I want to do something like the following in a visualforce page

<apex:inputTextarea id="abc" 

Can anyone tell me how to achieve this

I want to display an alert if the entered value is null. else I want to pass it to the controller.

  • why don't you just check the AModel.Comment.Body this is null or not in your controller and show error message. else when you try to submit/save the page. before calling the controller method, call a javascript function there check this field is empty or not. and based on that show alert message – Ratan Paul Jun 16 '16 at 12:06
  • That is not possible actually... The error message has to come in an alert box. – Rimii Jun 16 '16 at 12:12
  • what is not possible? the controller validation or javascript alert message? – Ratan Paul Jun 16 '16 at 12:13
  • It has to be a javascript alert message. It cant be a controller validation. – Rimii Jun 16 '16 at 12:14
  • 1
    Use the Ratan's code of Javascript in a Function and Call that function from the Onclick of Command Button... – Subhash Jun 16 '16 at 12:28

You can add a javascript validation like below

<apex:inputTextarea id="abc" 
        value="{!AModel.Comment.Body}" />

in javascript

var commentBodyVal = document.getElementById('{!$Component.abc}').value;
if(commentBodyVal.trim().length == 0 )
    alert('Your text area field is empty. Please add something.');
else {
   //call action function to call your controller method
| improve this answer | |
  • document.getElementById('{!$Component.abc}').value statement is throwing an error.. it it saying cannot read the .value property of null @Ratan – Rimii Jun 20 '16 at 12:11
  • @Rimii may be your component is inside multiple VF tags that s why it is not able to access .. check this doc developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/… – Ratan Paul Jun 20 '16 at 12:15
  • @Rimii your id may be like this {!$Component.theBlock.theSection.theSectionItem.theText} multi component ids – Ratan Paul Jun 20 '16 at 12:21
  • @Rimii is tis question still open ? – Ratan Paul Jun 29 '16 at 6:46
  • no the question is not open – Rimii Jun 29 '16 at 7:57

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