Angular ng-repeat 單選框預設選中第一個
阿新 • • 發佈:2019-01-26
1.多個input的type=”radio”不使用ng-repeat正常獲取value值。
<div class="weui-cells weui-cells_radio">
<label class="weui-cell weui-check__label" for="[[cardFaceNo]]" >
<div class="weui-cell__bd">
<p ng-bind="cardFaceNo"></p>
</div>
<div class="weui-cell__ft">
<input type="radio" class="weui-check" name="radio1" id="[[cardFaceNo]]" ng-model="cardRadio" value="123456">
<span class="weui-icon-checked"></span>
</div>
</label>
<a href="javascript:void(0);" class="weui-cell weui-cell_link" ng-click="toBindCard()">
<div class="weui-cell__bd" ng-bind="card" ></div>
</a>
</div>
js
$scope.toClaimPrize = function(){
alert($scope.cardRadio)
};
2.使用ng-repeat導致無法正確獲取value值
html
<div class="weui-cells weui-cells_radio" >
<label class="weui-cell weui-check__label" ng-repeat="cardInfo in userBasicInfo.cardInfoList" for="[[cardInfo.cardFaceNo]]" >
<div class="weui-cell__bd">
<p ng-bind="cardInfo.cardFaceNo"></p>
</div>
<div class="weui-cell__ft">
<input type="radio" class="weui-check" name="radio1" id="[[cardInfo.cardFaceNo]]" ng-model="cardRadio" value="[[cardInfo.cardFaceNo]]">
<span class="weui-icon-checked"></span>
</div>
</label>
<a href="javascript:void(0);" class="weui-cell weui-cell_link" ng-click="toBindCard()">
<div class="weui-cell__bd" ng-bind="cardOperation" ></div>
</a>
</div>
js
$scope.toClaimPrize = function(){
alert($scope.cardRadio)
};
3.問題原因及解決方案
原因:
因為在ng-repeat中,$scope的作用域不是全域性的,相當於區域性變數,無法在全域性訪問到其中變數。所以要使用$parent來使其成為全域性變數,可全域性訪問。
解決方案:
若使用ng-repeat則必須在ng-model中加入$parent
示例程式碼:
<div class="weui-cells weui-cells_radio">
<label class="weui-cell weui-check__label" ng-repeat="cardInfo in userBasicInfo.cardInfoList" for="[[cardInfo.cardFaceNo]]" >
<div class="weui-cell__bd">
<p ng-bind="cardInfo.cardFaceNo"></p>
</div>
<div class="weui-cell__ft">
<input type="radio" class="weui-check" name="radio1" id="[[cardInfo.cardFaceNo]]" ng-model="cardRadio" value="[[cardInfo.cardFaceNo]] ng-model="$parent.cardRadio" value="[[cardInfo.cardFaceNo]]" ng-checked="$index==0?true:false">
<span class="weui-icon-checked"></span>
</div>
</label>
<a href="javascript:void(0);" class="weui-cell weui-cell_link" ng-click="toBindCard()">
<div class="weui-cell__bd" ng-bind="cardOperation" ></div>
</a>
</div>
其中
ng-checked="$index==0?true:false"
是判斷第一項單選框是否預設選中。但是也有人說
$index這個東西很危險,不要亂用
不知道是否還有其他方式。