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我有以下問題。Resolving Promise Angular 2
在函數中我有一個承諾作爲返回類型。該功能位於類層次結構中。
updateNodeValues(entity: String, data: {}): Promise<any>{
let jsonBody = JSON.stringify(data);
let url = environment.endpointCore + '/api/' + entity + '/' + data['id'];
return this.http.put(url, jsonBody, this.options)
.toPromise()
.then(response => {
return response;
})
.catch(this.handleError);
}
此函數在類節點中。
onSubmit(): void{
var currentForm = this.form.value;
var entityName = this.inflection.classify(this.node.type).toLowerCase();
var requiredData = {};
for(var i = 0; i < this.formItems.length; i++){
this.formItems[i].value = currentForm[Object.keys(currentForm)[i]];
}
for(var i=0; i<this.formItems.length; i++){
requiredData[this.globalService.camelize(this.formItems[i].label)] = this.formItems[i].value
}
Promise.resolve(this.hierarchyService.updateNodeValues(entityName, requiredData)).then(response => {
alert(response.ok);
if(response.ok){
this.globalService.showSuccessMessage('Values updated');
this.refreshGui(requiredData);
}
});
this.editMode = false;
}
的問題是,當我試圖解決的承諾,並調用this.refreshGui(requireddata)
什麼也沒有發生。我已經閱讀了關於脂肪箭頭如何保留這個「上下文」,我不明白爲什麼調用這個方法沒有做任何事情,而調用successMessage
產生預期的結果。
我調用的方法如下所示,它也在類節點中。
private refreshGui(data: {}){
this._node.data = data;
this.objectProperties = new Array();
this.nodeChildren = new Array();
for (var property in data) {
var propertyValue = data[property];
if (propertyValue instanceof Array) {
this.nodeChildren.push({label: property, value: "total: ".concat(propertyValue.length.toString())});
} else {
this.objectProperties.push({label: property, value: propertyValue});
}
}
}