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Introduction

During development we come across lots of client side validations and we normally use .Net validator controls.These controls give us the feature to display the client-side validation messages in 'Summary' like panel. In some places we need clean javascript validation that has to be used to serve our purpose.In such cases we want to display these messages not as alert message but to be displayed as inline form messages.

Background

Below is the javascript code that creates dynamic message panel.

function HideServerValidationPanel(panelID)
    {    
        if (document.getElementById(panelID) != null)
        {
            document.getElementById(panelID).style.display = "none";
        }        
    }
    function DisplayErrors(errorMessages)
    {        
        if (errorMessages != null && errorMessages.length > 0)
        {
             LoadValidationErrorPanel(errorMessages); 
             
             return false; 
        }
        else
        {
            return true;
        }
       
    }
    function LoadValidationErrorPanel(arrMessage)
    {
        
        var myMain =  document.getElementById ("MainErrorTag");
        if (myMain.firstChild != null)
        {
            myMain.removeChild(myMain.firstChild);
        }        
        var myDiv = document.createElement("div");
        var myUL = document.createElement("ul");
        var myPara =  document.createElement("p");
        var myImg = document.createElement("img");
        var myDesc = document.createElement("strong");
        
        myDiv.className = "ofWrapper";
        //myImg.className = "xxx";
        //myDesc.className ="yyy"

        myImg.setAttribute ("src","Cross.JPG");        
        myDesc.innerText = "Please correct the following details before proceeding ..." ;
       
        myPara.appendChild(myImg);
        
        myPara.appendChild(myDesc);
        myDiv.appendChild(myPara);
        var myLi;
        for(var j= 0; j < arrMessage.length;j++)
        {
            myLi = document.createElement("li");
            myLi.innerText = arrMessage[j];
           // myLi.className = "abc";
            myUL.appendChild(myLi);
        }
        myDiv.appendChild(myUL);
        myMain.appendChild(myDiv);
    }
    function SetFocus(ControlField, isFocusSet)
    {
        if (isFocusSet == false)
        {
            controlField.focus();
            return true;
        }
        else
            return false;
    }
    
    function ValidateMyScreen()
    {
        var Errors = new Array();
        var ErrorCounter = 0;
      
        if (document.getElementById('<%=TextBox1.ClientID%>').value == '')
        {
            Errors[ErrorCounter++] = "Data1 is required.";   
        }
          
        if (document.getElementById('<%=TextBox2.ClientID%>').value== '')
        {
            Errors[ErrorCounter++] = "Data2 is required.";   
        }    
              
    HideServerValidationPanel('<%=pnlMessage.ClientID%>');
    return DisplayErrors(Errors);
    }

Here is the html code where we have placed server side error message panel and client side DIV tag to display our messages. The dynamic javascript panel created at run time is appended to div tag ID ="MainErrorTag".

<asp:Panel runat="server" ID="pnlMessage">            
            <asp:Label ForeColor="Red" runat="server" ID="lblServerError"></asp:Label >            
        </asp:Panel>            
        <div id="MainErrorTag">            
        <div>

Conclusion

The above code is easy to use. One can create a style sheet to design message panel and create one common javascript file to use it across web pages.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

santosh poojari

He is a Team Lead currently working with a software company in India.He has overall 5.5 years of experience in .net technology. He is a B.E in computers from Mumbai University. His area of Interest is Microsoft Technology : Asp.Net,C#,Web services,SSIS,SSRS,Windows Workflow Foundation 3.0,State Machine Compiler,Regular Expression, Enterprise Library3.0,Spring.net,Design Patterns and Architecture Design.
He is MCPD-EA Certified.

He loves playing Cricket,Driving,Music and Drawing Sketches.

Occupation:	Team Leader
Location:	India

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Msgs 1 to 6 of 6 (Total in Forum: 6) (Refresh)

FirstPrevNext

Use Existing Controls

nickyt

8:27 9 Jul '08

Improvements to Your JavaScript

nickyt

4:50 7 Jul '08

Santosh,

Here's some improvements for your JavaScript. There's more that can be improved, but here's some suggestions.

Later,
Nick Smile

    function HideServerValidationPanel(panelID)
    {    
        var panel = document.getElementById(panelID); // or use $get if using ASP.NET AJAX
        
        if (panel)
            panel.style.display = "none";     
    }
    
    function DisplayErrors(errorMessages)
    {        
        //if (errorMessages != null && errorMessages.length > 0)
        // Checking the length > than zero is not necessary. 0 is interpreted as false
        // Checking errorMessages is null is redundant. An undefined object == false.
        var showErrors = errorMessages && errorMessages.length;
        if (showErrors)
             LoadValidationErrorPanel(errorMessages); 
             
        return !showErrors;       
    }
    
    function LoadValidationErrorPanel(arrMessage)
    {
        
        var myMain =  document.getElementById ("MainErrorTag");
        
        //if (myMain.firstChild != null) null check is redundant. An undefined object == false.
        if (myMain.firstChild)
            myMain.removeChild(myMain.firstChild);
    
        var myDiv = document.createElement("div");
        var myUL = document.createElement("ul");
        var myPara =  document.createElement("p");
        var myImg = document.createElement("img");
        var myDesc = document.createElement("strong");
        
        myDiv.className = "ofWrapper";

        myImg.setAttribute("src","Cross.JPG");        
        myDesc.innerText = "Please correct the following details before proceeding ..." ;
       
        myPara.appendChild(myImg);
        
        myPara.appendChild(myDesc);
        myDiv.appendChild(myPara);        
        var myLi;
        
        for(var j= 0; j < arrMessage.length;j++)
        {
            myLi = document.createElement("li");
            myLi.innerText = arrMessage[j];
            myUL.appendChild(myLi);
        }
        
        myDiv.appendChild(myUL);
        myMain.appendChild(myDiv);
    }
    
    function SetFocus(ControlField, isFocusSet)
    {
        //if (isFocusSet == false) == false is not required. Just do !isFocusSet
        if (!isFocusSet)
            controlField.focus();

        return !isFocusSet;
    }
    
    function ValidateMyScreen()
    {
        var Errors = new Array();
        var ErrorCounter = 0;
      
        if (document.getElementById('<%=TextBox1.ClientID%>').value == '')
        {
            Errors[ErrorCounter++] = "Data1 is required.";   
        }
          
        if (document.getElementById('<%=TextBox2.ClientID%>').value== '')
        {
            Errors[ErrorCounter++] = "Data2 is required.";   
        }    
              
    HideServerValidationPanel('<%=pnlMessage.ClientID%>');
    return DisplayErrors(Errors);
    }

Nick Taylor
http://www.rugbyincanada.com/webmaster

Re: Improvements to Your JavaScript

21:14 27 Jul '08

3:05 27 Jun '08

18:58 29 Jun '08

0:31 27 Jun '08

Last Visit: Wednesday, December 3, 2008 8:43 PM Last Update:Wednesday, December 3, 2008 8:43 PM

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