【发布时间】：2020-08-19 16:26:10
【问题描述】：
我遇到了与 mozman2 描述的 here 相同的问题：
“在我的 Django 更改列表中有很多列，这意味着列表底部有一个滚动条。是否可以让滚动条出现在顶部，这样我就不需要向下滚动了”
来自给定链接的解决方案似乎对 mozman2 有所帮助。但是，我无法重现它。因此我尝试从
复制粘贴代码https://github.com/avianey/jqDoubleScroll#readme
特别是，我将此文件从存储库复制到 MyApp/static/admin/js/
jquery.doubleScroll.js
文件如下所示：
/*
* @name DoubleScroll
* @desc displays scroll bar on top and on the bottom of the div
* @requires jQuery
*
* @author Pawel Suwala - http://suwala.eu/
* @author Antoine Vianey - http://www.astek.fr/
* @version 0.5 (11-11-2015)
*
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
* Usage:
* https://github.com/avianey/jqDoubleScroll
*/
(function( $ ) {
jQuery.fn.doubleScroll = function(userOptions) {
// Default options
var options = {
contentElement: undefined, // Widest element, if not specified first child element will be used
scrollCss: {
'overflow-x': 'auto',
'overflow-y': 'hidden',
'height': '20px'
},
contentCss: {
'overflow-x': 'auto',
'overflow-y': 'hidden'
},
onlyIfScroll: true, // top scrollbar is not shown if the bottom one is not present
resetOnWindowResize: false, // recompute the top ScrollBar requirements when the window is resized
timeToWaitForResize: 30 // wait for the last update event (usefull when browser fire resize event constantly during ressing)
};
$.extend(true, options, userOptions);
// do not modify
// internal stuff
$.extend(options, {
topScrollBarMarkup: '<div class="doubleScroll-scroll-wrapper"><div class="doubleScroll-scroll"></div></div>',
topScrollBarWrapperSelector: '.doubleScroll-scroll-wrapper',
topScrollBarInnerSelector: '.doubleScroll-scroll'
});
var _showScrollBar = function($self, options) {
if (options.onlyIfScroll && $self.get(0).scrollWidth <= $self.width()) {
// content doesn't scroll
// remove any existing occurrence...
$self.prev(options.topScrollBarWrapperSelector).remove();
return;
}
// add div that will act as an upper scroll only if not already added to the DOM
var $topScrollBar = $self.prev(options.topScrollBarWrapperSelector);
if ($topScrollBar.length == 0) {
// creating the scrollbar
// added before in the DOM
$topScrollBar = $(options.topScrollBarMarkup);
$self.before($topScrollBar);
// apply the css
$topScrollBar.css(options.scrollCss);
$(options.topScrollBarInnerSelector).css("height", "20px");
$self.css(options.contentCss);
var scrolling = false;
// bind upper scroll to bottom scroll
$topScrollBar.bind('scroll.doubleScroll', function() {
if (scrolling) {
scrolling = false;
return;
}
scrolling = true;
$self.scrollLeft($topScrollBar.scrollLeft());
});
// bind bottom scroll to upper scroll
var selfScrollHandler = function() {
if (scrolling) {
scrolling = false;
return;
}
scrolling = true;
$topScrollBar.scrollLeft($self.scrollLeft());
};
$self.bind('scroll.doubleScroll', selfScrollHandler);
}
// find the content element (should be the widest one)
var $contentElement;
if (options.contentElement !== undefined && $self.find(options.contentElement).length !== 0) {
$contentElement = $self.find(options.contentElement);
} else {
$contentElement = $self.find('>:first-child');
}
// set the width of the wrappers
$(options.topScrollBarInnerSelector, $topScrollBar).width($contentElement.outerWidth());
$topScrollBar.width($self.width());
$topScrollBar.scrollLeft($self.scrollLeft());
}
return this.each(function() {
var $self = $(this);
_showScrollBar($self, options);
// bind the resize handler
// do it once
if (options.resetOnWindowResize) {
var id;
var handler = function(e) {
_showScrollBar($self, options);
};
$(window).bind('resize.doubleScroll', function() {
// adding/removing/replacing the scrollbar might resize the window
// so the resizing flag will avoid the infinite loop here...
clearTimeout(id);
id = setTimeout(handler, options.timeToWaitForResize);
});
}
});
}
}( jQuery ));
然后我告诉 django 文件使用
class Media:
js = (
'//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js', # jquery
'js/jquery.doubleScroll.js', # project static folder
)
之后我使用了一个 collectstatic-command：
...
Copying '/MyApp/static/admin/js/jquery.doubleScroll.js'
...
1 static file copied to '/MyApp/static', 123 unmodified.
但是，顶部的水平滚动条不显示。
在github存储库中建议使用双滚动条
$(document).ready(function() {
$('.double-scroll').doubleScroll();
});
我把这个放在哪里？我尝试在同一个 .js-File 上使用它而不是开始
(function( $ ) {
...
};
这也无济于事。
我想我错过了什么？
【问题讨论】：
标签： javascript jquery django