jquery globalcss IE 不透明度

Question

我正在使用 jquery globalcss 插件来更改全局样式表。它不处理不透明度和 IE。

我一直在尝试让它正常工作，但运气不佳。这是我强制插件尝试理解 IE 样式不透明度的尝试。

function changeCss (property, value, target) {
    if (property === "opacity") {
        $(target).globalcss("filter","alpha(opacity="+value*100+")");   
        /* For IE 8 (and 9, 10, 11?). Don't miss the added quotes */
        $(target).globalcss("-MS-filter","\"progid:DXImageTransform.Microsoft.Alpha(Opacity="+value*100+")\""); 

    }
    $(target).globalcss(property,value);
}

废话。如果有人可以提供帮助，那就太好了。谢谢。

我将插件粘贴在这里，因为它不再位于其原始站点上:

/*
 * Global Stylesheet jQuery Plugin
 * Version: 0.1
 * 
 * Enables CSS modification that uses a 'global' stylesheet, rather than inline CSS.
 *
 * Copyright (c) 2009 Jeremy Shipman (http://www.burnbright.co.nz)
 * 
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 * 
 * INSTRUCTIONS:
 * use in the same way as the jQuery css function. Eg:
 *  $("some selector").globalcss("style","value");
 *
 * use the globalsetylesheet.print() function to return a string of the global stylesheet
 */
(function($) {

    //global singleton class for 
    globalstylesheet = new function globalStylesheet(){
        if(!document.styleSheets){
            alert("document.Stylesheets not found");
            return false;
        }

        var sheet = null;
        var setrules = Array(); // rule cache

        //set up a dummy noded
        var cssNode = document.createElement('style');
        cssNode.type = 'text/css';
        cssNode.rel = 'stylesheet';
        cssNode.media = 'screen';
        cssNode.title = 'globalStyleSheet';
        document.getElementsByTagName("head")[0].appendChild(cssNode);

        //find the newly created stylesheet and store reference
        for(var i = 0; i < document.styleSheets.length; i++){
            if(document.styleSheets[i].title == "globalStyleSheet"){
                sheet = document.styleSheets[i];
            }
        }

        //set a CSS rule
        this.setRule = function setRule(selector,ruleText){
            if(setrules[selector] != undefined){
                return setrules[selector];
            }else{
                if(sheet.addRule){ // IE
                    sheet.addRule(selector,ruleText,0);
                }else{
                    sheet.insertRule(selector+'{'+ruleText+'}',0);
                }
                setrules[selector] = this.getRule(selector);
            }
            return setrules[selector];
        }

        //get a saved CSS rule
        this.getRule = function getRule(selector){
            if(setrules[selector] != undefined){
                return setrules[selector];
            }else{
                var rules = allRules();
                for(var i = 0; i < rules.length; i++){
                    if(rules[i].selectorText == selector){
                        return rules[i];
                    }
                }
            }
            return false;
        }

        //helper function to get all rules
        function allRules(){
            if(sheet.cssRules){ //IE
                return sheet.cssRules;
            }else{
                return sheet.rules;
            }
        }

        //print out the stylesheet
        this.print = function print(){
            var styleinfo = "";
            var rules = allRules();
            for(var i = 0; i < rules.length; i++){
                styleinfo+= rules[i].cssText+"\n"
            }
            return styleinfo;
        }

        //use jQuery's css selector function to set the style object
        this.css = function css(jquery,key,value){
            rule = this.setRule(jquery.selector,key+":"+value+";");
            jQuery(rule).css(key,value); 
        }
    }

    //hook new function into jQuery
    jQuery.fn.extend({
        globalcss : function globalcss(key,value){
            globalstylesheet.css(this,key,value);
        }
    });

})(jQuery);

编辑:我创建了一个 jsbin 现场演示。请在不同的浏览器中进行比较。 http://jsbin.com/iqadu/edit

Answer 1

更新:

我下面的第一个想法不是问题。事实证明，这个问题要简单得多:确保在小于 1 的 float 前加一个零。也许这是由于 javascript 如何处理字符串值到数字的转换？无论如何，在“.5”之前添加一个零解决了这个问题。

    // works
    var property = "opacity";
    var value = "0.5";
    var target = ".transparency";

    // doesn't work
    var property = "opacity";
    var value = ".5";
    var target = ".transparency";

在这里查看工作代码:http://jsbin.com/ikore3 .顺便说一句，您原来的演示页面有一个 javascript 问题，大括号放在错误的位置。我也解决了这个问题。

以下是导致此问题的最初想法 - 结果证明不是问题

您可能会遇到与 jquery 无关的 IE 怪癖:为了使不透明度起作用，元素必须具有“layout”，这是一个 IE 特定的 bool 状态，由 CSS 触发，例如高度、宽度、缩放等。如果元素没有“布局”，则不透明度将不起作用。

解决方法是向元素添加特定的 CSS，以便为其提供“布局”。不确定这是否是您的情况，但通过添加提供布局的 CSS 属性之一并查看问题是否消失，很容易进行检查。

来自 http://joseph.randomnetworks.com/archives/2006/08/16/css-opacity-in-internet-explorer-ie/ :

But simply setting the filter/opacity value in IE isn’t enough. Turns out that IE requires an element to be positioned in order for filter/opacity to work. If your element doesn’t have a position you can work around this by adding ‘zoom: 1‘ to your CSS. There are other hacks to deal with this, zoom was the one I picked and it seems to work well enough.

In JavaScript you can find out if an element in IE has a position component by checking element.currentStyle.hasLayout. If hasLayout is false then the element has no CSS positioning.

If you want to learn more about this issue here is a reading list to get your started:

◦ Exploring OpacityStep-by-Step [broken link]

◦ On having layout

◦ Opacity @ QuirksMode

使用您的代码，这是一种可能的方法来确保如何测试这是否是您的问题:

function changeCss (property, value, target) {
    if (property === "opacity") {
        $(target).globalcss("filter","alpha(opacity="+value*100+")");   
        /* For IE 8 (and 9, 10, 11?). Don't miss the added quotes */
        $(target).globalcss("-MS-filter","\"progid:DXImageTransform.Microsoft.Alpha(Opacity="+value*100+")\""); 

        $(target).globalcss("zoom","1");   // ensure the target has layout
    }
    $(target).globalcss(property,value);
}

更复杂的版本会检查缩放是否已经存在，只有在缺失时才添加它。您还可以检查 hasLayout property 并且只有在它为 false 时才设置缩放，只要你防御 hasLayout 根本不存在的非 IE 情况。

如果这不能解决问题，您能否发布 HTML 示例或 URL，以便我们重现问题，从而更容易提出修复建议？谢谢!