How to get textbox value at runtime

Question

0.00/5 (No votes)

See more:

I have a textbox in blazor

<input type="text" id="lblname" @bind="@value" />

At runtime I assigned textbox value as 1 through javascript.

document.getElementById("lblname").value = 1

It is displaying in a page.

However, I want to save the assigned textbox value to a variable. When I assign

id=@value

It always shows null value.
Iam not entering in textbox at runtime. Instead value is assigned. How to get the changed textbox value

What I have tried:

I have a textbox in blazor

<pre><input type="text" id="lblname" @bind="@value" />

At runtime I assigned textbox value as 1 through javascript.

document.getElementById("lblname").value = 1

It is displaying in a page.

However, I want to save the assigned textbox value to a variable. When I assign

id=@value

It always shows null value.
Iam not entering in textbox at runtime. Instead value is assigned. How to get the changed textbox value

Posted 14-Sep-21 20:12pm

Member 13964245

Updated 14-Sep-21 21:57pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2021-09-14T21:57:00

Apparently, setting the value directly via Javascript doesn't trigger the necessary events for Blazor to notice the update.

This StackOverflow thread has a couple of suggestions for you to try:
c# - Changing an Input value in Blazor by javascript doesn't change it's binded property value - Stack Overflow[^]

Either trigger the change event after setting the value:

JavaScript

const lbl = document.getElementById("lblname");
lbl.value = 1;
lbl.dispatchEvent(new Event("change"));

or invoke a C# method to update your property:

JavaScript

DotNet.invokeMethodAsync('UpdateValue', '1');

C#

public void UpdateValue(string newValue)
{
    value = newValue;
}