Guidelines for showcasing validation summary on an ASP.NET webpage with the help of Javascript

My asp.net form contains multiple required fields that need validation.
I am looking to display a summary of all validations at the end of the form.
Valid input controls have already been checked, now I just need the summary.

Here is an example code snippet for validating user input data:

<script language="javascript" type="text/javascript">
        function userCheck(uName) {
            var uName = document.getElementById(uName);
            var letters = /^[A-Za-z0-9]+$/;
            if (uName.value.match(letters) && uName.value.length != 0) {
                uName.style.border = "2px solid #008A2E";
                return true;
            }
            else {
                uName.value = uName.value.replace(/[\W]/g, '');
                uName.style.border = "2px solid #ff0000";
                uName.focus();
                return false;
            }
        }
</script>

This function checks the validity of the username field, but there are more functions like this in my form.
Is there a way to display a summary of validations from all fields when the submit button is pressed?
The current solution provided below is not working.

 function ddlcheck(ddlclg) {
            var clg = document.getElementById(ddlclg.id);
            var clgname = document.getElementById('<%= LblCollegeName.ClientID %>');
            clgname.style.display = "block";
            clgname.innerHTML = "Selected College : " + clg.options[clg.selectedIndex].value;
            clg.style.border = "1px solid #008A2E";
            if (clg.options[clg.selectedIndex].value == "Select") {
                clgname.style.display = "none";
                clg.style.border = "1px solid #ff0000";
                validationhtml = validationhtml + "<b>*</b> College" + "</br>";
            }
        }

The above code snippet deals with dropdownlist validation.

 function select() {
            var count = 0;
            var chkSelectAll = document.getElementById('<%= ChkSelectAll.ClientID %>');
            var chkList = document.getElementById('<%= chk.ClientID %>').getElementsByTagName("input");
            for (var i = 0; i < chkList.length; i++) {
                if (chkList[i].checked == true) {
                    count++;
                }
            }
            if (count == chkList.length)
                chkSelectAll.checked = true;
            else {
                chkSelectAll.checked = false;
            }
        }

The above code handles validation for selected checkboxes.

Answer №1

insert a div (error report) in the validation summary section with custom styling

Next, add the following script:

<script language="javascript" type="text/javascript>
    var validationhtml="";
    function userCheck(uName) {
        var uName = document.getElementById(uName);
        var letters = /^[A-Za-z0-9]+$/;
        if (uName.value.match(letters) && uName.value.length != 0) {
            uName.style.border = "2px solid #008A2E";
            return true;
        } else {
            uName.value = uName.value.replace(/[\W]/g, '');
            uName.style.border = "2px solid #ff0000";
            uName.focus();
            validationhtml=validationhtml +"uname is not correct" ;
            return false;
        }
    }

    function validationsummary() {

        // if using jquery
        $(".errorreport").html(validationhtml); 

        //for javascript
        document.getelementbyid("errorreport").innerHTML = validationhtml; 

        if(validationhtml == "") {
            return true;
        } else {
            return false;
        }
    }
</script>

Lastly, make sure to trigger validationsummary() when the submit button is clicked

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