Question

I have am HTML form in a PHP page. The form has various inputs. One of the inputs has an onchange event:

<input size=10  type=number id=sku1 name=sku1 onchange="showUser(1, this.value);showWhse(1, this.value)">

This calls the following function:

<script type="text/javascript">  
  function showUser(userNumber, str)  
  {  
    if (str=="")  
    {  
      document.getElementById("txtHint" + userNumber).innerHTML="";  
      return;  
    }    
    if (window.XMLHttpRequest)  
    {// code for IE7+, Firefox, Chrome, Opera, Safari  
      xmlhttp=new XMLHttpRequest();  
    }  

    xmlhttp.onreadystatechange=function()  
    {  
      if (xmlhttp.readyState==4 && xmlhttp.status==200)  
      {  
        //document.getElementById("txtHint" + userNumber).innerHTML=xmlhttp.responseText; 
        var responseText = xmlhttp.responseText;  
        var description = responseText.substring(12, responseText.indexOf(",Warehouse:"));  
        var warehouse = responseText.substring(responseText.indexOf(",Warehouse:")+11, responseText.indexOf(",SellingUnits:"));  
        var sellingUnits = responseText.substring(responseText.indexOf(",SellingUnits:")+14);  

        document.getElementById("whse" + userNumber).innerHTML = warehouse;  
    document.getElementById("txtHint" + userNumber).innerHTML = description;  
    document.getElementById("su" + userNumber).innerHTML = sellingUnits;  
  }  
}  
xmlhttp.open("GET","getdata1.php?q="+str,true);  
xmlhttp.send(); 
} 
</script>

This works 100%. if however, the input is populated by a session variable, and the page is refreshed, how can I get the script to execute again onload, without an onchange event?

so when the page is first visited, id the input has a value, execute the script?

Answer 1

Just execute the function onload?

window.onload = function init() {
    showUser(1, document.getElementById("sku1").value);
}

You may also use the onload attribute of your document’s body, or add the init function as an event handler to DOMContentLoaded. But I’m sure you already have some functions which are executed onDOMready.