Front-end pageCodeTest use
<% @ Page Language = "C #" autoeventwireup = "true" codebehind = "getgradeclassinfo. aspx. cs" inherits = "Eyes. Web. getgradeclassinfo" %> <! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <HTML xmlns = "http://www.w3.org/1999/xhtml"> VaR Xhr; window. onload = Function () {Xhr = New XMLHttpRequest (); getdatabyajax (); showmsg ();} Function Showmsg () {document. getelementbyid ( "Msgdiv"). style. Display = "Block" ; Document. getelementbyid ( "Msgimg"). src = "images/load.gif" ;} Function Getdatabyajax () {xhr. Open ( "Get", "getgradeclassinfo. aspx? Isajax = 1 ", True ); Xhr. setRequestHeader ( "If-modified-since", "0 "); // No Cache Xhr. onreadystatechange = Watching; xhr. Send ( Null );} // Storage server returned grade/class information VaR Jsonresult; Function Watching (){ If (Xhr. readystate = 4){ If (Xhr. Status = 200 ){ VaR Resstr = Xhr. responsetext; jsonresult = Eval ("(" + resstr + ")" ); Addgradestoselectcontrol (jsonresult. Grades); addclassestoselectcontrol (jsonresult. Grades [ 0 ]. ID); document. getelementbyid ( "Msgdiv"). style. Display = "NONE" ;} Else {Alert ( "Server error" + Xhr. Status );}}} // Select an array containing the grade information ---> Generate the grade drop-down list option Function Addgradestoselectcontrol (gradearr ){ VaR Selgrades = Document. getelementbyid ("grades" ); For ( VaR I = 0; I <gradearr. length; I ++ ){ VaR Option = New Option (gradearr [I]. Name, gradearr [I]. ID); selgrades. Options. Add (option );}} // Select an array containing the class information ---> Generate the class drop-down list option Function Addclassestoselectcontrol (gradeid ){ VaR Selclasses = Document. getelementbyid ("classes" ); Clearsel (selclasses ); For ( VaR I = 0; I <jsonresult. classes. length; I ++){ If (Gradeid = Jsonresult. classes [I]. cgid ){ VaR Option = New Option (jsonresult. classes [I]. Name, jsonresult. classes [I]. ID); selclasses. Options. Add (option );}}} // Clear drop-down list box Function Clearsel (selobj ){ For ( VaR I = selobj. Options. Length-1; I>-1; I -- ) {Selobj. Options [I] = Null ;}} </SCRIPT> Background page -- manually splice JSON strings
Using System; Using System. Collections. Generic; Using System. LINQ; Using System. Web; Using System. Web. UI; Using System. Web. UI. webcontrols; Using System. text; Namespace Eyes. Web { Public Partial Class Getgradeclassinfo: system. Web. UI. Page {BLL. grademanager = New Bll. grademanager (); BLL. classmanager = New Bll. classmanager (); // Age Information List <model. Grades> listgrades = Null ; List <Model. Classes> listclasses = Null ; Protected Void Page_load ( Object Sender, eventargs e ){ If (! String . Isnullorwhitespace (request. querystring [ " Isajax " ]) {System. Threading. thread. Sleep ( 5000 ); Loaddata (); String Gradearrstr =Getgradedatastring (); String Classarrstr = Getclassdatastring (); response. Write ( " {Grades: " + Gradearrstr + " , Classes: " + Classarrstr + " } " ); Response. End ();}} /// <Summary> /// Obtain the grade data string /// </Summary> /// <Returns> [{ID: 1, name: "eyes" },{}] </Returns> Public String Getgradedatastring () {stringbuilder sbstr = New Stringbuilder ( " [ " ); Foreach (Model. Grades Model In Listgrades) {sbstr. append ( " {ID: " ); Sbstr. append (model. GID); sbstr. append ( " , Name :\" " ); Sbstr. append (model. gname); sbstr. append ( " \"}, " );} Return Sbstr. tostring (). substring ( 0 , Sbstr. Length- 1 ) + " ] " ;} /// <Summary> /// Obtain the class data string /// </Summary> /// <Returns> </returns> Public String Getclassdatastring () {stringbuilder sbstr = New Stringbuilder ( " [ " ); Foreach (Model. Classes Model In Listclasses) {sbstr. append ( " {ID: " ); Sbstr. append (model. CID); sbstr. append ( " , Name :\" " ); Sbstr. append (model. cname); sbstr. append ( " \ ", Cgid: " ); Sbstr. append (model. cgid); sbstr. append ( " }, " );} Return Sbstr. tostring (). Trim ( ' , ' ) + " ] " ;} Public Void Loaddata () {listgrades =Grademanager. getallgrades (); listclasses = Classmanager. getallclasses ();}}} Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
