client script to validate characer lenght and allow no special characters.

[RudhraKAM]

I have a requirement in which I need to check the length, uniquness and special characters of the variable

1.Length should be max 5 and min 3 

2.No special characters should be allowed

3.and it should check if the prefix already exist or no

(can i write all 3 conditions in 1 on change script ?Because when i give @@@ in the field it is showing the 1st alert (as expected and  also 2nd alert message too.

below is the on change client script i am using 

can some one help me with this 

function onChange(control, oldValue, newValue, isLoading) {
	if (isLoading || newValue == '') {
		return;
	}
	var regex = new RegExp("^[a-zA-Z0-9]*$");   //no special characters
	
	
	if(!regex.test(newValue)){
		
		
		alert('Please enter only letters');
		
		
		g_form.setValue('csv_prefix','');
	}
	
	// calculate length 
	var str = g_form.getValue('csv_prefix');
	var len = str.length;
	if(len> 5 || len< 3)
		{
		g_form.setValue('csv_prefix','');
		alert('Please enter atleast 3 and maximum of 5');
	}
	
}

This is the client script which i copied from community which is not working either 

If abc  name is present in the tables it should alert and clear off the message 

function onChange(control, oldValue, newValue, isLoading) {
	if (!isLoading && newValue !='')
	{
		var gr = new GlideRecord('u_delegated_management_environment');                                 // read from Configuration Item table
		var uname = g_form.getValue('csv_prefix');
		gr.addQuery('name', uname);                                                   // prepare query
		gr.query(function(rec){
			if (rec.next()) {                                                               
				alert('Name ' + uname + ' already exists. Assign an other but unique name, please.');
				g_form.setValue('csv_prefix','');                               // then delete name input field
			} else {
				if (uname != g_form.getValue('csv_prefix')) {       
					g_form.setValue('csv_prefix',uname);                 
				}
				alert('Name ' + uname + 'does not exist. Accepted');
			}
		});
	}
}

[ggg]

I believe this is what you are looking for:

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading || newValue == '') {
        return;
    }
    //var regex = new RegExp("^[a-zA-Z0-9]*$");   //no special characters
    var regex = new RegExp("[a-zA-Z0-9]");
    
    var str = g_form.getValue('u_title');
    var len = str.length;
    if(len  < 6 && len > 2){
        alert('1');
        if(regex.test(newValue)){
            alert('2');
        }
        else {
            alert('Please enter only letters or numbers');
            g_form.setValue('u_title','');
        }
    }
    else {
        g_form.setValue('u_title','');
        alert('Please 3 - 5 characters.');
    }
}

[RudhraKAM]

can we include unique name script in this one too ?

[ggg]

I do not understand your question ... unique name script??

[ggg]

1) put the unique name validation in its own on change client script

2) i have never used the construct you have in your name validation script and when i test it i get the same wrong result as you do.

    I would use an ajax script to determine if the value is unique.