Javascript validation onblur

Question

I have written same javascript twice for two textboxes but it runs both the scripts for one text box i need to write once and call the same for more text boxes

    function checkalphabets() {
    var pattern = /^[a-zA-Z\s]+$/;
    if (!pattern.test(myTextBox.value)) {
        modal({
            type: 'warning',
            title: 'Warning',
            text: 'Only Alphabets allowed!',
            center: false,
             callback: function(){ $("#myTextBox").focus();}
        });

        exit;
        return false;
    }
    return true;

}
function checkalphabets1() {
    var pattern = /^[a-zA-Z\s]+$/;
    if (!pattern.test(TextBox1.value)) {
        modal({
            type: 'warning',
            title: 'Warning',
            text: 'Only Alphabets allowed!',
            center: false,
             callback: function(){ $("#TextBox1").focus();}
        });

        exit;
        return false;
    }
    return true;

}
 $('.modal-btn').click(function() {

        $('#modal-window').hide();

    });

here is the fiddle

Answer 1

You can pass the element to be checked as a parameter of the function:

function checkalphabets($el) {
    var pattern = /^[a-zA-Z\s]+$/;
    if (!pattern.test($el.val())) {
        modal({
            type: 'warning',
            title: 'Warning',
            text: 'Only Alphabets allowed!',
            center: false,
             callback: function(){ $el.focus();}
        });

        return false;
    }
    return true;
}

The elements is passed when called and the check is done on the element.

checkalphabets($("#TextBox1"));

Answer 2

in your code textbox1 and mytextbox are undefined. Pass elements to the function to make them defined:

function checkalphabets(myinput) {
    var pattern = /^[a-zA-Z\s]+$/;
    if (!pattern.test(myinput.value)) {
        modal({
            type: 'warning',
            title: 'Warning',
            text: 'Only Alphabets allowed!',
            center: false,
             callback: function(){ $(myinput).focus();}
        });

        exit;
        return false;
    }
    return true;
}

 $('.modal-btn').click(function() {

        $('#modal-window').hide();

    });

also I suggest onkeyup instead of onblur to make check after each character:

<input name="myTextBox" type="text" id="myTextBox" onkeyup="checkalphabets(this)" />
<input name="TextBox1" type="text" id="TextBox1" onkeyup="checkalphabets(this)" />

Aslo it would be good idea to subtract disallowed characters after warning.

Answer 3

Can you think of passing the this value as input to the function in Javascript & extract the value from this variable as explained below?

HTML:

<form method="post" action="test.aspx" id="form1">
<div class="aspNetHidden">
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJODIwMTY2MjU3ZGQVs14nJwqB/iIms8CsXW3SCzs22w==" />
</div>

<div class="aspNetHidden">

    <input type="hidden" name="__VIEWSTATEGENERATOR" id="__VIEWSTATEGENERATOR" value="75BBA7D6" />
</div>
    <div>
        <input name="myTextBox" type="text" id="myTextBox" onblur="checkalphabets(this)" />
        <input name="TextBox1" type="text" id="TextBox1" onblur="checkalphabets(this)" />   
    </div>
    </form>

Javascript:

function checkalphabets(thisValue) {
    var pattern = /^[a-zA-Z\s]+$/;
    if (!pattern.test(thisValue.value)) {
        modal({
            type: 'warning',
            title: 'Warning',
            text: 'Only Alphabets allowed t1 & t2!',
            center: false,
             callback: function(){ $(thisValue).focus();}
        });

        exit;
        return false;
    }
    return true;
}
 $('.modal-btn').click(function() {
        $('#modal-window').hide();
    });

Like wise you can use the same method of any number of text boxes!