{"id":1885,"date":"2023-12-18T05:00:00","date_gmt":"2023-12-18T13:00:00","guid":{"rendered":"https:\/\/www.angulartraining.com\/daily-newsletter\/?p=1885"},"modified":"2023-12-15T14:52:14","modified_gmt":"2023-12-15T22:52:14","slug":"dynamic-forms-with-formarray","status":"publish","type":"post","link":"https:\/\/www.angulartraining.com\/daily-newsletter\/dynamic-forms-with-formarray\/","title":{"rendered":"Dynamic forms with FormArray"},"content":{"rendered":"\n

We’ve covered reactive and template-driven forms<\/a> in the past. One of the nice features of reactive forms is the FormArray<\/a><\/code> class. You can use FormArray<\/code> for a form where the number of inputs is dynamic and can increase or decrease:<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

To achieve the above, we create a FormArray<\/code> in our component and add a method so we can append new FormControls<\/code> to that array:<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

<\/p>\n\n\n\n

Then, we use a @for<\/code> block<\/a> to display all controls of that array in our template, including a button to add new names to the list. Note that we store the index of each control in a local variable i<\/code>:<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

<\/p>\n\n\n\n

We can even add support for the removal of form elements using the removeAt<\/code> method of FormArray<\/code> and the index of the element to remove:<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

<\/p>\n\n\n\n

And that’s it! We can check that the FormArray<\/code> value is updated correctly with the following expression:<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

<\/p>\n\n\n\n

You can see that code in action on Stackblitz here<\/a>. You can read this excellent guest post from Jennifer Wadella on my blog<\/a> for more information on dynamic forms.<\/p>\n","protected":false},"excerpt":{"rendered":"

We’ve covered reactive and template-driven forms in the past. One of the nice features of reactive forms is the FormArray class. You can use FormArray for a form where the number of inputs is dynamic and can increase or decrease: To achieve the above, we create a FormArray in our component and add a method […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,22],"tags":[],"class_list":["post-1885","post","type-post","status-publish","format-standard","hentry","category-angular","category-forms"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/1885","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/comments?post=1885"}],"version-history":[{"count":2,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/1885\/revisions"}],"predecessor-version":[{"id":1892,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/1885\/revisions\/1892"}],"wp:attachment":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/media?parent=1885"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/categories?post=1885"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/tags?post=1885"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}