在頁面點擊"注冊",出現一層有不透明度的黑色遮罩;遮罩層的上方是注冊框;此時無法點擊頁面上除注冊框外的其他元素;點擊注冊框上的"隨便逛逛",遮罩層消失。
預覽地址:
http://jsfiddle.net/p2x3c7df/embedded/result/
要點:
1.注冊框始終水平、垂直居中,包括鼠標滾輪上下滾動頁面、縮放頁面和調整瀏覽器窗口大小時
主要由CSS控制,注冊框的寬度和高度都已經確定( 620*420px ),首先使用position:fixed來使它相對于瀏覽器窗口絕對定位;然后使它垂直居中:top:50%; left:50%; margin:-210px 0 0 -310px;
2.當縮放頁面和調整瀏覽器窗口大小時,遮罩層需始終覆蓋整個文檔和充滿整個瀏覽器可視窗口以及需要滾動才能瀏覽到的部分,需要兼容Chrome和IE等不同內核瀏覽器;
兩個重要的屬性:js的window.screen.availHeight和jQuery的$(document.body).outerHeight(true)。window.screen.availHeight指屏幕可用工作區域的高,$(document.body).outerHeight(true)指瀏覽器當前窗口文檔body的總寬度 包括border padding margin。window.screen.availHeight主要用于IE(11)縮放頁面后,遮罩層仍能充滿瀏覽器窗口。
3.遮罩層出現時,頁面仍可以上下滾動,但是無法操作頁面中除登陸框外的其他元素
代碼:
HTML( 需測試足夠高的文檔 ):
"She is going to leave her house," said the steward.
"And her son?"
"Florentin, his valet, thinks he is going to do the same."
"Come this way." Monte Cristo took Bertuccio into his study, wrote the letter we have seen, and gave it to the steward. "Go," said he quickly. "But first, let Haidee be informed that I have returned."
"Here I am," said the young girl, who at the sound of the carriage had run down-stairs and whose face was radiant with joy at seeing the count return safely. Bertuccio left. Every transport of a daughter finding a father, all the delight of a mistress seeing an adored lover, were felt by Haidee during the first moments of this meeting, which she had so eagerly expected. Doubtless, although less evident, Monte Cristo's joy was not less intense. Joy to hearts which have suffered long is like the dew on the ground after a long drought; both the heart and the ground absorb that beneficent moisture falling on them, and nothing is outwardly apparent.
Monte Cristo was beginning to think, what he had not for a long time dared to believe, that there were two Mercedes in the world, and he might yet be happy. His eye, elate with happiness, was reading eagerly the tearful gaze of Haidee, when suddenly the door opened. The count knit his brow. "M. de Morcerf!" said Baptistin, as if that name sufficed for his excuse. In fact, the count's face brightened.
"Which," asked he, "the viscount or the count?"
"The count."
"Oh," exclaimed Haidee, "is it not yet over?"
"I know not if it is finished, my beloved child," said Monte Cristo, taking the young girl's hands; "but I do know you have nothing more to fear."
"But it is the wretched" --
"That man cannot injure me, Haidee," said Monte Cristo; "it was his son alone that there was cause to fear."
"And what I have suffered," said the young girl, "you shall never know, my lord." Monte Cristo smiled. "By my father's tomb," said he, extending his hand over the head of the young girl, "I swear to you, Haidee, that if any misfortune happens, it will not be to me."
The door was wide open, a hackney-coach was standing in the middle of the yard -- a strange sight before so noble a mansion; the count looked at it with terror, but without daring to inquire its meaning, he rushed towards his apartment. Two persons were coming down the stairs; he had only time to creep into an alcove to avoid them. It was Mercedes leaning on her son's arm and leaving the house. They passed close by the unhappy being, who, concealed behind the damask curtain, almost felt Mercedes dress brush past him, and his son's warm breath, pronouncing these words, -- "Courage, mother! Come, this is no longer our home!" The words died away, the steps were lost in the distance. The general drew himself up, clinging to the curtain; he uttered the most dreadful sob which ever escaped from the bosom of a father abandoned at the same time by his wife and son. He soon heard the clatter of the iron step of the hackney-coach, then the coachman's voice, and then the rolling of the heavy vehicle shook the windows. He darted to his bedroom to see once more all he had loved in the world; but the hackney-coach drove on and the head of neither Mercedes nor her son appeared at the window to take a last look at the house or the deserted father and husband. And at the very moment when the wheels of that coach crossed the gateway a report was heard, and a thick smoke escaped through one of the panes of the window, which was broken by the explosion.
The door was wide open, a hackney-coach was standing in the middle of the yard -- a strange sight before so noble a mansion; the count looked at it with terror, but without daring to inquire its meaning, he rushed towards his apartment. Two persons were coming down the stairs; he had only time to creep into an alcove to avoid them. It was Mercedes leaning on her son's arm and leaving the house. They passed close by the unhappy being, who, concealed behind the damask curtain, almost felt Mercedes dress brush past him, and his son's warm breath, pronouncing these words, -- "Courage, mother! Come, this is no longer our home!" The words died away, the steps were lost in the distance. The general drew himself up, clinging to the curtain; he uttered the most dreadful sob which ever escaped from the bosom of a father abandoned at the same time by his wife and son. He soon heard the clatter of the iron step of the hackney-coach, then the coachman's voice, and then the rolling of the heavy vehicle shook the windows. He darted to his bedroom to see once more all he had loved in the world; but the hackney-coach drove on and the head of neither Mercedes nor her son appeared at the window to take a last look at the house or the deserted father and husband. And at the very moment when the wheels of that coach crossed the gateway a report was heard, and a thick smoke escaped through one of the panes of the window, which was broken by the explosion.
</div>
</div>
HTML
CSS:
width:620px;
height:420px;
position:fixed;
top:50%;
left:50%;
margin:-210px 0 0 -310px;
border-radius:8px; /*圓角*/
background-color:#999;
z-index:3;
display:none;
}
.go{
position:absolute;
right: 10px;
top: 10px;
padding: 5px 12px;
background: rgba(0,0,0,.4);
box-shadow: 0 0 0 2px rgba(255,255,255,.4);
color: #fff;
border-radius: 26px;
}
#mask{
background-color:#000;
position:absolute;
top:0;
left:0;
display:none;
z-index:2;
}
#register{ z-index:1; color:blue;}
.content{ width:800px; height:auto; margin:0 auto;}
JS:
//根據瀏覽器可視窗口的變化調整遮罩的寬度和高度,使遮罩充滿瀏覽器
$(window).resize(function(){
//根據瀏覽器窗口變化改變遮罩寬度和高度,使遮罩充滿整個瀏覽器
if($("#mask").css("width")!=0){
$("#mask").css("width","100%"); //必要時可對寬度也作出判斷
if(window.screen.availHeight > $(document.body).outerHeight(true)){
$("#mask").css({"opacity":"0.5","width":"100%","height":window.screen.availHeight});
}else{
$("#mask").css({"opacity":"0.5","width":"100%","height":$(document.body).outerHeight(true)});
}
}
});
$(".go").click(function(){
$("#mask").hide();
$("#rbox").hide();
});
});
至此功能完成。
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