how to load 2 functions in javascript at window.onload

Question

I am just picking up on javascript and I need to load 2 functions that I want to use when the window loads.

One function captures the form name and UTM parameters while the other generates a unique number. All these on window.onload in javascript for an HTML page.

My script below.

<script type="text/javascript">
var defaultHiddenFieldNameValue = "";
function getQueryStringParamValue(strQStrParam) {
var strURL = document.location.href;
var strQStrParamValue = "";
 if (strURL.indexOf('?') != -1)
 {
 strQStrParamValue = strURL.substr(strURL.indexOf('?') + 1);
 if (strQStrParamValue.indexOf(strQStrParam) != -1)
 {
 strQStrParamValue = strQStrParamValue.substr(strQStrParamValue.indexOf(strQStrParam));
 strQStrParamValue = strQStrParamValue.substr(strQStrParamValue.indexOf('=') + 1);
 if (strQStrParamValue.indexOf('&') != -1)
 strQStrParamValue = strQStrParamValue.substr(0, strQStrParamValue.indexOf('&'));
 return strQStrParamValue;
 }else{
 strQStrParamValue = defaultHiddenFieldNameValue;
 return strQStrParamValue;
 }
 }else{
 strQStrParamValue = defaultHiddenFieldNameValue;
 return strQStrParamValue;
 }
}
// Form name goes here
var form = "formname";
function setCampaign(){
 var elqForm = document.forms[form];
 //repeat for each field to populate
 document.forms["formname"]["val1"].value = getQueryStringParamValue('utm_source');
 document.forms["formname"]["val2"].value = getQueryStringParamValue('utm_medium'); 
 document.forms["formname"]["val3"].value = getQueryStringParamValue('utm_campaign');
}
function VisitorID() {
 var min = 1;
 var max = 9999999999;
 var num = Math.floor(Math.random() * (max - min + 1)) + min;
 var timeNow = new Date().getTime();
 document.getElementById('field16').value = num + '_' + timeNow;
}
function both() {
 function VisitorID();
 function setCampaign();
}
window.onload = both;
</script>

• Jonas Wilms: Remove the two function syntax errors and itll work fine..

Answer 1

function both() {
 function VisitorID();//syntax error
 function setCampaign();
}

The function keyword just goes before function declarations. If you want to call them you dont need them (they throw an error):

function both() {
 VisitorID();
 setCampaign();
}

• Arun: Thanks Jonas, works amazing !! Appreciate your quick response.
• Bálint: @Arun if the answer helped you, then click the green tick below the voting buttons

Answer 2

You can not call functions with prefix function in it. That will declare the function. Change last few lines from this -

function both() {
 function VisitorID();
 function setCampaign();
}
window.onload = both;

to this -

function both() {
 VisitorID();
 setCampaign();
}
window.onload = both();

if you want both functions to get executed.