Validating textbox prompts

There is a report with a textbox prompt. Users are expected to enter a phone number in (nnn)nnn-nnnn format in that prompt.

In this recipe, we will write a code to validate the value entered by the user and submit the report only if the value entered is in specified format.

Getting ready

Pick any report and add a textbox prompt to it. We will add a JavaScript to validate that textbox.

How to do it...

1. Wrap the textbox prompt within a SPAN in the same way as we did in prior recipes.

2. Add the following script to the page footer:

   <script>
   function ValidatePage()
   {
   var theSpan = document.getElementById("A1");
   var a = theSpan.getElementsByTagName("input"); /* this captures the textbox */
   for( var i = a.length-1; i >= 0; i-- )
   {
   var link = a[i];
   if( link.id.match(/PRMT_TB_/))
             {phoneRegex = /^\(\d{3}\) \d{3}-\d{4}$/; /* This is regular expression to allow only the strings in (nnn) nnn-nnnn format */
               if( !link.value.match( phoneRegex ) ) {
         ...