{"id":11359,"date":"2022-09-27T02:55:27","date_gmt":"2022-09-26T21:25:27","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-implement-nested-data-form-in-angular2\/"},"modified":"2022-09-27T02:55:27","modified_gmt":"2022-09-26T21:25:27","slug":"solved-how-to-implement-nested-data-form-in-angular2","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-implement-nested-data-form-in-angular2\/","title":{"rendered":"[Solved] How to implement nested data form in angular2"},"content":{"rendered":"

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Here is your code, which sets the data you are receiving from backend, here I have stored it in a variable data<\/code>.<\/p>\n

Please notice, this is a shortened version of your form, but the basics are there, you only need to add the few missing properties in corresponding form arrays.<\/p>\n

The build of the empty form looks is just a FormArray<\/code> named work_experience<\/code> matching your json structure:<\/p>\n

this.myForm = this.fb.group({\n  work_experience: this.fb.array([])\n})\n<\/code><\/pre>\n
We add the fields when you are receiving the data, call a function called setWorkExperience<\/code> in the callback when receiving data:<\/p>\n
setWorkExperience(){\n  \/\/ get the formarray\n  let control = <FormArray>this.myForm.controls.work_experience;\n  \/\/ iterate the array 'work_experience' from your JSON and push new formgroup with properties and the inner form array\n  this.data.work_experience.forEach(x => {\n    \/\/ add the rest of your properties also below\n    control.push(this.fb.group({company: x.company, project_experience: this.setFormArray(x)}))\n  })\n}\n<\/code><\/pre>\n
setFormArray<\/code> is called from the previous function, where we patch the data with from project_experience<\/code> to the inner form array:<\/p>\n
setFormArray(x) {\n  \/\/ create local array which is returned with all the values from the 'project_experience' from your JSON\n  let arr = new FormArray([])\n  x.project_experience.map(y => {\n    \/\/ add the rest of your properties below\n    arr.push(this.fb.group({projectName: y.projectName}))\n  })\n  return arr;\n}\n<\/code><\/pre>\n
The template would then look like this:<\/p>\n
<form [formGroup]=\"myForm\">\n  <!-- Outmost array iterated -->\n  <div formArrayName=\"work_experience\">\n    <div *ngFor=\"let a of myForm.get('work_experience').controls; let i=index\">\n      <h3>COMPANY {{i+1}}: <\/h3>\n      <div formGroupName=\"{{i}}\">\n        <label>Company Name: <\/label>\n        <input formControlName=\"company\" \/><span><button (click)=\"deleteCompany(i)\">Delete Company<\/button><\/span><br><br>\n        <!-- inner formarray iterated -->\n        <div formArrayName=\"project_experience\">\n          <div *ngFor=\"let b of myForm.controls.work_experience.controls[i].controls.project_experience.controls; let j=index\">\n            <h4>PROJECT {{j+1}}<\/h4>\n            <div formGroupName=\"{{j}}\">\n              <label>Project Name:<\/label>\n              <input formControlName=\"projectName\" \/><span><button (click)=\"deleteProject(a.controls.project_experience, j)\">Delete Project<\/button><\/span>\n            <\/div>\n          <\/div>\n          <button (click)=\"addNewProject(a.controls.project_experience)\">Add new Project<\/button>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>   \n<\/form>\n<\/code><\/pre>\n
In the template you can see the buttons for add and delete of projects and companies. Adding and deleting companies are straightforward, where initCompany()<\/code> returns a formGroup:<\/p>\n
deleteCompany(index) {\n  let control = <FormArray>this.myForm.controls.work_experience;\n  control.removeAt(index)\n}\n\naddNewCompany() {\n  let control = <FormArray>this.myForm.controls.work_experience;\n  control.push(this.initCompany())\n}\n<\/code><\/pre>\n
In the add project we pass as parameter from the template the current formArray control, to which we just push a new FormGroup:<\/p>\n
addNewProject(control) {\n  control.push(this.initProject())\n}\n<\/code><\/pre>\n
In the delete function we pass the current formarray as well as the index of the project we want to delete:<\/p>\n
deleteProject(control, index) {\n  control.removeAt(index)\n}\n<\/code><\/pre>\n
That should cover pretty much everything. <\/p>\n
Plunker<\/a><\/h2>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            2<\/span> <\/p><\/div>\n<\/div>\n
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solved How to implement nested data form in angular2 <\/p>\n","protected":false},"excerpt":{"rendered":"
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The build of the … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[732,3112,356],"class_list":["post-11359","post","type-post","status-publish","format-standard","hentry","category-solved","tag-angular","tag-angular2-forms","tag-json"],"yoast_head":"\n[Solved] How to implement nested data form in angular2 - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-implement-nested-data-form-in-angular2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to implement nested data form in angular2 - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Here is your code, which sets the data you are receiving from backend, here I have stored it in a variable data. 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