How to best compare three strings

ultragc

Hi all. I am starting on javascript and need some help. Basically, I have a form in which I need to compare three text fields (string1, string2, and string3). The user must enter the exact text on all three strings before they are allow to submit it.

In short, the user must type in their initials in three fields to acknowledge that the are agreeing to the terms. Before submitting, the fields must be validated for exact match.

Any suggestions would be appreciated.

Thanks.
Ultra

ultragc

Does anyone have any suggestions?

Thanks

gits

hi ... you have to get the values out of your textboxes and simply compare them ... you may compare them like this:

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var value1 = 'inputvalue1';

var value2 = 'inputvalue2';

var value3 = 'inputvalue3';
 
// if value1 matches value2 and value1 matches value3 then value2 must

// match value3 ... so we needn't to compare them explicitly
 
if (value1 == value2 && value1 == value3) {

    // all 3 values match

} else {

    // one of the values doesn't match

}

note ... think you should check before this whether the value1 == '' or not ... in that case the user didn't enter a value and it seems that you want him to do so ...

may be you want to check for some length of the input or characters too ... do that before comparing the values 1-3 ... you always only need to check value1 for that ... last step compares value2 and value3 to the validated value1 only ...

hope this helps ...

ultragc

Gits... thanks for the hint. I'll give that a try.

gits

Quote:

Originally Posted by ultragc

Gits... thanks for the hint. I'll give that a try.

... please show your solution at least ... or if you encounter problems post the questions :) ... it should work with such a compare-function ... but somtimes there are better ways to do such things ... the shown is a simple one have a look at the following too:

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// you may fill a js-object 'onchange' of your textboxes
 
var inputs = {

};
 
// this function fills the objects data - call it onchange with param 'this'

// that passes the elements-ref itself to the function
 
function fill_inputs_object(obj) {

    inputs[obj.id] = obj.value;    

}
 
// check the form before submitting it
 
function check_form() {

    var val = true;

    var value1 = null;
 
    for (var i in inputs) {

        var inp = inputs[i];
 
        // check for emptyness of first value

        if (inp == '') {

            // you may produce a error-message here

            val = false;

            // val is false, so we break the loop

            break;

        } else {

            // value is not empty and we remember it for comparing it with

            // the others

            if (value1 == null) {

                value1 = inp;

            } else {

                // we compare the inp with value1

                if (value1 != inp) {

                    // you may produce a error-message here

                    val = false;

                    break;

                }

            }

        }

    }
 
    return val;

}

thats an idea too ... we should beautify that solution ... :) until it looks a little bit ugly with much of those indentations ...

kind regards

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