CODEWITHSUNDEEP
javascriptjquery
X10nD
X10nD

Reputation: 22030

Check whether a word is in a text box regardless of case

I am trying to figure out whether a text box has a given word, regardless of case. For example, how can I determine whether a given text box, #TextBox, has the word "hello" in it?

var specialwords = ['hello','Hello','HELLO']; //special words here

$('#TextBox').keydown(function() {
    var text = $(this).val();
    text = text.split(" ");
    var newtext = "";
    for(var i = 0; i < text.length; i++){
        // code to check words
    }
    $("#check").html(newtext);
});

Upvotes: 1

Views: 146

Answers (4)

Ben
Ben

Reputation: 9895

You can make a case insensitive regex with all the words like this:

RegExp("\\b(?:" + specialwords.join("|") + ")\\b", "i")

then you can use it against each word. I am not sure what you are doing with the words once you identify them ... I will assume for the purpose of my code snippet that you are ignoring them from the text.

var specialwords = ['hello','world','pizza']; //special words here
var swr = RegExp("\\b(?:" + specialwords.join("|") + ")\\b", "i")

$('#TextBox').keydown(function() {
    var text = $(this).val();
    text = text.split(" ");
    var newtext = [];
    for(var i=0; i<text.length; i++){
        if (!text.match(swr)) {
            newtext.push(text)
        }
    }
    $("#check").html(newtext.join(" "));
});

Using the \b as a word delimiter in regexp you can also check the whole text without breaking up the words if you want.

var specialwords = ['hello','world','pizza']; //special words here
var swr = RegExp("\\b(?:" + specialwords.join("|") + ")\\b", "i")

$('#TextBox').keydown(function() {
    var text = $(this).val();
    var newtext = text.replace(swr, "");
    $("#check").html(newtext);
});

Upvotes: 1

royhowie
royhowie

Reputation: 11171

The easiest way to check whether a text box has a given word, irrespective of case, is to convert the text box to lowercase, then split by spaces and find the indexOf the word.

var word = "hello".toLowerCase();    // make sure this word is lowercase

$("#TextBox").keydown(function () {
    var text = $(this).val().toLowerCase().split(" ");
    if (text.indexOf(word) > -1) {
        // do something
    } else {
        // word is not in the text box
    }
})

If you want to check for an array of words, specialWords, wrap the if block in a for loop. This would be O(n²) complexity, but that should be fine, as long as your input isn't extremely long1.

1we're talking thousands upon thousands of words long for it to matter.

Upvotes: 2

Anik Islam Abhi
Anik Islam Abhi

Reputation: 25352

TRY this

$(document).ready(function(){

    
  
  var specialwords = ['hello','Hello','HELLO'];//special words here

            $('#TextBox').keydown(function() {
             //alert(this);
                var text = $(this).val().trim();
              console.log(text);
              //  text = text.trim().split(" ");
                var newtext = "";
                var up=0,low=0;
                for(var i=0;i<text.length;i++){
                  if(text[i]==" ")
                    continue;
                  else{
                  if(text[i].trim()==text[i].trim().toLowerCase())
                    low++;
                   if(text[i].trim()==text[i].trim().toUpperCase())
                    up++;
                    }
                }
              if(up>0 && low>0)
                newtext="mix case";
              else if(up>0)
                newtext="Upper case"; 
              else if(low>0)
                newtext="Lower case"

                $("#check").html(newtext);
            });
  
  });       
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<input type="text" id="TextBox">
<div id="check"></div>

Upvotes: 1

Dimag Kharab
Dimag Kharab

Reputation: 4519

function checkAlphaCase(alpha) {
  if (alpha == alpha.toLowerCase()) {
    alert('LowerCase');
  } else if (alpha == alpha.toUpperCase()) {
    alert('UppperCase');
  } else {
    alert('MixedCase');

  }

}


checkAlphaCase('ANIR');

Upvotes: 1

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