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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                # ANGULAR.JS:?NG-SELECT?AND?NG-OPTIONS PS:其實看英文文檔比看中文文檔更容易理解,前提是你的英語基礎還可以。英文文檔對于知識點講述簡明扼要,通俗易懂,而有些中文文檔讀起來特別費力,基礎差、底子薄的有可能一會就會被繞暈了,最起碼英文文檔中的代碼與中文文檔中的代碼是一致的,但知識點講述實在是差距太大。 Angular.js?has?a?powerful?directive?waiting?for?you:?it's?ng-select.?With?it?you?can?fill?an?HTML-select?box?from?your?model.?It?supports?a?pretty?cool?selector?syntax,?which?is?-?unfortunately?-?a?little?bit?tricky. ~~~ Let's?assume?you?have?a?JSON?stream?which?looks?like?this: { ????"myOptions":?[ ????????{ ????????????"id":?106, ????????????"group":?"Group?1", ????????????"label":?"Item?1" ????????}, ????????{ ????????????"id":?107, ????????????"group":?"Group?1", ????????????"label":?"Item?2" ????????}, ... } ~~~ //?Get?stream?in?the?object?called?data $scope.myOptions?=?data.myOptions; The?good?thing?is,?you?have?a?pretty?flat?data?stream.?When?I?started?with?this?feature,?I?had?an?array?of?groups?each?containing?the?specific?items. ?It?was?not?possible?for?me?to?fill?a?select?box?that?way.?Instead,?I?refactored?some?of?my?code?to?what?you?can?see?above. ?Angular.js?would?take?care?of?the?grouping?on?it's?own. Here?is?my?select?definition: ~~~ <select ????ng-model="myOption" ????ng-options="value.id?as?value.label?group?by?value.group?for?value?in?myOptions"> ????<option>--</option> </select> ~~~ ng-model?is?the?name?of?the?property?which?will?reference?the?selected?option.?ng-options?is?the?directive?which?fills?the?dropdown.?It?deserves?a?bit?more?attention. You?will?understand?it?more?easily?if?you?read?it?from?right?to?left.?First?there?is: for?value?in?myOptions It?means?you'll?iterate?through?elements?which?are?stored?in?myOptions.?Every?element?will?become?available?in?this?expression?with?the?name?"value". The?next?part?is: group?by?value.group This?will?tell?Angular.js?to?make?up <optgroup> tags?and?the?label?attribute?will?be?filled?with?the?content?of?the?group?field. The?last?one?is: value.id?as?value.label In?this?case,?value.id?will?become?the?model?(stored?in?ng-model),?if?your?users?have?chosen?an?option.?If?you?would?delete?"value.id?as",?simply?the?whole?value?object?would?become?the?model. value.label does?exactly?what?it?looks?like:?it's?the?label?of?the?select?box. If?you?run?your?code,?you'll?see?something?like?that: ~~~ <optgroup?label="Group?1"> ???<option?value="0">Item?1</option> ???<option?value="1">Item?2</option> </optgroup> ~~~ Please?look?again?and?check?the?value?attribute?of?the?options.?You?might?have?expected?it's?matching?the?IDs?from?your?JSON,? but?that?is?not?the?case?(and?yes,?I?thought?like?this?initially).?Actually?this?is?an?increasing?number?and?references?the?position?of?the?model ?(which?is?an?array?in?my?case).?Don't?worry?about?that?-?if?you?select?your?option?the?correct?ID?will?be?selected?and?put?into?your?model.? Or,?if?you?leave?out?the?value.id?part?of?the?expression,?the?whole?selected?object?will?become?your?model.You?can?easily?test?it. ~~~ <select? ????ng-change="selectAction()" ????ng-model="myOption" ????ng-options="value.id?as?value.label?group?by?value.group?for?value?in?myOptions"> ????<option>--</option> </select> ~~~ ng-change?will?fire?if?the?user?has?chosen?something.?You?can?output?it?by?typing: ~~~ $scope.selectAction?=?function()?{ ????console.log($scope.myOption); }; ~~~ I?find?the?syntax?of?ng-options?pretty?much?counter?intuitive.?It?took?me?a?good?while?to?understand?it?and?I?was?glad?about?the?nice?help?on?the?AngularJS?mailinglist.? That?said,?I?think?more?examples?on?the?docs?and?an?improved?syntax?would?really?help.?Like: foreach?value?in?myOptions?use?value.label?as?label?use?value.id?as?model?group?by?value.group Here?is?a?working?JS?fiddle?example?which?illustrates?the?use?of?the?ng-select?directive:?http://jsfiddle.net/jm6of9bu/2/
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                              哎呀哎呀视频在线观看