AngularJS:文本绑定到JSON对象显示"对象物体QUOT; [英] AngularJS: textarea bind to JSON object shows "object-object"
问题描述
我是相当新的AngularJS。
我试图对象绑定到一个textarea。
HTML
< textarea的行数=5COLS =10NG-模式=菜单项preSET。>< / textarea的>
型号:
{
种:标题,
标签:ADD_TITLE
iconSrc:textTitle.png,
experimentInclude:,
experimentExclude:三
preSET:{
compType:richTitle,
styleId:txtNew
}
}
结果:
我怎样才能显示JSON字符串化(后来将其保存为一个对象再次)?
我刚刚研究了什么,我认为是这样做的最正确的方式,因为我需要为我的https://github.com/vorburger/MUI.js ......所以的这里是一个Plonker 我的解决方案。它是基于&安培;本质上是一种特殊的情况下(即一个应用程序)相关的Q 如何做angular.js双向过滤?中添加的转折是,模型的更新也应该改变文本框..这是什么手表$ / $ setViewValue / $渲染的东西呢。
VAR应用= angular.module('应用',[]);\r
\r
app.directive('jsonText',函数(){\r
返回{\r
限制:'A',//只激活元素属性\r
要求:'ngModel',//得到NgModelController的举行\r
链接:功能(范围,元素,ATTRS,ngModelCtrl){\r
\r
VAR lastValid;\r
\r
//推()如果不是的unshift(),并果更快。在IE8和更早的版本(不印字不)\r
ngModelCtrl $ parsers.push(FROMUSER)。\r
ngModelCtrl $ formatters.push(至用户)。\r
\r
//清除污点的变化无效\r
element.bind('模糊',函数(){\r
element.val(TOUSER($范围的eval(attrs.ngModel)));\r
});\r
\r
// $腕表(attrs.ngModel)如果此指令创建一个新的范围将无法正常工作;\r
//看到http://stackoverflow.com/questions/14693052/watch-ngmodel-from-inside-directive-using-isolate-scope如何做到这一点,然后\r
范围。$腕表(attrs.ngModel,功能(为newValue,属性oldValue){\r
lastValid = lastValid ||为newValue;\r
\r
如果(为newValue!=属性oldValue){\r
ngModelCtrl $ setViewValue(TOUSER(newValue)以)。\r
\r
// TODO避免这种情况导致丢失输入的焦点..\r
。ngModelCtrl $渲染();\r
}\r
},真正的); //必须使用objectEquality(真)在这里,由于某种原因..\r
\r
功能FROMUSER(文本){\r
//当心:TRIM()是不是在旧的浏览器可用\r
如果(!文本|| text.trim()===''){\r
返回{};\r
}其他{\r
尝试{\r
lastValid = angular.fromJson(文本);\r
ngModelCtrl $ setValidity('invalidJson',真)。\r
}赶上(E){\r
ngModelCtrl $ setValidity('invalidJson',虚假)。\r
}\r
返回lastValid;\r
}\r
}\r
\r
功能TOUSER(对象){\r
//比JSON.stringify()更好,因为它格式+过滤器hashKey $$等。\r
返回angular.toJson(对象,真正的);\r
}\r
}\r
};\r
});\r
\r
\r
app.controller(按Ctrl',['$范围',\r
功能($范围){\r
$ scope.model = {};\r
$ scope.model.data = {\r
种:标题,\r
标签:ADD_TITLE\r
iconSrc:textTitle.png,\r
experimentInclude:,\r
experimentExclude:三\r
preSET:{\r
compType:richTitle,\r
styleId:txtNew\r
}\r
};\r
}\r
]);
\r
&LT;脚本SRC =https://ajax.googleapis.com/ajax /libs/angularjs/1.2.23/angular.min.js\"></script>\r
&所述; SCRIPT SRC =https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js&GT;&下; /脚本&GT;\r
&LT; DIV NG-应用=应用程序级=容器&GT;\r
&LT; DIV NG控制器=CTRL级=行&GT;\r
&LT; textarea的JSON文本NG-模式='model.data行=15&GT;&LT; / textarea的&GT;\r
&所述p为H.; {{model.data}}&下; / P&GT;\r
&LT; / DIV&GT;\r
&LT; / DIV&GT;
\r
I am fairly new to AngularJS.
I am trying to bind an object to a textarea.
HTML:
<textarea rows="5" cols="10" ng-model="menuItem.preset"></textarea>
Model:
{
"kind": "title",
"label": "ADD_TITLE",
"iconSrc": "textTitle.png",
"experimentInclude": "",
"experimentExclude": "three",
"preset": {
"compType": "richTitle",
"styleId": "txtNew"
}
}
Result:
How can I show the JSON stringified (and later save it as an object again)?
I’ve just researched what I believe to be the most "proper" way of doing this, as I needed it for my https://github.com/vorburger/MUI.js... So here is a Plonker with my solution. It’s based on & is essentially a special case (i.e. an application of) the related Q How to do two-way filtering in angular.js? The added twist is that model updates should also change the textbox.. that's what the $watch / $setViewValue / $render thing does.
var app = angular.module('app', []);
app.directive('jsonText', function() {
return {
restrict: 'A', // only activate on element attribute
require: 'ngModel', // get a hold of NgModelController
link: function(scope, element, attrs, ngModelCtrl) {
var lastValid;
// push() if faster than unshift(), and avail. in IE8 and earlier (unshift isn't)
ngModelCtrl.$parsers.push(fromUser);
ngModelCtrl.$formatters.push(toUser);
// clear any invalid changes on blur
element.bind('blur', function() {
element.val(toUser(scope.$eval(attrs.ngModel)));
});
// $watch(attrs.ngModel) wouldn't work if this directive created a new scope;
// see http://stackoverflow.com/questions/14693052/watch-ngmodel-from-inside-directive-using-isolate-scope how to do it then
scope.$watch(attrs.ngModel, function(newValue, oldValue) {
lastValid = lastValid || newValue;
if (newValue != oldValue) {
ngModelCtrl.$setViewValue(toUser(newValue));
// TODO avoid this causing the focus of the input to be lost..
ngModelCtrl.$render();
}
}, true); // MUST use objectEquality (true) here, for some reason..
function fromUser(text) {
// Beware: trim() is not available in old browsers
if (!text || text.trim() === '') {
return {};
} else {
try {
lastValid = angular.fromJson(text);
ngModelCtrl.$setValidity('invalidJson', true);
} catch (e) {
ngModelCtrl.$setValidity('invalidJson', false);
}
return lastValid;
}
}
function toUser(object) {
// better than JSON.stringify(), because it formats + filters $$hashKey etc.
return angular.toJson(object, true);
}
}
};
});
app.controller('Ctrl', ['$scope',
function($scope) {
$scope.model = {};
$scope.model.data = {
"kind": "title",
"label": "ADD_TITLE",
"iconSrc": "textTitle.png",
"experimentInclude": "",
"experimentExclude": "three",
"preset": {
"compType": "richTitle",
"styleId": "txtNew"
}
};
}
]);
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<div ng-app="app" class="container">
<div ng-controller="Ctrl" class="row">
<textarea json-text ng-model='model.data' rows="15"></textarea>
<p>{{ model.data }}</p>
</div>
</div>
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