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方法一:
HTML:
<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal"> Launch demo modal </button> <!-- Modal --> <div class="modal fade" id="myModal" data-backdrop="static" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"> <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">×</span></button> <h4 class="modal-title" id="myModalLabel">Modal title</h4> </div> <div class="modal-body"> ... </div> <div class="modal-footer"> <button type="button" class="btn btn-default" data-dismiss="modal">Close</button> <button type="button" class="btn btn-primary">Save changes</button> </div> </div> </div> </div>
JavaScript:
// Do like this for more best user experience, // But you have to remove dialog "fade" class(Used animation) $("[role=‘dialog‘]").on("shown.bs.modal", function() { var $modalDialog = $(this).find(".modal-dialog"), $modalBody = $(this).find(".modal-body"), dialogHeight = $modalDialog.height(), dialogWidth = $modalDialog.width(), windowHeight = $(window).height(), windowWidth = $(window).width(); // When dialog height greater than window height, // use default margin top value to set dialog position. if (windowHeight < dialogHeight) { // do nothing return; } // When dialog height less than window height, // dialog position set it with vertical center. $modalDialog.css({ "position": "absolute", "top": "50%", "left": "50%", "marginLeft": - ( dialogWidth / 2 ), "marginTop": - ( dialogHeight / 2 ) }); });
注:这种方式最好将fade class去掉,否则会有不好的用户体验
方式二:修改bootstrap.js源码
that.$element .addClass(‘in‘) .attr(‘aria-hidden‘, false) that.enforceFocus() /***************************************************************/ var $modalDialog = that.$element.find(".modal-dialog"), dialogHeight = $modalDialog.height(), windowHeight = $(window).height(), // When dialog height greater than window height, // use default margin top value to set dialog position. if (windowHeight < dialogHeight) { // do nothing return; } // Dialog position set it with vertical center. $modalDialog.css({ "marginTop": ( windowHeight - dialogHeight) / 2 }); /**************************************************************/ var e = $.Event(‘shown.bs.modal‘, { relatedTarget: _relatedTarget })
注:块级注释间为增加代码,在bootstrap中722行
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原文地址:http://my.oschina.net/jak/blog/387693