How do I cancel a form submission?

[ganeshbala]

I would like to cancel the form submission in case the "if" statement below is true. how can I acheive that?? I added "return false" inside the if statement but its not working. kindly do help me out..

function onSubmit() {

    //Type appropriate comment here, and begin script below

  var t = g_form.getValue('u_date');

  var a = new GlideAjax('testscript');

  a.addParam('sysparm_name','myfunction');

  a.addParam('sysusername', 'bala');

  a.getXML(myback);

  function myback(res)

  {

  var answer= res.responseXML.documentElement.getAttribute("answer");

  if(t!=answer)

  {

  alert("current date is" + answer);

  }

}

}

[oharel]

In short (continue alikuttyka 's answer):

function onSubmit() {
   //Type appropriate comment here, and begin script below
   var t = g_form.getValue('u_date');
if(your condition) {
alert('some alert');
return false;
}
}

harel

[amlanpal]

Hi Bala,

In such cases you can use synchronous GlideAJAX and use getXMLWait() instead of getXML(). Please find the link Examples of synchronous GlideAjax . In this case if you are using getXMLWait(), you do not have to use callback function. Please find the code below:

function onSubmit() {

    //Type appropriate comment here, and begin script below

  var t = g_form.getValue('u_date');

  var a = new GlideAjax('testscript');

  a.addParam('sysparm_name','myfunction');

  a.addParam('sysusername', 'bala');

  a.getXMLWait();

  var answer= a.getAnswer();

  if(t!=answer)

  {

  alert("current date is" + answer);

  }  

}

I hope this helps.Please mark correct/helpful based on impact

[oharel]

Just a note to consider:

ServiceNow does not recommend using asynchronous getXMLWait();

In the link above, it is stated so:

If your use case demands that no further processing can occur until the GlideAjax response has been received, you can use getXMLWait(). However, because this will slow down your code and lock the user session until the response is received, it is generally recommended that you use getXML() with a callback function.

[Prasad43]

Hi,

You need to use synchronous glide ajax here.

https://docs.servicenow.com/bundle/rome-application-development/page/script/ajax/topic/p_AJAX.html

var ga = new GlideAjax('HelloWorld') ;
ga.addParam('sysparm_name','helloWorld');
ga.addParam('sysparm_user_name',"Bob");
ga.getXMLWait(); 
alert(ga.getAnswer());

var HelloWorld = Class.create();
HelloWorld.prototype = Object.extendsObject(AbstractAjaxProcessor, {
helloWorld: function() 
 { return "The Server Says Hello " + this.getParameter('sysparm_user_name') + "!"; } } );