How jQuery defines the dynamic Switching Effect of background

How jQuery defines the dynamic Switching Effect of background

This article mainly introduces how jQuery defines the dynamic Switching Effect of the background. The example analyzes jQuery's image operation skills and has some reference value. For more information, see

 

 

This article describes how jQuery defines the dynamic Switching Effect of background. Share it with you for your reference. The details are as follows:

Using the jQuery plug-in below, you can put the image in an array and tell jQuery where the background rotation is needed.

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(Function ($ ){ Var defaultSettings; Var divfg, divbg; Var fadeInterval; Var fqTimer; Var currImg = 0; Var displImg = 0; Var running = false; // Setup settings and initialize the plugin $. Fn. bgFade = function (settings, callback ){ DefaultSettings = $. extend ({ Frequency: 5000, Speed: 10, Images: [], Position: "center ", Fgz: 1, Bgz: 0 }, Settings ); Var c = 0; $ (This). each (function (){ If (c = 0) divfg = $ (this ); If (c = 1) divbg = $ (this ); C ++; }); SetBackgrounds (); If (typeof callback = "function "){ Callback (); } Return this; }; // Start the fadder $. Fn. start = function (){ FqTimer = setTimeout (function (){ NextFade ()}, defaultSettings. frequency ); Running = true; Return this; }; // Stop the fadder $. Fn. stop = function (){ ClearInterval (fadeInterval ); ClearTimeout (fqTimer ); Running = false; Return this; } // Get the current image info {array id, image url} $. Current = function (){ Return {pos: displImg, url: defaultSettings. images [displImg]} } // Set the first two backgrounds Function setBackgrounds (){ Image1 = defaultSettings. images [0]; Image2 = defaultSettings. images [1]; Divfg.css ({ BackgroundImage: "url ('" + image1 + "')", ZIndex: defaultSettings. fgz, BackgroundPosition: defaultSettings. postion }); Divbg.css ({ BackgroundImage: "url ('" + image2 + "')", ZIndex: defaultSettings. bgz, BackgroundPosition: defaultSettings. postion }); CurrImg = 1; DisplImg = 0; } // Set the next background after a fade completes Function setNextBackground (){ Next = arrayNext (); Image = defaultSettings. images [next]; Divbg.css ({ BackgroundImage: "url ('" + image + "')" }); SetTimeout (function () {nextFade ()}, defaultSettings. frequency ); } // Run a fade Function nextFade (){ FadeInterval = setInterval (function () {fadeIt ()}, 30 ); } // Decrement the opacity of the div Function fadeIt (){ If(divfg.css ("opacity") = ''){ Op = 1; } Else { Op = divfg.css ("opacity "); } Op-= (1000 * defaultSettings. speed)/30) * 0.0001; Divfg.css ("opacity", op ); If (op <= 0 ){ Bg = divbg; Bgimg = divbg.css ("background-image "); Divfg.css ("opacity", "1 "); Divfg.css ("background-image", bgimg ); ClearInterval (fadeInterval ); SetNextBackground (); DisplImg = arrayCurrent (); } } // Get the next item in the array Function arrayNext (){ Var next = currImg + 1; If (next> = defaultSettings. images. length ){ Next = 0; } CurrImg = next; Return next; } // Get the current item in the array Function arrayCurrent (){ Var cur = currImg-1; If (cur <0) Cur = defaultSettings. images. length-1; Return cur; } }) (JQuery );

I hope this article will help you with jQuery programming.