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<li >CustomErrorStateMatcher</li>
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<code>src/app/_helpers/custom-error-state-matcher.ts</code>
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<p class="comment">
<h3>Description</h3>
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<p>Custom provider that defines how form controls behave with regards to displaying error messages.</p>
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<h3>Implements</h3>
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<code>ErrorStateMatcher</code>
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<h3 id="index">Index</h3>
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<h6><b>Methods</b></h6>
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<a href="#isErrorState" >isErrorState</a>
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Methods
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<a name="isErrorState"></a>
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<span ><b>isErrorState</b></span>
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<code>isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null)</code>
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<div class="io-line">Defined in <a href="" data-line="17"
class="link-to-prism">src/app/_helpers/custom-error-state-matcher.ts:17</a></div>
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<div class="io-description"><p>Checks whether an invalid input has been made and an error should be made.</p>
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<b>Parameters :</b>
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<td>Name</td>
<td>Type</td>
<td>Optional</td>
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<td>Description</td>
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</tr>
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<td>control</td>
<td>
<code>FormControl | null</code>
</td>
<td>
No
</td>
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<td>
<ul>
<li>Tracks the value and validation status of an individual form control.</li>
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<td>form</td>
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<code>FormGroupDirective | NgForm | null</code>
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<td>
No
</td>
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<li>Binding of an existing FormGroup to a DOM element.</li>
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<b>Returns : </b> <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/boolean" target="_blank" >boolean</a></code>
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<div class="io-description">
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<p>true - If an invalid input has been made to the form control.</p>
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<pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import { ErrorStateMatcher } from &#x27;@angular/material/core&#x27;;
import { FormControl, FormGroupDirective, NgForm } from &#x27;@angular/forms&#x27;;
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/**
* Custom provider that defines how form controls behave with regards to displaying error messages.
*
*/
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export class CustomErrorStateMatcher implements ErrorStateMatcher {
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/**
* Checks whether an invalid input has been made and an error should be made.
*
* @param control - Tracks the value and validation status of an individual form control.
* @param form - Binding of an existing FormGroup to a DOM element.
* @returns true - If an invalid input has been made to the form control.
*/
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isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
const isSubmitted: boolean &#x3D; form &amp;&amp; form.submitted;
return !!(control &amp;&amp; control.invalid &amp;&amp; (control.dirty || control.touched || isSubmitted));
}
}
</code></pre>
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