How to Display Input Errors in Popup

How to display input errors in popup?

try this..

final EditText editText=(EditText) findViewById(R.id.edit);

 editText.setImeActionLabel("",EditorInfo.IME_ACTION_NEXT);

        editText.setOnEditorActionListener(new OnEditorActionListener() {

            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if(actionId==EditorInfo.IME_ACTION_NEXT){
                    if( editText.getText().toString().trim().equalsIgnoreCase(""))
                        editText.setError("Please enter some thing!!!");
                    else
                        Toast.makeText(getApplicationContext(),"Notnull",Toast.LENGTH_SHORT).show();
                }
                return false;
            }
        });

Use Popup to display Input Error message in React-Semantic-UI

I think there is a way to achieve that, but not by using the PopUp component. To achieve that see the semantic-ui-react documentation on Forms with Label (pointing).
You can use the logic illustrated in the code below:

import React, { Component } from 'react'
import { Form, Label, Input, Button } from 'semantic-ui-react'

export default class MyCustomForm extends Component {
  constructor(props){
    super(props)
  }
  this.state = {
    input1: 'some value',
    input2: '',
    errors: {
      input1: 'Input 1 error message'
    }
    this.onChange = this.onChange.bind(this)
    this.validate = this.validate.bind(this)
    this.onSubmit = this.onSubmit.bind(this)
  }
  onChange(e, {name, value}){
     const state = this.state
     const { errors } = state
     if(errors[name]){ 
       delete errors[name] 
     }
     this.setState(Object.assign({},...state,{[name]: value, errors }))
     this.validate(name, value)
  }
  validate(name, value){
    {/*
       THIS SHOULD VALIDATE THE INPUT WITH THE APPROPRIATE NAME ATTRIBUTE
       AND UPDATE THE ERRORS ATTRIBUTE OF THE STATE
     */}
  }
  onSubmit(e){
     e.preventDefault()
     {/* CLEAR THE ERRORS OF THE STATE, SUBMIT FORM TO BACKEND, THENj RESET ERRORS IF ANY */} 
  }
  render() {
    <Form size='small' key='mycustomform'>

       <Form.Group>
         <Form.Field error={errors.input1} required>
           <label>Input1</label>
           <Input name='input1' onChange={this.onChange}/>
        {errors.input1 && <Label pointing color='red'>{errors.input1}</Label>}
        </Form.Field>
      </Form.Group>

      <Form.Group>
        <Form.Field error={errors.input2}>
          <label>Input2</label>
          <Input name='input2' onChange={this.onChange}/>
        {errors.input2 && <Label pointing color='red'>{errors.input2}</Label>}
       </Form.Field>
     </Form.Group>

     <Form.Field control={Button} onSubmit={this.onSubmit}/>
  </Form>
}

Detect the error message in the input field

Use the input event along with a regular expression, like so:

const input = document.getElementById("function_code");
const error = document.getElementById('error');
const regex = /[\\\/:*?"<>|]+/;

input.addEventListener('input', (e) => {
  const value = e.target.value;

  if (regex.test(value)) {
    input.value = value.slice(0, value.length - 1);
    error.textContent = 'A filename cannot contain any of the following characters: \/:*?"<>|';
  } else {
    error.textContent = '';
  }
});

input {
  padding: 8px 10px;
  border-radius: 5px;
  font-size: 1.2rem;
}

#error {
  display: block;
  color: red;
  margin: 5px 0 0 0;
}

<input type="text" id="function_code" name="function_code">
<span id="error"></span>

How do I trigger HTML5 validation error popup when custom validation message is set manually?

You can do so by using the .reportValidity().
Here is an example:

document.getElementById('testSubmit').addEventListener('click', (e) => {  e.preventDefault();  document.getElementById('test').setCustomValidity('THIS WILL ALWAYS BE AN ERROR, how do I display this message?');  document.getElementById('test').reportValidity();});

<input id = "test" type = "email" oninput="validateInput();" required><input id = "testSubmit" type = "submit">

How to add error popup for empty TextField input in Scenebuilder

addButton.setOnAction(new EventHandler<ActionEvent>() {
    @Override public void handle(ActionEvent e) {
        if ((input1.getText() != null && !input1.getText().isEmpty()) &&
            (input2.getText() != null && !input2.getText().isEmpty())){
            //ADD CODE TO ADD THE ITEM HERE!
        } else {
           Alert alert = new Alert(AlertType.INFORMATION);
           alert.setTitle("Input fields empty");
           alert.setContentText("Please fill all input fields");

           alert.showAndWait();
        }
    }
});  

PS : Here you can find different Alert Types depending on your needs.

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