Question

这是我的ngOnInit功能

 instance.input = document.getElementById('google_places_ac');
        autocomplete = new google.maps.places.Autocomplete(instance.input, { types: ['(cities)']});
        google.maps.event.addListener(autocomplete, 'place_changed', function () {
            var place = autocomplete.getPlace();
            instance.setValue(place.address_components[3].long_name, place.address_components[2].long_name, place.address_components[1].long_name);

         });

这是我的setValue()函数

public setValue(a,b,c) {
    this.coutnry = a;
    this.state = b;
    this.city = c;
    this.sharedService.country = this.coutnry;
    this.sharedService.city = this.city;
    this.sharedService.state = this.state;
    console.log(a, b, c);
}

及以下是我要显示和获取值的html模板

 <input id="google_places_ac" attr.state="{{state}}" attr.country="{{coutnry}}" name="google_places_ac" type="text" value="{{city}}" class="form-control" />

问题是我的html属性在调用place_changed函数后没有得到更新，有什么办法可以在视图上获取更新值吗？

Answer 1

您可以查看此angular2官方文档以设置属性

备忘单 - https://angular.io/docs/ts/latest/cheatsheet.html

am_buttons

更新

<input id="google_places_ac" [attr.state]="state" [attr.country]="coutnry"
name="google_places_ac" type="text" value="{{city}}" class="form-control" />

Answer 2

您应该通过在[]

中包装属性来使用属性绑定

<input id="google_places_ac" [attr.state]="state" [attr.country]="coutnry" 
 name="google_places_ac" type="text" [value]="city" class="form-control" />

另外一件事是，你在编写country时写了coutnry，而不是在两个地方写了this.sharedService.country = this.coutnry; //in constructor attr.country="{{coutnry}}" //second place。

var $canvas = {
    activePaths: []
};

// Bind to `onMouseDown` event.
function onMouseDown = function (options) {

    var mousePos = canvas.getPointer(options.e);
    mousePos.x = parseInt(mousePos.x);
    mousePos.y = parseInt(mousePos.y);

    var width =  canvas.getWidth();
    var height = canvas.getHeight();

    var pixels = canvas.getContext().getImageData(0, 0, width, height);
    var pixel = (mousePos.x + mousePos.y * pixels.width) * 4;

    var activePathsColor = new fabric['Color']('rgb(' + pixels.data[pixel] + ',' + pixels.data[pixel + 1] + ',' + pixels.data[pixel + 2] + ')');
    var colorHex = '#' + activePathsColor.toHex().toLowerCase();

    var activeObject = canvas.getActiveObject();
    var activePath = [];

    // Check if active objects are type of `group`, if so push the selected path.
    if(activeObject.type == 'group') {

          for (var i = 0; i < activeObject.getObjects().length; i++) {
            var path = activeObject.getObjects()[i];
            if (path.getFill().toLowerCase() == colorHex) {
                $canvas.activePaths.push(path);
            }
        }

    }

}

数据更新后，视图中的值不会更新，angular2和typescript

2 个答案: