Using an HTML string to set values in an Angular reactive form

Question

Using an HTML string to set values in an Angular reactive form

I'm attempting to assign a string value with HTML tags to a control using the patchValue method. However, the HTML tags are being rendered as plain text for some unknown reason.

<textarea rows="5" name="myField" formControlName="myField" readonly></textarea>

const htmlStr = '<p>HTML Content HERE</p>'
// assuming the form group instance is already created
this.form.get('myField').patchValue(this.htmlStr);

The Angular API documentation doesn't provide much information on how patchValue handles HTML values and is quite generic in this aspect.

javascript angular typescript angular-reactive-forms

Answer 1

Answer №1

When inserting an HTML string into a textarea, it will always appear as plain HTML within the textarea.

The [innerHTML] attribute can only be used with span, div, or paragraph elements. If you try to use it within an input field, the HTML tags will not render as expected, but instead display as raw text.

However, you can still insert an HTML string into your textarea, but keep in mind that it won't display as fully styled HTML markup.

For an example, you can check out this StackBlitz demo here.

Answer 2

When inserting an HTML string into a textarea, it will always appear as plain HTML within the textarea.

The [innerHTML] attribute can only be used with span, div, or paragraph elements. If you try to use it within an input field, the HTML tags will not render as expected, but instead display as raw text.

However, you can still insert an HTML string into your textarea, but keep in mind that it won't display as fully styled HTML markup.

For an example, you can check out this StackBlitz demo here.

Answer 3

Answer №2

One possible reason for the error could be that you are passing a data type of string instead of a DOM element.

Here is an example to illustrate:

var newElement = document.createElement("div");
newElement.textContent = 'CONTENT HERE';
this.form.get('myField').patchValue(this.newElement);

Certain libraries, such as jQuery, offer simpler ways to create DOM elements.
For instance:

// Assuming jQuery has been loaded
var stringDOM = '<div>' +
  '<p>Some HTML content here</p>' +
'</div>';
var $jQueryObject            = $.parseHTML(stringDOM);
var domElement               = $jQueryObject[0];
this.form.get('myField').patchValue(this.domElement);

Answer 4

One possible reason for the error could be that you are passing a data type of string instead of a DOM element.

Here is an example to illustrate:

var newElement = document.createElement("div");
newElement.textContent = 'CONTENT HERE';
this.form.get('myField').patchValue(this.newElement);

Certain libraries, such as jQuery, offer simpler ways to create DOM elements.
For instance:

// Assuming jQuery has been loaded
var stringDOM = '<div>' +
  '<p>Some HTML content here</p>' +
'</div>';
var $jQueryObject            = $.parseHTML(stringDOM);
var domElement               = $jQueryObject[0];
this.form.get('myField').patchValue(this.domElement);

Using an HTML string to set values in an Angular reactive form

Answer №1

Answer №2

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