Question

I’m creating form validation, but can’t figure out how to use checking preg_match from variable. Checking just for empty fields working fine, but its not enough. Any advice?

var tekst = /([a-zA-Z0-9]|[a-zA-Z0-9])/;    
var myForm = document.forms.formaa;
var prek = myForm.elements['preke'];
var kaina = myForm.elements['kaina'];
var k = myForm.elements['kiekis'];
var uzsak = myForm.elements['uzsakymas'];
if (uzsak.value == ''){
    alert("neuzpildyta");
    return false;
}
for (var i = 0; i < prek.length; i++) {
    var preke = prek[i];
    var kai = kaina[i];
    var kie = k[i];
    if (preke.value == '' || (preke.value).test(tekst) == false){
        alert("neuzpildyta");
        return false;
    }
    if (kai.value == ''){
        alert("neuzpildyta");
        return false;
    }
    if (kie.value == ''){
        alert("neuzpildyta");
        return false;
    }
}

Answer 1

You can also use like this,

if (x==null || x==””) {
document.getElementById(‘name’).innerHTML=”Name must be filled out”;
return false; }

For More This one help’s you JavaScript Validation.