3個可以改善用戶體驗的AngularJS指令介紹

 　　這篇文章主要介紹了3個可以改善用戶體驗的AngularJS指令,AngularJS是一款具有很高人氣的JavaScript框架,需要的朋友可以參考下

　　1.頭像圖片

　　為了在你的應用中展示頭像圖片，你需要使用用戶的電子郵件地址，將地址轉換為小寫並使用md5加密該字符串。所以聰明的做法是使用指令來做到這些，並且可以復用。

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29   /* * A simple Gravatar Directive * @example * <gravatar-image email="[email protected]" size="50"></gravatar-image> */ app.directive('gravatarImage', function () { return { restrict: 'AE', replace: true, required: 'email', template: '<img ng-src="https://www.gravatar.com/avatar/{{hash}}?s={{size}}&d=identicon" />', link: function (scope, element, attrs) { attrs.$observe('email', function (value) { if(!value) { return; }   // MD5 (Message-Digest Algorithm) by WebToolkit var md5=function(s){function L(k,d){return(k<<d)|(k>>>(32-d));}function K(G,k){var I,d,F,H,x;F=(G&2147483648);H =(k&2147483648);I=(G&1073741824);d=(k&1073741824);x=(G&1073741823)+(k&1073741823);if(I&d){return (x^2147483648^F^H);}if(I|d){if(x&1073741824){return(x^3221225472^F^H);}else{return(x^1073741824^F^H);}} else{return(x^F^H);}}function r(d,F,k){return(d&F)|((~d)&k);}function q(d,F,k){return(d&k)|(F&(~k));}function p(d,F,k) {return(d^F^k);}function n(d,F,k){return(F^(d|(~k)));}function u(G,F,aa,Z,k,H,I){G=K(G,K(K(r(F,aa,Z),k),I));return K(L( G,H),F);}function f(G,F,aa,Z,k,H,I){G=K(G,K(K(q(F,aa,Z),k),I));return K(L(G,H),F);}function D(G,F,aa,Z,k,H,I){G=K(G ,K(K(p(F,aa,Z),k),I));return K(L(G,H),F);}function t(G,F,aa,Z,k,H,I){G=K(G,K(K(n(F,aa,Z),k),I));return K(L(G,H),F);}fu nction e(G){var Z;var F=G.length;var x=F+8;var k=(x-(x%64))/64;var I=(k+1)*16;var aa=Array(I-1);var d=0;var H=0;w hile(H<F){Z=(H-(H%4))/4;d=(H%4)*8;aa[Z]=(aa[Z]|(G.charCodeAt(H)<<d));H++;}Z=(H-(H%4))/4;d=(H%4)*8;aa[Z] =aa[Z]|(128<<d);aa[I-2]=F<<3;aa[I-1]=F>>>29;return aa;}function B(x){var k="",F="",G,d;for(d=0;d<=3;d++){G=(x>> >(d*8))&255;F="0"+G.toString(16);k=k+F.substr(F.length-2,2);}return k;}function J(k){k=k.replace(/rn/g,"n");var d=" ";for(var F=0;F<k.length;F++){var x=k.charCodeAt(F);if(x<128){d+=String.fromCharCode(x);}else{if((x>127)&&(x<2 048)){d+=String.fromCharCode((x>>6)|192);d+=String.fromCharCode((x&63)|128);}else{d+=String.fromCharCo de((x>>12)|224);d+=String.fromCharCode(((x>>6)&63)|128);d+=String.fromCharCode((x&63)|128);}}}return d;}v ar C=Array();var P,h,E,v,g,Y,X,W,V;var S=7,Q=12,N=17,M=22;var A=5,z=9,y=14,w=20;var o=4,m=11,l=16,j=23;var U=6,T=10,R=15,O=21;s=J(s);C=e(s);Y=1732584193;X=4023233417;W=2562383102;V=271733878;for(P=0;P <C.length;P+=16){h=Y;E=X;v=W;g=V;Y=u(Y,X,W,V,C[P+0],S,3614090360);V=u(V,Y,X,W,C[P+1],Q,3905402710); W=u(W,V,Y,X,C[P+2] ,N,606105819);X=u(X,W,V,Y,C[P+3],M,3250441966);Y=u(Y,X,W,V,C[P+4],S,4118548399);V=u(V,Y,X,W,C[P+5], Q,1200080426);W=u(W,V,Y,X,C[P+6],N,2821735955);X=u(X,W,V,Y,C[P+7],M,4249261313);Y=u(Y,X,W,V,C[P+8],S ,1770035416);V=u(V,Y,X,W,C[P+9],Q,2336552879);W=u(W,V,Y,X,C[P+10],N,4294925233);X=u(X,W,V,Y,C[P+11 ],M,2304563134);Y=u(Y,X,W,V,C[P+12],S,1804603682);V=u(V,Y,X,W,C[P+13],Q,4254626195);W=u(W,V,Y,X,C[P+14], N,2792965006);X=u(X,W,V,Y,C[P+15],M,1236535329);Y=f(Y,X,W,V,C[P+1],A,4129170786);V=f(V,Y,X,W,C[P+6],z,322 5465664);W=f(W,V,Y,X,C[P+11],y,643717713);X=f(X,W,V,Y,C[P+0],w,3921069994);Y=f(Y,X,W,V,C[P+5],A,359340860 5);V=f(V,Y,X,W,C[P+10],z,38016083);W=f(W,V,Y,X,C[P+15],y,3634488961);X=f(X,W,V,Y,C[P+4],w,3889429448);Y=f(Y ,X,W,V,C[P+9],A,568446438);V=f(V,Y,X,W,C[P+14],z,3275163606);W=f(W,V,Y,X,C[P+3],y,4107603335);X=f(X,W,V,Y,C [P+8],w,1163531501);Y=f(Y,X,W,V,C[P+13],A,2850285829);V=f(V,Y,X,W,C[P+2],z,4243563512);W=f(W,V,Y,X,C[P+7], y,1735328473);X=f(X,W,V,Y,C[P+12],w,2368359562);Y=D(Y,X,W,V,C[P+5],o,4294588738);V=D(V,Y,X,W,C[P+8],m,22 72392833);W=D(W,V,Y,X,C[P+11],l,1839030562);X=D(X,W,V,Y,C[P+14],j,4259657740);Y=D(Y,X,W,V,C[P+1],o,27639 75236);V=D(V,Y,X,W,C[P+4],m,1272893353);W=D(W,V,Y,X,C[P+7],l,4139469664);X=D(X,W,V,Y,C[P+10],j,32002366 56);Y=D(Y,X,W,V,C[P+13],o,681279174);V=D(V,Y,X,W,C[P+0],m,3936430074);W=D(W,V,Y,X,C[P+3],l,3572445317);X= D(X,W,V,Y,C[P+6],j,76029189);Y=D(Y,X,W,V,C[P+9],o,3654602809);V=D(V,Y,X,W,C[P+12],m,3873151461);W=D(W,V ,Y,X,C[P+15],l,530742520);X=D(X,W,V,Y,C[P+2],j,3299628645);Y=t(Y,X,W,V,C[P+0],U,4096336452);V=t(V,Y,X,W,C[P +7],T,1126891415);W=t(W,V,Y,X,C[P+14],R,2878612391);X=t(X,W,V,Y,C[P+5],O,4237533241);Y=t(Y,X,W,V,C[P+12] ,U,1700485571);V=t(V,Y,X,W,C[P+3],T,2399980690);W=t(W,V,Y,X,C[P+10],R,4293915773);X=t(X,W,V,Y,C[P+1],O,224 0044497);Y=t(Y,X,W,V,C[P+8],U,1873313359);V=t(V,Y,X,W,C[P+15],T,4264355552);W=t(W,V,Y,X,C[P+6],R,2734768916) ;X=t(X,W,V,Y,C[P+13],O,1309151649);Y=t(Y,X,W,V,C[P+4],U,4149444226);V=t(V,Y,X,W,C[P+11],T,3174756917);W= t(W,V,Y,X,C[P+2],R,718787259);X=t(X,W,V,Y,C[P+9],O,3951481745);Y=K(Y,h);X=K(X,E);W=K(W,v);V=K(V,g);}var i=B(Y)+B(X)+B(W)+B(V);return i.toLowerCase();};   scope.hash = md5(value.toLowerCase()); scope.size = attrs.size;   if(angular.isUndefined(scope.size)) { scope.size = 60; // default to 60 pixels } }); } }; });

　　2. 關注我

　　這其實是一個非常簡短的指令，但是非常棒。在下面的例子中，用戶點擊了一個鏈接，顯示的輸入框需要能夠自動獲得焦點。這樣，用戶在頁面顯示時不必再手動點擊文本域。

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 /** * Sets focus to this element if the value of focus-me is true. * @example * <a ng-click="addName=true">add name</a> * <input ng-show="addName" type="text" ng-model="name" focus-me="{{addName}}" /> */ app.directive('focusMe', ['$timeout', function($timeout) { return { scope: { trigger: '@focusMe' }, link: function(scope, element) { scope.$watch('trigger', function(value) { if(value === "true") { $timeout(function() { elemen