Check if response to prompt is a certain String

Question

I would like to check if the user enters a string and verifying it whether the entered string is right or wrong.

Here I have done so far by using JavaScript by using prompt().

I am successful in displaying the prompt message and when I enter any name, it doesn't show anything. I am unable to get the required output.

function myFunction() {
  var myText = prompt("Hello World");
  var response;

  if (myText.search(charIn) > 0) {

    response = "Yes, that letter is in the string";

  } else {

    response = "No good, that letter is NOT in the string";
  }
  document.getElementById("demo").innerHTML = response;

}

<p>Click the button to demonstrate the prompt box.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

How is the code not working?

Luca Kiebel
– Luca Kiebel

2018-09-18 13:34:45 +00:00
Commented Sep 18, 2018 at 13:34 — Luca Kiebel
– Luca Kiebel, Commented Sep 18, 2018 at 13:34

Mamun · Accepted Answer · 2018-09-18 14:27:27Z

3

I believe you need to assign the prompt value to the variable charIn and Hello World to myText.

Also it is better to use includes().

Working Code Example:

function myFunction() {
  var myText = 'Hello World'
  var charIn = prompt();
  var response;

  if (myText.includes(charIn)){
    response = "Yes, that letter is in the string";
  }else{    
    response = "No good, that letter is NOT in the string";
  }
    document.getElementById("demo").innerHTML = response;
}  
   
myFunction();

<span id="demo"></span>

edited Sep 18, 2018 at 14:27

answered Sep 18, 2018 at 13:38

Mamun

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5 Comments

Vivek Budithi Over a year ago

When i am entering the string Hello World, It is showing me the error. Can you help me out with this.

Mamun Over a year ago

@EdgyAffairs, in that case condition should be if (myText.includes(charIn)){

Vivek Budithi Over a year ago

Thank you for your time

Mamun Over a year ago

@EdgyAffairs, glad to help. May I request you to accept the answer by clicking on the check mark beside the answer to toggle it from greyed out to filled in.........thanks

Vivek Budithi Over a year ago

Yeah I changed it now

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