Source code Analysis of jquery1.7.2 (vi) Basic functions

JQuery.fn.extend ({attr:function (name, value) {return jquery.access (this, jquery.attr, name, value, Arguments.length &G T 1);},removeattr:function (name) {return This.each (function () {jquery.removeattr (this, name);});},prop:function (name , value) {return jquery.access (this, jquery.prop, name, value, Arguments.length > 1);},removeprop:function (name) {name = jquery.propfix[Name] | | Name;return this.each (function () {//Try/catch handles cases where IE balks (such as REM  Oving a property on window) try {this[name] = undefined;delete this[name];} catch (E) {}});},addclass:function (value ) {var classnames, I, L, Elem,setclass, C, Cl;console.log (this) if (jquery.isfunction (value)) {return This.each (functi On (j) {JQuery (this). AddClass (Value.call (This, j, This.classname);});  if (value && typeof value = = = "string") {Classnames = Value.split (Rspace); for (i = 0, L = this.length; I < L i++) {elem = this[i];if (elem.nodetype = = 1) {if (!elem.ClassName && Classnames.length = = 1) {elem.classname = value;} else {setclass = "+ Elem.classname +" "; for ( c = 0, cl = classnames.length; C < cl; C + +) {if (!~setclass.indexof ("" + classnames[C] + ")) {SetClass + = classnames[c] +" ";}} Elem.classname = Jquery.trim (SetClass);}}}  return This;},removeclass:function (value) {var classnames, I, L, Elem, ClassName, C, Cl;if (Jquery.isfunction (value) {return This.each (function (j) {JQuery (this). Removeclass (Value.call (This, j, This.classname);});} if (value && typeof value = = = "string") | | value = = undefined) {classnames = (value | | ""). Split (Rspace); for (i = 0, L = this.length; I < L; i++) {elem = this[i];if (elem.nodetype = = 1 && elem.classname) {if (value) {ClassName = ("" + ELEM.CLASSN Ame + ""). Replace (Rclass, ""); for (c = 0, cl = classnames.length; C < cl; C + +) {ClassName = Classname.replace ("" + classnames[C] + "", "");} Elem.classname = JQuery.Trim (className);} else {elem.classname = "";}}}} return This;},toggleclass:function (value, stateval) {var type = typeof Value,isbool = typeof Stateval = = = "Boolean"; if (Jquery.isfunction (value)) {return This.each (function (i) {jQuery (this). Toggleclass (Value.call (This, I, This.classname, stateval), stateval);}) ;} Return This.each (function () {if (type = = = "string") {//Toggle individual class Namesvar classname,i = 0,self = JQuery ( This), state = Stateval,classnames = Value.split (Rspace) and while ((ClassName = classnames[i++]) {//check each CLASSN Ame given, space seperated liststate = Isbool? State:!self.hasclass (className), self[state? "AddClass": "Removeclass"] (className);} else if (type = = = "Undefined" | | type = = = "Boolean") {if (this.classname) {//Store className if Setjquery._data (this , "__classname__", This.classname);} Toggle whole Classnamethis.classname = This.classname | | Value = = = False? "": Jquery._data (This, "__classname__") | | "";}});},hasclass:function (selector) {var className = "" + selector + "", I = 0,l = This.length;for (; I < L; i++) {if (This[i].nodetype = = = 1 && ("" + This[i].classname + "). Replace (Rclass," "). IndexOf (ClassName) &G T -1) {return true;}} return False;},val:function (value) {var hooks, ret, Isfunction,elem = this[0];if (!arguments.length) {if (elem) {Ho OKs = jquery.valhooks[Elem.type] | | jquery.valhooks[elem.nodeName.toLowerCase ()];if (hooks && "get" in hooks && (ret = Hooks.get (Elem, "va Lue "))!== undefined) {return ret;} ret = Elem.value;return typeof ret = = = = "string"?//Handle most common string Casesret.replace (Rreturn, "")://Handle CAs Es where value is null/undef or Numberret = = null? ": ret;} return;} Isfunction = jquery.isfunction (value); return This.each (function (i) {var = jQuery (This), val;if (this.nodetype! = = 1) {return;} if (isfunction) {val = Value.call (This, I, self.val ());} else {val = value;} Treat NULL/undefined as ""; Convert numbers to stringif (val = = null) {val = "";} else if (typeof val = = = "Number") {val + = "";} else if (Jquery.isarray (val)) {val = Jquery.map (val, function (value) {return value = = null?) "": Value + "";}); Hooks = jquery.valhooks[This.type] | | jquery.valhooks[this.nodeName.toLowerCase ()];//If set returns undefined, fall back to normal settingif (!hooks | |! (" Set "in hooks) | | Hooks.set (This, Val, "value") = = = = undefined) {this.value = val;}});}); Jquery.extend {valhooks: {option: {get:function (Elem) {//Attributes.value is undefined in Blackberry 4.7 but//uses. V Alue. See #6932var val = Elem.attributes.value;return!val | | Val.specified? Elem.value:elem.text;}},select: {get:function (elem) {var value, I, max, option,index = Elem.selectedindex,values = [] , options = Elem.options,one = Elem.type = = = "Select-one";//Nothing is Selectedif (Index < 0) {return null;} Loop through all the selected Optionsi = one? Index:0;max = OnE? Index + 1:options.length;for (; i < Max; i++) {option = options[i];//Don ' t return options that is disabled or I n A disabled optgroupif (option.selected && jQuery.support.optDisabled!option.disabled:option.getattribute ("disabled") = = = null) && (!option.parentnode.disabled | |!jquery.nodename (option.parentnode, "Optgroup"))) {/ /Get The specific value for the optionvalue = jQuery (option). val ();//We don ' t need a array for one selectsif (one) {return value;} Multi-selects return an Arrayvalues.push (value);}} Fixes Bug #2551--select.val () broken in IE after Form.reset () if (one &&!values.length && options.le Ngth) {return jQuery (options[index]). Val (); Return Values;},set:function (Elem, value) {var values = Jquery.makearray (value); JQuery (Elem). Find ("option"). Ction () {this.selected = Jquery.inarray (JQuery (This). val (), values) >= 0;}); if (!values.length) {elem.selectedindex =-1;} Return Values;}}},atTRFN: {val:true,css:true,html:true,text:true,data:true,width:true,height:true,offset:true},attr:function (Elem, n Ame, value, pass) {var ret, hooks, notxml,ntype = elem.nodetype;//don ' t get/set attributes on text, comment and attribut E nodesif (!elem | | nType = = 3 | | nType = = 8 | | nType = = 2) {return;} if (pass && name in JQUERY.ATTRFN) {//equals $ (' div '). HTML (value) return JQuery (elem) [name] (value);} Fallback to prop when attributes is not supported//use Getettribute when $.PROPIF is not supported (typeof Elem.getattribute = = = "Undefi Ned ") {return Jquery.prop (elem, name, value);} When not an XML object notxml = NType!== 1 | | !jquery.isxmldoc (elem);//all attributes be lowercase//Grab necessary hook if one is Definedif (notxml) {name = Name . toLowerCase ();//Assuming that the value passed in is $.attr ("input", "value", 111, 0)//hooks=$.attrhooks[' value ']hooks = jquery.attrhooks[Name] | | (Rboolean.test (name)? boolhook:nodehook);} if (value!== undefined) {if (value = = = null) {jquery.removeattr (elEM, name); return;} else if (hooks && "set" in hooks && notxml && (ret = Hooks.set (elem, value, name))!== undefine d) {return ret;} else {Elem.setattribute (name, "" + value); return value;}} else if (hooks && "get" in hooks && notxml && (ret = Hooks.get (elem, name))!== null) {return RET;}  else {ret = Elem.getattribute (name);//non-existent attributes return null, we normalize to undefinedreturn ret = = = NULL ? undefined:ret;}},removeattr:function (Elem, value) {var propname, attrnames, name, L, isbool,i = 0;if (Value &AMP;&A mp Elem.nodetype = = = 1) {attrnames = Value.tolowercase (). Split (rspace); l = attrnames.length;for (; i < L; i++) {Name = attrnames[I];if (name) {propname = jquery.propfix[name] | | name;isbool = rboolean.test (name);//See #9699 for EX Planation of this approach (setting first, then removal)//Do not do the this for the Boolean attributes (see #10870) if (!isbool {jquery.attr (Elem, Name, "");} Elem. removeattribute (Getsetattribute name:propname);//Set corresponding property to False for Boolean attributesif (is Bool && propname in elem) {elem[propname] = false;}}}}},attrhooks: {type: {set:function (Elem, value) {//We Can ' t allow the type changed (since it causes problems in IE) if (Rtype.test (elem.nodename) && El Em.parentnode) {jquery.error ("Type property can ' t is changed");} else if (!jquery.support.radiovalue && value = = = "Radio" && Jquery.nodename (elem, "input") {//Setting the type on a radio button after the value resets the Value in ie6-9//Reset value to it's default in case type was set after value//this is for element creationvar val = elem. Value;elem.setattribute ("type", value); if (val) {elem.value = val;} Return value;}}},//Use the Value property for back compat//use the Nodehook for button elements in Ie6/7 (#1954) value: { Get:function (Elem, name) {if (Nodehook && jquery.nodename (elem, "button") {return Nodehook.get (elem, name);} Return name in Elem? elem.value:null;},set:function (Elem, value, name) {if (Nodehook && jquery.nodename (elem , "button") {return Nodehook.set (Elem, value, name);} Does not return so this setAttribute is also usedelem.value = Value;}}},propfix: {tabindex: "TabIndex", ReadOnly: "Reado Nly "," for ":" Htmlfor "," Class ":" ClassName ", MaxLength:" MaxLength ", cellspacing:" cellspacing ", cellpadding:" CellPadding ", rowspan:" RowSpan ", colspan:" colspan ", Usemap:" Usemap ", frameborder:" frameborder ", contenteditable:" Contenteditable "},prop:function (elem, name, value) {var ret, hooks, notxml,ntype = elem.nodetype;//don ' t get/set prope Rties on text, comment and attribute nodesif (!elem | | nType = = 3 | | nType = = 8 | | nType = = 2) {return;} Notxml = NType!== 1 | | !jquery.isxmldoc (Elem); if (notxml) {//Fix name and attach hooksname = jquery.propfix[Name] | | name;hooks = JQUERY.P rophooks[name];} if (value!== undefined) {if ( Hooks && "Set" in hooks && (ret = Hooks.set (elem, value, name))!== undefined) {return ret;} else {ret Urn (elem[name] = value);}} else {if (hooks && "get" in hooks && (ret = Hooks.get (elem, name)!== null) {return ret;} else {retur N elem[name];}}},prophooks: {tabIndex: {get:function (Elem) {//Elem.tabindex doesn ' t always return the correct value When it hasn ' t been explicitly set//http://fluidproject.org/blog/2008/01/09/ Getting-setting-and-removing-tabindex-values-with-javascript/var Attributenode = Elem.getAttributeNode ("TabIndex" ); return Attributenode && attributenode.specified parseint (attributenode.value): Rfocusable.test ( Elem.nodename) | | Rclickable.test (elem.nodename) && elem.href 0:undefined;}}}); /ADD the TabIndex Prophook to Attrhooks for Back-compat (different case is intentional) JQuery.attrHooks.tabindex = JQuery . prophooks.tabindex;//Hook for Boolean attributesboolhook = {get:function (Elem,Name) {//Align Boolean attributes with corresponding properties//Fall back to attribute presence where some booleans ar E not Supportedvar attrnode,property = Jquery.prop (elem, name); return property = = = True | | typeof Property!== "Boolean" && (Attrnode = Elem.getattributenode (name)) && Attrnode.nodevalue!== Fals E. Name.tolowercase (): Undefined;},set:function (Elem, value, name) {var propname;if (value = = = False) {//Remove bool EAN attributes when set to Falsejquery.removeattr (Elem, name);} else {//value is true since we know at the it's type Boolean and not false//Set Boolean attributes to the same NA Me and set the DOM propertypropname = jquery.propfix[Name] | | Name;if (propname in Elem) {//Only set the IDL specifically if it already exists on the elementelem[propname] = true; }elem.setattribute (name, Name.tolowercase ());} return name;};

jquery1.7.2 's source code Analysis (vi) basic functions