Encountering 'null' error in template with Angular 4.1.0 and strictNullChecks mode

After updating Angular to version 4.1.0 and activating "strictNullChecks" in my project, I am encountering numerous errors in the templates (.html) that look like this:

An object may be 'null'

All these errors are pointing to .html templates similar to this one:

<form class="ui equal width form attached segment" [formGroup]="usrFrm">
    <h4 class="ui dividing blue header">User Name</h4>
    <div class="fields">
        <div class="required field">
            <label>Title</label>
            <select class="ui dropdown">
                <option default>&lt;select title&></option>
                <option value="1">Ms.</option>
                <option value="0">Mr.</option>
            </select>
        </div>
    </div>
    <div class="fields">
        <div class="required field" [class.error]="usrFrm.touched && usrFrm.get('firstName').invalid">
            <label>First name</label>
            <input type="text" formControlName="firstName" placeholder="First Name" />
        </div>
        <div class="field" [class.error]="usrFrm.touched && usrFrm.get('middleName').invalid">
            <label>Middle name</label>
            <input type="text" formControlName="middleName" placeholder="Middle Name" />
        </div>
        <div class="required field" [class.error]="usrFrm.touched && usrFrm.get('lastName').invalid">
            <label>Last name</label>
            <input type="text" formControlName="lastName" placeholder="Last Name" />
        </div>
    </div>
...

Is there a solution to resolve these issues without disabling "strictNullChecks"?

Answer №1

Currently encountering a problem with TypeScript, as discussed in this GitHub issue. We will have to be patient for the next release.

Answer №2

If you're encountering the 'Object is possibly 'null'' TypeScript prompt popup, have you considered using

usrFrm.controls.firstName.invalid
? It's another approach to accessing the invalid state that worked for me in a similar situation.

Answer №3

To modify strict checks configurations: Within tsconfig.json

    compilerOptions:{

       "suppressImplicitAnyIndexErrors": true,
       "strictNullChecks":false,
       "strictPropertyInitialization": false,

     }

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