{"id":18890,"date":"2022-11-02T07:00:50","date_gmt":"2022-11-02T01:30:50","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-reactiveform-for-dynamically-updated-form-entries\/"},"modified":"2022-11-02T07:00:50","modified_gmt":"2022-11-02T01:30:50","slug":"solved-reactiveform-for-dynamically-updated-form-entries","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-reactiveform-for-dynamically-updated-form-entries\/","title":{"rendered":"[Solved] ReactiveForm for dynamically updated form entries"},"content":{"rendered":"

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If you use ReactiveForm, you need use a FormArray
\nA FormArray can be of FormControl or a FormGroup<\/p>\n

FormArray of FormControls<\/p>\n

constructor(private fb:FormBuilder) {}\nngOnInit() {\n    \/\/We create an array of FormControl, each question a FormControl\n    let data:FormControl[]=this.questions.map(q=>new FormControl());\n\n    this.myform=this.fb.group({\n      questions:new FormArray(data)\n    })\n}\n\/\/the .html\n<!--we use *ngIf to show the form only when we create the form-->\n<div *ngIf=\"myform\"  [formGroup]=\"myform\">\n  <!--we iterate to myForm.get('questions').controls -->\n  <!--we use our variable \"questions\" to show the label and options-->\n  <div *ngFor=\"let question of myform.get('questions').controls;let i=index\">\n      <label>{{questions[i].question}}<\/label>\n      <select required [formControl]=\"question\" >\n         <option value=\"null\" disabled=\"disabled\">Option<\/option>\n         <option *ngFor=\"let option of questions[i].options\">{{option}}<\/option>\n      <\/select>\n  <\/div>\n<\/div>\n<!--just for check-->\n{{myform?.value |json}}\n<\/code><\/pre>\n
If we use an array of formGroup we change some things<\/p>\n
constructor(private fb:FormBuilder) {}\nngOnInit() {\n    \/\/we create and array of FormGroup\n    let data2:FormGroup[]=this.questions.map(q=>this.fb.group({\n      option:null\n    }));\n\n    this.myform2=this.fb.group({\n      questions:new FormArray(data2)\n    })\n}\n<div *ngIf=\"myform2\"  [formGroup]=\"myform2\">\n  <!--see that we say to Angular the \"formArrayName\" -->\n  <div formArrayName=\"questions\">\n    <div *ngFor=\"let question of myform2.get('questions').controls;\n        let i=index\" [formGroupName]=\"i\"> <!--don't forget formGroupName-->\n        <label>{{questions[i].question}}<\/label>\n        <!--the select use formControlName, our array is an array of FormGroup-->\n        <select required formControlName=\"option\" >\n           <option value=\"null\" disabled=\"disabled\">Option<\/option>\n           <option *ngFor=\"let option of questions[i].options\">{{option}}<\/option>\n        <\/select>\n    <\/div>\n  <\/div>\n  <\/div>\n  {{myform2?.value |json}}\n<\/code><\/pre>\n
Aclaration:@FrontEndDeveloper. One thing is the array question that we use to make the questions.(Perhafs I must be choose other names to the variables), other thing is the value of the form. The value of myform1={questions:[“20″,”1″]}, the value of myform2={questions:[{option:”20″},{option:”2”}]}. <\/p>\n
When we create an array of FormControl (or an array of FbGroup) I used map, equally I can do some like<\/p>\n
let data:FormControl[]=[];\ndata.push(new FormControl());\ndata.push(new FormControl());\n<\/code><\/pre>\n
or<\/p>\n
let data2:FormGroup[]=[];\ndata2.push(this.fb.group({\n          option:null\n        }));\ndata2.push(this.fb.group({\n          option:null\n        }));\n<\/code><\/pre>\n
Generally we have some data to initialize the form. (an object with some data) that we get from a dbs<\/p>\n
\/\/Imagine we have mydata{name:\"A\",options=[\"20\",\"1\"]}\n\/\/we can map this data to create the form\nlet data:FormControl[]=this.mydata.options.map(q=>new FormControl(q));\n\/\/or\n   let data2:FormGroup[]=this.mydata.options.map(q=>this.fb.group({\n          option:q\n        }));\n\n\/\/Imagine we have mydata{name:\"A\",options=[{option:\"20\"},{option:\"1\"}]}\n\/\/we can map this data to create the form\nlet data:FormControl[]=this.mydata.options.map(q=>new FormControl(q.option));\n\/\/or\n   let data2:FormGroup[]=this.mydata.options.map(q=>this.fb.group({\n          option:q.option\n        }));\n<\/code><\/pre>\n<\/p><\/div>\n
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solved ReactiveForm for dynamically updated form entries <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] If you use ReactiveForm, you need use a FormArray A FormArray can be of FormControl or a FormGroup FormArray of FormControls constructor(private fb:FormBuilder) {} ngOnInit() { \/\/We create an array of FormControl, each question a FormControl let data:FormControl[]=this.questions.map(q=>new FormControl()); this.myform=this.fb.group({ questions:new FormArray(data) }) } \/\/the .html <!–we use *ngIf to show the form only … 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":[732,1289,346],"class_list":["post-18890","post","type-post","status-publish","format-standard","hentry","category-solved","tag-angular","tag-angular-reactive-forms","tag-html"],"yoast_head":"\n[Solved] ReactiveForm for dynamically updated form entries - 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-reactiveform-for-dynamically-updated-form-entries\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] ReactiveForm for dynamically updated form entries - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] If you use ReactiveForm, you need use a FormArray A FormArray can be of FormControl or a FormGroup FormArray of FormControls constructor(private fb:FormBuilder) {} ngOnInit() { \/\/We create an array of FormControl, each question a FormControl let data:FormControl[]=this.questions.map(q=>new FormControl()); this.myform=this.fb.group({ questions:new FormArray(data) }) } \/\/the .html <!--we use *ngIf to show the form only ... 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