How do i ensure that my textarea value should always contain the word "india" in javascript?

How do i ensure that my textarea value should开发者_开发知识库 always contain the word "india" in javascript?

Actually i want to validate the textarea so that the user should always the word "india" in that.

Please help me. Thanks in advance.

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You can use the blur event which is invoked when the user removes focus from the textarea.

<textarea onblur="return validate(this);"></textarea>

var reg = /\bindia\b/im;
function validate(textArea) {
    // case-insensitive search for "india"
    if (!reg.test(textArea.value)) {
        alert("Where's India?");
    }
}

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<textarea onchange='if(this.value.indexOf("india") == -1) this.value = "";'></textarea>