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    # 中時蓋板廣告說明 [示意頁面](https://project.chinatimes.com/shunbin/chinatimes2018/article-m.htm) [模擬載入的蓋版廣告頁](https://project.chinatimes.com/shunbin/chinatimes2018/ad-lightbox-320x480-auto-scale.htm) 下列廣告的容器代碼,會固定在內頁露出(檢視原始碼可見) ```=html <!--DFP RWD蓋版式廣告320x480開始--> <div class="ad rwd"> <!-- --> <div class="lightbox-auto-scale"> ... </div> </div> <!--DFP RWD蓋版式廣告320x480結束--> ``` css設定.lightbox-auto-scale這層,clip: rect(0, 0, 0, 0); overflow: hidden,是為了隱藏容器。 這樣做的目的,是因為我們發現,多層廣告商素材iframe嵌套時,常常會有內層素材(廣告商2)沒顯示,但外層框架(廣告商1)不知情的狀況 ```=html <!--DFP RWD蓋版式廣告320x480開始--> <div class="ad rwd"> <div class="lightbox-auto-scale"> <div id="div-gpt-ad-1551201747632-0" style="" data-google-query-id="CPzfspKX2fYCFY8nvQodKLYPrQ"> <div id="google_ads_iframe_/81206261/20_Chinatimes_Mobile/CP/20C_Mobile_InCover_0__container__" style="border: 0pt none; display: inline-block; width: 320px; height: 480px;"> <iframe id="vendor1"> 廣告商1,其為轉介的角色,不直接產出廣告素材,而是串接顯示下游廣告商的素材 ....其他機制代碼... <iframe id="vendor2">廣告商2產出的素材,但因為某些錯誤,只有空白</iframe> ....其他機制代碼... </iframe> </div> </div> </div> </div> <!--DFP RWD蓋版式廣告320x480結束--> ``` 此例中,iframe#vendor2的內容為空白,但沒有錯誤通知機制告訴iframe#vendor1, 導致廣告商1以為素材正確產出,故將大小資訊更新到 ``` #google_ads_iframe_/81206261/20_Chinatimes_Mobile/CP/20C_Mobile_InCover_0__container__ ``` 如:style="border: 0pt none; display: inline-block; width: 320px; height: 480px;" 這樣會在頁面產出一個寬320px,高480px的空白遮罩 使用者沒有方法關掉,因為我們的最外層框架沒有做關閉鈕,關閉鈕都是素材那個層級做的 遮罩也導致了下方內容無法點選互動 --- 我們的解決方式是,容器框架預設隱藏,讓素材通知母頁顯示,素材端的處理方式大致有兩種: > 1. 靜態的蓋版素材,套用我們自己開發的[gam框架](https://project.chinatimes.com/shunbin/chinatimes2018/ad-lightbox-320x480-auto-scale.htm) 當廣告iframe內容載入後,會透過window.top.postMessage,回傳大小型態等相關資訊 讓母頁上的監控js,將.lightbox-auto-scale這層,加上一個show的class,讓其顯示 此時框架代碼異動如下: ``` <!--DFP RWD蓋版式廣告320x480開始--> <div class="ad rwd"> <div class="lightbox-auto-scale show" data-state="init-complete" data-size="320x480" data-media-type="image"> ... </div> </div> <!--DFP RWD蓋版式廣告320x480結束--> ``` 而show這個class在css裡已有定義: ``` <style> .ad [class^="lightbox-"][class*="-auto-scale"].show { clip: auto; overflow: visible; } </style> ``` > 2. 若合作廠商有自己的蓋版廣告機制,可以用下列方式在頁面上顯示 - 直接將廣告素材 inject 到 window top (a) - 廣告素材置於原始容器內 => 在.lightbox-auto-scale這層,加上 .show,或是 => 將css注入到母頁,複寫clip設定 a.將廣告素材及css,js等,透過inject js的方式,注入到顯示廣告的母頁 ``` <!--DFP RWD蓋版式廣告320x480開始--> <div class="ad rwd"> <div class="lightbox-auto-scale"> ... <iframe id="vendor1">只做為跳板,實際的素材內容將另行注入於母頁</iframe> </div> </div> <!--DFP RWD蓋版式廣告320x480結束--> <!--廣告商1注入的代碼開始--> <div> 廣告商1的蓋版廣告 </div> <!--廣告商1注入的代碼結束--> ``` b.若廣告素材維持放在現有的容器,可透過js將母頁上的.lightbox-auto-scale這層,加一個show的class ``` <div class="lightbox-auto-scale show">...</div> ``` c.若廣告素材維持放在現有的容器,可透過js將css注入到母頁,複寫clip設定 ``` <style> .ad [class^="lightbox-"][class*="-auto-scale"] { clip: auto; overflow: visible; } </style> ```

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