使用 jquery element.val() 时，ng

本文介绍了使用 jquery element.val() 时，ng-model 未更新的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

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我正在使用某些版本的 jquery 自动完成功能作为 angularjs 指令.当 jquery 使用 element.val() 更新输入值时，angular 直到下一个摘要(我想)之后才会注意到变化.

I'm using some version of jquery autocomplete as an angularjs direcitve. When the jquery updates the input's value using element.val() angular does no notice the change until after the next digest ( i suppose ).

我的第一个想法是使用 $timeout 对 ng-model 帖子摘要执行操作，但如您所见，它没有帮助.

My first thought was to perform the action on the ng-model post digest using $timeout but as you can see it didn't help.

我的第二种方法是覆盖元素的 val 函数以触发 input 事件，但我还没有设法让它工作.

My second approach was to override the element's val function to trigger an input event but I haven`t managed to make it work.

尝试从自动完成列表中选择一个值，您会看到上面的 ng-model 没有更新.

Try to select a value from the autocomplete list and you'll see that the ng-model above is not updating.

更新

感谢您的回复.我不知道 onSelect 选项.

Thanks for the response. I didn't know about the onSelect option.

这是根据您的建议编写的代码

This is the code based on your recommendations

// clone user provided options 
scope.options = _.extend({}, scope.AutoCompleteOptions());

// Wrap onSelect - Force update before manipulation on ng-model
var fn = _.has(scope.AutoCompleteOptions(), 'onSelect')  ? scope.AutoCompleteOptions().onSelect : _.noop;
scope.options.onSelect = function () { 
  ngModelCtrl.$setViewValue(element.val()); 
  scope.$apply(fn);
};

scope.autocomplete = $(element).autocomplete(scope.options);

通过这种方式，我维护指令的接口，同时保证 ng-model 将是最新的.

This way i maintain the interface of the directive while guarantying that ng-model will be up to date.

谢谢.

推荐答案

正如您已经知道的，问题是 angular 不知道 jquery 插件所做的更新.幸运的是，您可以使用插件的 onSelect 回调来更新 ngModel，如下所示:

As you already knew, the problem is angular doesn't aware of the update made by jquery plugin. Luckily, you can use the plugin's onSelect callback to update ngModel, like this:

.directive("autoComplete", function() {
    return {
        restrict: "A" , 
        require: 'ngModel', // require ngModel controller
        scope: {
            AutoCompleteOptions : "=autoCompleteOptions", // use '=' instead of '&'
        },
        link: function (scope, element, attrs, ngModelCtrl) {

            // prevent html5/browser auto completion
            attrs.$set('autocomplete','off');

            // add onSelect callback to update ngModel
            scope.AutoCompleteOptions.onSelect = function() {
                scope.$apply(function() {
                    ngModelCtrl.$setViewValue(element.val());
                });
            };

            scope.autocomplete = $(element).autocomplete(scope.AutoCompleteOptions);
        }
    }
});

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