<i id="rqquy"></i>

  1. <label id="rqquy"><xmp id="rqquy">

  2. < div class=\"fixable\">fixable<\/div>
    <\/body>
    <\/html>
    \n<\/div>\n
    Compared with the previous method, this is more perfect , but there are also some problems. For example, the background of the body can only be fixed, and using expression consumes relatively large resources.
    The bigger problem is that it cannot be positioned using percentage values ??or right\/bottom.
    In order to solve this problem, the program uses a positioning layer. This layer uses the above method to achieve fixed positioning. The size is the same as the window size and the position coincides. Then as long as the general positioning method is used to position relative to this layer, it can be achieved. The effect of relative window positioning.

    The compatible program is mainly in the RepairFixed object. First set the body background:
    \nCopy the code <\/u><\/a><\/span> The code is as follows: <\/div>\n

    if (body.currentStyle.backgroundAttachment !== \"fixed\") {
    if (body.currentStyle.backgroundImage === \"none\") {
    body.runtimeStyle.backgroundRepeat = \" no-repeat\";
    body.runtimeStyle.backgroundImage = \"url(about:blank)\";
    }
    body.runtimeStyle.backgroundAttachment = \"fixed\";
    }
    \n<\/div>
    Create the positioning layer again:
    \nCopy the code <\/u><\/a><\/span> The code is as follows: <\/div>\n

    layer = document. createElement(\"
    \");
    \n<\/div>
    The positioning layer also needs to be set to \"overflow:hidden\". The advantage is that the document will not be automatically expanded because the pop-up layer is outside the original scope of the document.
    ie6 tests the following code, the document will continue to expand as it scrolls down:
    \nCopy the code<\/u><\/a><\/span> The code is as follows:<\/div>\n







    < div class="fixable">fixable




    Compared with the previous method, this is more perfect , but there are also some problems. For example, the background of the body can only be fixed, and using expression consumes relatively large resources.
    The bigger problem is that it cannot be positioned using percentage values ??or right/bottom.
    In order to solve this problem, the program uses a positioning layer. This layer uses the above method to achieve fixed positioning. The size is the same as the window size and the position coincides. Then as long as the general positioning method is used to position relative to this layer, it can be achieved. The effect of relative window positioning.

    The compatible program is mainly in the RepairFixed object. First set the body background:
    Copy the code The code is as follows:

    if (body.currentStyle.backgroundAttachment !== "fixed") {
    if (body.currentStyle.backgroundImage === "none") {
    body.runtimeStyle.backgroundRepeat = " no-repeat";
    body.runtimeStyle.backgroundImage = "url(about:blank)";
    }
    body.runtimeStyle.backgroundAttachment = "fixed";
    }

    Create the positioning layer again:
    Copy the code The code is as follows:

    layer = document. createElement("
    ");

    The positioning layer also needs to be set to "overflow:hidden". The advantage is that the document will not be automatically expanded because the pop-up layer is outside the original scope of the document.
    ie6 tests the following code, the document will continue to expand as it scrolls down:
    Copy the code The code is as follows:







    fixable





    加上"overflow:hidden"就可以防止這種情況。

    然后彈出層通過append方法修改為"absolute"定位,并插入到這個(gè)定位層,這樣就能實(shí)現(xiàn)fixed效果了。

    由于這個(gè)定位層比較耗資源,所以在有元素插入時(shí)才會(huì)插到body中。
    在不需要fixed的時(shí)候,要用remove方法從定位層中移除,當(dāng)定位層內(nèi)沒有需要定位元素就會(huì)自動(dòng)從body移除。
    ps:隱藏的話expression還會(huì)繼續(xù)執(zhí)行,要移出文檔才行。


    【居中效果】

    加入居中擴(kuò)展程序,并且設(shè)置center為true,就會(huì)自動(dòng)相對(duì)窗口居中。
    居中的原理跟仿Lightbox效果是一樣的,通過設(shè)置負(fù)的元素尺寸一半的margin和"50%"的top/left來居中。
    要注意的是不是使用fixed定位時(shí),計(jì)算需要加上scrollTop/scrollLeft。


    【覆蓋層】

    在仿Lightbox效果中,ie6的覆蓋層是通過創(chuàng)建一個(gè)覆蓋整個(gè)頁面的層來做的。
    使用新的兼容fixed方法后,就不用另外做兼容,按照fixed的效果做就行了。
    覆蓋層是由AlertBox擴(kuò)展而來,它其實(shí)就是一個(gè)大小跟窗口一樣,并且跟窗口重合的彈出層。
    由于覆蓋層一般只需要定義一個(gè)就行了,這里把它做成一個(gè)OverLay對(duì)象,使用時(shí)直接調(diào)用它的show和close方法。


    【遮蓋select】

    在仿Lightbox效果中介紹過兩種遮蓋select的方法:隱藏和iframe。
    程序是通過iframe來遮蓋的,放在ie6的兼容擴(kuò)展程序中。
    在iframe定位時(shí)要注意,要定位到彈出層的負(fù)的clientTop/clientLeft,這樣才能保證邊框不會(huì)被遮住。


    使用技巧

    【定位】

    除了居中,程序會(huì)按照彈出層本身的定位樣式來顯示。
    不是fixed定位時(shí)要注意,在ie6是相對(duì)當(dāng)前窗口來定位的,其他都是相對(duì)第一屏窗口來定位的。
    還要注意,必須聲明DOCTYPE,才能正確定位。
    程序?yàn)榱吮M量通用,降低了效率(用了4個(gè)expression),所以最好還是根據(jù)實(shí)際情況自己來調(diào)整。
    ps:需要像定位提示效果那樣預(yù)設(shè)定位的話,可以自行擴(kuò)展。

    【鎖定鍵盤】

    使用覆蓋層時(shí),為了防止用戶通過鍵盤操作頁面,可以在document的keydown中執(zhí)行preventDefault來禁用。
    如果彈出層需要正常操作,只要在彈出層的keydown中執(zhí)行stopPropagation就行了。

    【拖動(dòng)彈窗】

    這里只是簡(jiǎn)單的加上拖動(dòng)功能,要注意的是fixed定位時(shí),計(jì)算拖動(dòng)的參考對(duì)象是不同的。
    更詳細(xì)的拖動(dòng)介紹可以看看這個(gè)拖動(dòng)效果。


    使用說明

    實(shí)例化時(shí),必須有彈出層作為參數(shù):

    new?AlertBox("idBox");


    Optional parameters are used to set the default attributes of the program, including:
    Attribute: Default value//Description
    fixed: false,//Whether the positioning is fixed
    zIndex: 1000,// Number of cascades
    onShow: $$.emptyFunction,//Executed when displayed
    onClose: $$.emptyFunction//Executed when closed

    The following methods are also provided:
    show: display the pop-up layer;
    close: hide the pop-up layer;
    dispose: destroy the program.

    After adding the extension compatible with ie6, the fixed problem of ie6 will be automatically corrected. You can set whether to fix the select mask bug according to the fixSelect attribute. The default is yes.
    After adding the centering extension, you can set whether to center according to the center attribute. The default is no.

    RepairFixed corrects fixed objects and can be used independently. It has append and remove methods to add and remove elements that need to be fixed. It can only be used in IE6.
    OverLay overlay object has the following attributes:
    Attribute: Default value//Description
    "color": "#fff",//Background color
    "opacity": .5,// Transparency (0-1)
    "zIndex": 100, // Overlay value
    There are also show and close methods to display and hide the overlay.

    Package download address

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