Hi,

On the click event of submit button you are calling the “checkvalidity” function and passing the argument.

But in your JavaScript “checkvalidity” function definition is different (function without parameter. If you want to call the “checkvalidity” function remove {!$Component.orgName}

Try the below code snippet as reference:

<apex:pageBlockSection title="Nonprofit Organization"
columns="2" id="pbset3">
<apex:pageBlockSectionItem >
<Label>Organization's Name</Label>
<apex:inputfield styleclass="textboxred" id="orgName"
onkeyup="textLimit('{!$Component.OrgName}',80);"
style="width:200px;" value="{!Actinterest.Name}" />
</apex:pageBlockSectionItem>

</apex:pageBlockSection>

 <apex:commandButton styleclass="submit" value="Submit" onclick="return checkvalidity();"

 action="{!save}" />

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hi ,

i removed parameters and i mentioned .onclick="return checkvalidity();" even though it is not working , and i tryied by providing the ids of page,form,and pageblock   in javascript as

if(document.getElementById("{!$Component.page1.form1.pb1.orgName}").value == '')
{
alert('please enter organization name');
return false;
}