Question

JavaScript When the button is pressed, the application should prompt the user to enter a string...

JavaScript
When the button is pressed, the application should prompt the user to enter a string or ‘***’ to quit, and then remove all instances of the following substring “erd” in the input string. Assume no spaces in the string. Make the entire string lowercase to start with.
It should show the parsed string (with the words already removed) in the text area.
The application should then again do the above, clearing out the text area before each iteration of your loop, until the user enters ‘***’. It should then alert
‘Thanks for using the text parser’ and exit.   
Engineering   Computer-Science   
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Homework Answers

Answer #1

In the following program, the page reloads after entering '***' and alerting the user. You can do anything like redirecting to another page instead of reloading the page.

HTML code + Javascript:

<html>
    <head>
        <title>
            Text Parser
        </title>
        <style>
            h2{
                margin-top: 100px;
                text-align: center;
            }
            .play_area{
                padding:30px;
                text-align: center;
            }
            .my_btn{
                width:100px;
                text-align: center;
                margin: auto;
                margin-top:30px;
                padding:10px;
                background-color: rgb(0, 92, 128);
                cursor: pointer;
                color:white;
                font-weight: bold;
            }
            .my_btn:hover{
                background-color: rgb(9, 117, 180);
            }

            #showstring{
                padding:10px;
            }
            .info, .result{
                text-align: left;
                padding:10px;
                background-color: rgb(224, 221, 221);
                width:49%;
                margin:auto;
            }
        </style>
    </head>
    <body>
       <h2>Text Parser</h2> 
       <div class="play_area">
           <div class="result">Result</div>
           <textarea name="showtext" id="showstring" cols="100" rows="5"></textarea>
           <div class="info">Click the button to enter the string</div>
           <div class="my_btn" onclick="takeInput()">Click</div>
       </div>
       <script>


           //function to prompt user for input string
           function takeInput(){

                //clearing the textarea
                document.querySelector("#showstring").value = "";
                var input = prompt("Enter a string or '***' to quit");

                //if input is '***'
                if(input === '***'){
                    alert("Thanks for using the text parser");

                    //just reloading the page
                    //you can redirect to any page after exitting
                    location.reload();
                }
                else{

                    //convert string to lowercase
                    input = input.toLowerCase();

                    //removing all instances of 'erd'
                    var result = input.replaceAll("erd", "");

                    //showing the modified string in textarea
                    document.querySelector("#showstring").value = result;
                }
           }
       </script>
    </body>
</html>

Output:

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