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<ol class="breadcrumb">
  <li>Classes</li>
  <li>CustomErrorStateMatcher</li>
</ol>

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            <a href="#info" role="tab" id="info-tab" data-toggle="tab" data-link="info">Info</a>
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            <a href="#source" role="tab" id="source-tab" data-toggle="tab" data-link="source">Source</a>
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        <p class="comment">
            <h3>File</h3>
        </p>
        <p class="comment">
            <code>src/app/_helpers/custom-error-state-matcher.ts</code>
        </p>

            <p class="comment">
                <h3>Description</h3>
            </p>
            <p class="comment">
                <p>Custom provider that defines how form controls behave with regards to displaying error messages.</p>

            </p>


            <p class="comment">
                <h3>Implements</h3>
            </p>
            <p class="comment">
                        <code>ErrorStateMatcher</code>
            </p>


            <section>
    <h3 id="index">Index</h3>
    <table class="table table-sm table-bordered index-table">
        <tbody>

                <tr>
                    <td class="col-md-4">
                        <h6><b>Methods</b></h6>
                    </td>
                </tr>
                <tr>
                    <td class="col-md-4">
                        <ul class="index-list">
                            <li>
                                <a href="#isErrorState">isErrorState</a>
                            </li>
                        </ul>
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            <section>
    
    <h3 id="methods">
        Methods
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            <tr>
                <td class="col-md-4">
                    <a name="isErrorState"></a>
                    <span class="name">
                        <b>
                            isErrorState
                        </b>
                        <a href="#isErrorState"><span class="icon ion-ios-link"></span></a>
                    </span>
                </td>
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            <tr>
                <td class="col-md-4">
<code>isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null)</code>
                </td>
            </tr>


            <tr>
                <td class="col-md-4">
                    <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>
                </td>
            </tr>


            <tr>
                <td class="col-md-4">
                    <div class="io-description"><p>Checks whether an invalid input has been made and an error should be made.</p>
</div>

                    <div class="io-description">
                        <b>Parameters :</b>
                        <table class="params">
                            <thead>
                                <tr>
                                    <td>Name</td>
                                    <td>Type</td>
                                    <td>Optional</td>
                                    <td>Description</td>
                                </tr>
                            </thead>
                            <tbody>
                                <tr>
                                    <td>control</td>
                                    <td>
                                            <code>FormControl | null</code>
                                    </td>

                                    <td>
                                        No
                                    </td>


                                    <td>
                                        <ul>
<li>Tracks the value and validation status of an individual form control.</li>
</ul>

                                    </td>
                                </tr>
                                <tr>
                                    <td>form</td>
                                    <td>
                                            <code>FormGroupDirective | NgForm | null</code>
                                    </td>

                                    <td>
                                        No
                                    </td>


                                    <td>
                                        <ul>
<li>Binding of an existing FormGroup to a DOM element.</li>
</ul>

                                    </td>
                                </tr>
                            </tbody>
                        </table>
                    </div>
                    <div>
                    </div>
                    <div class="io-description">
                        <b>Returns : </b>        <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/boolean" target="_blank" >boolean</a></code>

                    </div>
                    <div class="io-description">
                        <p>true - If an invalid input has been made to the form control.</p>

                    </div>
                </td>
            </tr>
        </tbody>
    </table>
</section>





    </div>


    <div class="tab-pane fade  tab-source-code" id="c-source">
        <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;;

/**
 * Custom provider that defines how form controls behave with regards to displaying error messages.
 *
 */
export class CustomErrorStateMatcher implements ErrorStateMatcher {
  /**
   * 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.
   */
  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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