

The focusMove method is an operation that positions the page to the current element.

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