Blazor doesn’t manipulate the DOM directly at C# side. You cancall the JavaScript method by using JavaScript Interop to get an element by ID or class.
- The getElementsByClassName() method returns a collection of all elements in the document with the specified class names.
- The getElementById() method returns a collection of all elements in the document with the specified ID names.
@page "/"
@inject IJSRuntime JsRuntime
<h1 id="headingElement">Hello, world!</h1>
<p class="para-element">Welcome to your new app.</p>
@code {
protected override async void OnAfterRender(bool firstRender)
{
await JsRuntime.InvokeVoidAsync("elementId");
}
}
<body>
. . .
. . .
<script>
function elementId() {
// Get element with the specified ID name
var idValue = document.getElementById("headingElement");
console.log(idValue.innerHTML);
// Get element with the specified Class name
var classValue = document.getElementsByClassName("para-element");
console.log(classValue[0].innerHTML);
}
</script>
</body>