Is it possible to dynamically change the text of an input placeholder? I am able to update the text using console.log, but the interface does not reflect the change. How can I make the interface recognize the updated placeholder text?
document.getElementById(this.implicKey).setAttribute('placeholder', options[i].implication);
console.log(document.getElementById(this.implicKey).getAttribute('placeholder'));
If you want to dynamically update the placeholder text for your input field, you can achieve it like this:
<md-input-container class="demo-full-width">
<input mdInput [(ngModel)]="firstname" placeholder="{{customPlaceholder}}" name="firstname" required>
<md-error>This field is required</md-error>
</md-input-container>
component.ts
customPlaceholder : string = "new value";
Now, you have the flexibility to change the value of customPlaceholder anywhere within the class.
To achieve this, we can utilize property binding.
In the HTML code, utilize square brackets like so:
<input formControlName="events" type="text" [placeholder]="dynamicPlaceholder">
In your typescript file, declare the property:
dynamicPlaceholder: string = "initial placeholder";
Subsequently, update the property value:
dynamicPlaceholder = "updated placeholder";
One alternative in the HTML code is to use square brackets along with attribute binding:
<input formControlName="events" type="text" [attr.placeholder]="newPlaceHolder">
To make this work, you need to declare the property in your typescript file:
newPlaceHolder: string = "text binding"
Here's a handy solution that I find effective:
(I utilize it to display dynamic errors on a mat-autocomplete form field)
Embed this code in your HTML:
[placeholder]="isPlaceHolderShowError('myFormControlName')"
Include this code in your TypeScript file:
isPlaceHolderShowError(myFormControlName) {
if (this.form.controls[myFormControlName].invalid && this.form.controls[myFormControlName].touched) {
return 'this is my error text'
}
return 'this is the initial placeholder'
}
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