Dynamic Javascript Validation Message Panel

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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

Technical Lead

India

Member

He is presently working as tech arch in one of the leading IT company.He has total 9 years of experience in C#.net. He is a B.E graduate in Computers from Bombay University.

Most of his experiences are in designing architect for end to end solutions. His interest areas are WCF,Spring.net,Architecture- Model View Presenter,UML,Webservice,Performance Engineering/tuning,Design patterns,Generics,Enterprise Library,Regular expressions,Silverlight and WWF.

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My vote of 1

Dhanoop7

19:14 29 Mar '12

Use Existing Controls

nickyt

7:27 9 Jul '08

Improvements to Your JavaScript

nickyt

3:50 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);
    }