bootstrap modal垂直居中（简单封装）

1.使用modal 弹出事件方法；

未封装前：

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <link rel="stylesheet" href="css/bootstrap.min.css">

    <script src="js/jquery.min.js"></script>

    <script src="js/bootstrap.js"></script>

</head>

<body>

<button type="button" id="modalBtn" class="btn btn-primary">点击弹出modal</button>

<div class="modal fade" id="myModal">

    <div class="modal-dialog">

        <div class="modal-content">

            <div class="modal-header">

                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>

                <h4 class="modal-title">Modal 标题</h4>

            </div>

            <div class="modal-body">

                <p>内容&hellip;</p>

                <p>内容&hellip;</p>

                <p>内容&hellip;</p>

            </div>

            <div class="modal-footer">

                <button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>

                <button type="button" class="btn btn-primary">确定</button>

            </div>

        </div>

    </div>

</div>

<script type="text/javascript">

    $(function(){

        var $m_btn = $('#modalBtn');

        var $modal = $('#myModal');

        $m_btn.on('click', function(){

            $modal.modal({backdrop: 'static'});

        });

        $modal.on('show.bs.modal', function(){

            var $this = $(this);

            var $modal_dialog = $this.find('.modal-dialog');

            // 关键代码，如没将modal设置为 block，则$modala_dialog.height() 为零

            $this.css('display', 'block');

            $modal_dialog.css({'margin-top': Math.max(0, ($(window).height() - $modal_dialog.height()) / 2) });

        });

    });

</script>

</body>

</html>

封装后：

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <link rel="stylesheet" href="css/bootstrap.min.css">

    <script src="js/jquery.min.js"></script>

    <script src="js/bootstrap.js"></script>

</head>

<body>

<button type="button" id="modalBtn" class="btn btn-primary">点击弹出modal</button>

<div class="modal fade" id="myModal">

    <div class="modal-dialog">

        <div class="modal-content">

            <div class="modal-header">

                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>

                <h4 class="modal-title">Modal 标题</h4>

            </div>

            <div class="modal-body">

                <p>内容&hellip;</p>

                <p>内容&hellip;</p>

                <p>内容&hellip;</p>

            </div>

            <div class="modal-footer">

                <button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>

                <button type="button" class="btn btn-primary">确定</button>

            </div>

        </div>

    </div>

</div>

<script type="text/javascript">

    $(function(){

        $('#myModal').myfunction({

            $m_btn:$('#modalBtn'),  //触发事件元素

            $modal:$('#myModal'),   //响应事件元素

            eventType:'click'     //事件类型

        });

    });

    ;(function ($) {

        $.fn.myfunction=function (options) {

            var defaults={

                $m_btn : $('#modalBtn'),

                $modal : $('#myModal'),

                eventType:'click'

            };

            var setting=$.extend({},defaults,options);

            this.each(function(){

                var my_btn = setting.$m_btn;

                var _modal = setting.$modal;

                var _event = setting.eventType;

                my_btn.on(_event, function(){

                    _modal.modal({backdrop: 'static'});

                });

                _modal.on('show.bs.modal', function(){

                    var $this = $(this);

                    var $modal_dialog = $this.find('.modal-dialog');

                    $this.css('display', 'block');

                    $modal_dialog.css({'margin-top': Math.max(0, ($(window).height() - $modal_dialog.height()) / 2) });

                });

            });

        }

    })(jQuery);

</script>

</body>

</html>

2.修改bootstrap.js 源码；

打开bootstrap.js ctrl+f 找到 modal对应代码：

弹出框出现时，调用的自然是 Modal.prototype.show() 方法，而show 方法中又调用了 that.adjustDialog() 方法：

加上少量代码：

Modal.prototype.adjustDialog = function () {

    var modalIsOverflowing = this.$element[0].scrollHeight > document.documentElement.clientHeight

    this.$element.css({

      paddingLeft:  !this.bodyIsOverflowing && modalIsOverflowing ? this.scrollbarWidth : '',

      paddingRight: this.bodyIsOverflowing && !modalIsOverflowing ? this.scrollbarWidth : ''

    })

    // 是弹出框居中。。。

    var $modal_dialog = $(this.$element[0]).find('.modal-dialog');

    var m_top = ( $(window).height() - $modal_dialog.height() )/2;

    $modal_dialog.css({'margin': m_top + 'px auto'});

  }

然后就实现modal垂直居中了，效果图：

巴特西

bootstrap modal垂直居中（简单封装）

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