[SalesForce] Javascript alert on page load based on the value of controller variable

I am getting the value of booleanvariable in controller as below. I want to display an alert on visual force page when boolean variable is true.I see the value of Booleanvariable is true in the url,but alert is not triggering.

public with sharing class TestBoolean {

boolean pbv;

public TestBoolean(){    

     try{     pbv = boolean.valueOf(system.CurrentPageReference().GetParameters().get('BooleanVariableName'));
  }catch(Exception e){ 
  pbv = false;
 }

}

If I just run alert without If condition and no parameter, its displaying alert.
Any help is appreciated.

Java script for alert on visual force page

window.onload = showAlert(!pbv);
function showAlert(!pbv) 
{
  if(!pbv) {
    alert('Hi I am the alert you have been waiting for');
  }
}

Best Answer

All you need to do is this for the JS (Global merge variables)

window.onload = showAlert();
function showAlert() 
{
  if('{!$CurrentPage.parameters.BooleanVariableName}' == 'true') {
    alert('Hi I am the alert you have been waiting for');
  }
}

Additionally (Not needed for above) if you want to use the PBV on the page you need to assign getters and setters

public Boolean PBV {get; set;}

then use merge fields on the page:

{!PBV}

Also, you should use the first example in my answer to your previous question. The try catch in not applicable in your case

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[SalesForce] How to use Javascript to validate required field entry on a VF page

There are some issues with your validation construct. First the action attribute of the apex:actionSupport is not for the javascrict functions but for controller methods. Then don't forget to use braces if calling an apex method from the visualforce page action = "{!SSave}".

Use merge-field syntax to reference the method. For example, action="{!incrementCounter}" references the incrementCounter() method in the controller. If an action is not specified, the page simply refreshes.

Then i would do a validation after user submits the form (click on "Submit" button). We will invoke a validation javascript function and need to insert a return false; otherwise the page will be reloaded. In this examle i will not use a commandLink because i will not call any apex method from it. This work will take an actionFunction after validation is finished.

<apex:actionFunction name="saveNow" action="{!SSave}"/>

<apex:inputField value="{!selectValue}" id="myField"/>

<input type="button" value="Submit" class="btn" onclick="doValidation();">

<script>
function doValidation(){
    if(document.getElementById('{!$Component.myField}').value != ''){
        saveNow();
    }
    else{
        alert('Please fill out all fields!');
    }
}
</script>

[SalesForce] How to pass a variable’s value of child visualforce page to a variable in parent visualforce using js

You can use either Window.postMessage to safely transfer data between the popup and the original window; this is the preferred method. Alternatively, you can also set an Apex Cookie that can be shared between the two windows. Using expando properties of window.opener should not be used, because you can't even verify that the receiving page is even the original page which opened the popup; this might cause undesirable behavior.

Best Answer

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[SalesForce] How to pass a variable’s value of child visualforce page to a variable in parent visualforce using js

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