Table from 2D array in AngularJS -


i'm stuck on expecting angularjs work out of box without issues, , yet strangely enough...

i'm using json service returns data 2d array:

$scope.data= [     ["val-11", "val-12", "val-13"],     ["val-21", "val-22", "val-23"]     ];

from i'm trying generate table this:

<table> <tr ng-repeat="row in data"> <td ng-repeat="col in row">{{col}}</td> </tr> </table>

i don't understand why angularjs doesn't handle such basic scenario. can correct $index parent loop, if need it, can iterate through values, 1 loop "col in data[0]", cannot result trying use nested loop shown above.

am doing wrong? seems basic not work right away. please me bizarre issue.

in angular 1.0.x ng-repeat directive had numerous bugs caused trying "guess" whether non-object values (i.e. strings or numbers) had been added, removed or moved. problem non-objects have no identity of own, impossible track them accurately. problematic in number of cases , caused ngrepeat code bloated loads of workarounds , edge cases.

in 1.2 improved syntax ng-repeat allow developer specify how identify items in collection. done "track by" keyword. 1 consequence of disallow items have same identifier.

by default ng-repeat try track value of item. if have repeated items such same object or identical strings or numbers ng-repeat complain , see error in console.

var tablectrl = function($scope) {   $scope.data= [     ["", "", "val-13"]   ]; }

here first 2 items in sub-array same "empty" string. see fiddle: http://jsfiddle.net/teu8r/

if want have repeated items in collection need provide method ng-repeat distinguish them. simplest , obvious approach track items position in collection. done using "track $index". here same example fixed in way:

<table ng-controller="tablectrl">   <tr ng-repeat="row in data">     <td ng-repeat="col in row track $index">        {{$parent.$index}}-{{$index}} {{col}}     </td>   </tr> </table>

http://jsfiddle.net/h44z8/

so not bug in angularjs. correct people should aware of change when upgrading 1.2


Comments

Post a Comment

Popular posts from this blog

c++ - CryptStringToBinary API behavior -

i seeing strange behavior cryptstringtobinary cryptography api. please see below code (config: x64 debug): #include "stdafx.h" #include <windows.h> #include <strsafe.h> #include <iostream> #include <exception> void main() { dword dwskip; dword dwflags; dword dwdatalen; //lpcwstr pszinput = l"jaaaaaecaaadzgaaakqaagdnnl1l56bwgfjdgr3rpxtqqqn6daw3usv2emkjym4t"; //this works fine lpcwstr pszinput = l"mytest"; //doesnt work, api returns false,error code 0x0000000d // determine size of byte array , allocate memory. if(! cryptstringtobinary( pszinput, _tcslen( pszinput ) + 1, crypt_string_base64, null, &dwdatalen, &dwskip, &dwflags ) ) { dword dw = getlasterror(); //0x0000000d: data invalid throw std::exception( "error computing byte length." ); } byte *pbytebyte = null; try { ...
Read more

java.util.scanner - How to read and add only numbers to array from a text file -

i'm learning java , have question regarding reading file want read numbers file contains strings well. here example of file: 66.56 "3 java 3-43 5-42 2.1 1 and here coding: public class test { public static void main (string [] args){ if (0 < args.length) { file x = new file(args[0]); try{ scanner in = new scanner( new fileinputstream(x)); arraylist<double> test = new arraylist<>(); while(in.hasnext()){ if(in.hasnextdouble()){ double f=in.nextdouble(); test.add(f);} else {in.next();} } catch(ioexception e) { system.err.println("exception during reading: " + e); } } my problem add 66.56,2.1 , 1 doesn't add 3 after "3 or ignores 3-43 , 5-42 can tell me how skip strings , add doubles here? thanks all said 3 ie; "3, 3-43 , 4-42 strings either u read string , split , check number @ " , - or put in space between characters , integers. jvm after compilation tre...
Read more

iphone - Three second countdown in cocos2d -

i trying have 3 second countdown display when level beat in game. did: -(void) gamesegmentbeat { [self pauseschedulerandactions]; // overlay game opaque background ccsprite *opaquebg = [ccsprite spritewithfile:@"background1.png"]; opaquebg.position = screencenter; [self addchild:opaquebg z:10000]; // these 3 labels 3 seconds cclabelttf *three = [cclabelttf labelwithstring:@"3" fontname:@"helvetica" fontsize:100]; three.position = ccp(screencenter.x, screencenter.y); cclabelttf *two = [cclabelttf labelwithstring:@"2" fontname:@"helvetica" fontsize:100]; two.position = ccp(screencenter.x, screencenter.y); cclabelttf *one = [cclabelttf labelwithstring:@"1" fontname:@"helvetica" fontsize:100]; one.position = ccp(screencenter.x, screencenter.y); // secondspast specified in update method secondspast = 0; if (secondspast == 1) { [self addchild:thr...
Read more