javascript - AngularJS : ng-show complex conditions problems with IE9 -

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the below code works in browsers including ie10. has problems in ie9. guessing there no syntax error or logic error in code, may need different way write condition in ng-show

   <div class="control-group" ng-show="!waste.id" style="display:inline-block">       <label class="control-label" for="shipments">treatment or shipment frequency</label>       <div class="controls controls-row">         <div>           <input type="number" id="shipments" name="shipments" maxlength="50" ng-required="!waste.id && !nochange" ng-model="waste.shipments" ng-disabled="nochange" placeholder="shipment" class="input-small" step="any">           <i class="inline icon-info-sign" ng-show="form.shipments.$invalid || form.shipments.$error.required == true"></i>           <span class="help-inline">times per</span>         </div>         <div>           <input type="number" id="frequency" name="frequency" maxlength="50" ng-required="!waste.id && !nochange" ng-model="waste.frequency" ng-disabled="nochange" placeholder="frequency" class="input-small" step="any">           <i class="inline icon-info-sign" ng-show="form.frequency.$error.required == true || form.frequency.$invalid"></i>           <span class="help-inline">year(s)</span>         </div>       </div>     </div>

as can see "treatment , shipment frequency" number , valid when entered value number , required == true. conditions when try evaluate differently, came know expression $invalid won't work meaning type=number , $invalid might have problem in ie9 , that's why <i> tag won't go away. happening in ie9. can me


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