如何将数据从服务分配给 JSON? [英] How to assign data from service to JSON?
问题描述
我正在制作 angular 6 应用程序,我正在制作一个 angular 动态形式,其中数据作为动态来自 JSON.
I am making angular 6 application, where i am making a angular dynamic form in which the data comes as dynamic from JSON.
JSON:
jsonData: any = [
{
"elementType": "textbox",
"class": "col-12 col-md-4 col-sm-12",
"key": "project_name",
"label": "Project Name",
"type": "text",
"value": "",
"required": false,
"minlength": 3,
"maxlength": 20,
"order": 1
},
{
"elementType": "textbox",
"class": "col-12 col-md-4 col-sm-12",
"key": "project_desc",
"label": "Project Description",
"type": "text",
"value": "",
"required": true,
"order": 2
},
{
"elementType": "dropdown",
"key": 'project',
"label": 'Project Rating',
"options": [
{ "key": 'average', "value": 'Average' },
{ "key": 'good', "value": 'Good' },
{ "key": 'great', "value": 'Great' }
],
"order": 3
}
];
在下拉列表中,我想要来自服务调用的 options
数组..
Here in dropdown, i would like to have the options
array from the service call..
到目前为止,您可以看到我在选项中对其进行了硬编码..
As of now you could able to see that i have hard coded it in options..
dynamic-form.component.ts
中的服务:
getDropdownValues(url,token) {
this.service.get(url,token).subscribe(res => {
console.log(res.data);
});
}
res.data 返回以下内容,
{
data: [
{ "key": 'average', "value": 'Average' },
{ "key": 'good', "value": 'Good' },
{ "key": 'great', "value": 'Great' }
]
}
这个数据数组将成为 JSON 中的 options
..
This data array is going to be the options
in JSON..
到目前为止,我已经在 .ts
文件中提供了 JSON,但稍后它将是一个单独的 .json
文件.
As of now i have given the JSON inside .ts
file but later it will be a separate .json
file.
有效的stackblitz:https://stackblitz.com/编辑/angular-x4a5b6-ng8m4z
请帮助我将来自服务 (res.data) 的数据放到 JSON 中的下拉 options
中..
Kindly help me to place the data comes from service (res.data) to the dropdown options
inside JSON..
推荐答案
你必须问自己你收到什么数据以及你需要什么数据.一般来说,你可以有,例如</p>
you must ask yourself about what data you receive and what data do you need. In general you can has,e.g.
getOptions():Observable<any[]>
{
//of, create an observable
return of(
[{key:"option1",data:["option1_1","option_1_2"]},
{key:"option2",data:["option2_1","option_2_2","option_2_3]},..
])
}
getModel():Observable<any[]>
{
return of(
[{key:"option1",...},
{key:"option2",..}
])
}
您必须使用 switchMap 来接收 fullModel.switchmap 使您不会收到第一个电话,否则是内部电话.是一种不连接订阅的方法
You must use switchMap to received the fullModel. switchmap make that you don't receive the first call else the inner one. is a way to not encatenate subscribe
getFullMode():Observable<any[]>
{
return getOptions().pipe(switchMap(
opts=>{
return getModel().pipe(map(mod=>{
//..here transform "mod" using the values of opts
//e.g.
let option=opts.find(p=>p.key=mod.key);
mod.options=option.data
}))
})
)
}
好吧,你的case比较容易,因为只有一个选项"和一个唯一的选项",anf json是固定的.
Well, you case is easer because only has an "option" and a unique "option", anf json is fixed.
getFullJson(url,token)
{
this.service.get(url,token).pipe(map(opt=>{
//we don't want return opt, else this.jsonData transformed.
let element=this.jsonData.find(e=>e.elementType=='dropdown');
if (element)
element.option=res.data
return this.jsonData
}))
}).subscribe(res=>console.log(res));
如果你的json来自一个observable,不使用map,使用switchmap.SwitchMap,等待外层调用结束进行第二次
If your json comes from an observable, not use map, use switchmap. SwitchMap, wait the outer call end to make the second
getFullJson(url,token) {
this.service.get(url,token).pipe(switchMap(opt=>{
//we don't want return opt, else this.jsonData transformed.
//to transform data use pipe(map)
return this.service.getJsonData(pipe(map(jsonData=>{
let element=jsonData.find(e=>e.elementType=='dropdown');
if (element)
element.option=res.data
return this.jsonData
}))
}).subscribe(res=>console.log(res));
这篇关于如何将数据从服务分配给 JSON?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!