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| /**
* Ajax.js
*
* Collection of Scripts to allow in page communication from browser to (struts) server
* ie can reload part instead of full page
*
* How to use
* ==========
* 1) Call retrieveURL from the relevant event on the HTML page (e.g. onclick)
* 2) Pass the url to contact (e.g. Struts Action) and the name of the HTML form to post
* 3) When the server responds ...
* - the script loops through the response , looking for <span id="name">newContent</span>
* - each <span> tag in the *existing* document will be replaced with newContent
*
* NOTE: <span id="name"> is case sensitive. Name *must* follow the first quote mark and end in a quote
* Everything after the first '>' mark until </span> is considered content.
* Empty Sections should be in the format <span id="name"></span>
*/
//global variables
var req;
var which;
/**
* Get the contents of the URL via an Ajax call
* url - to get content from (e.g. /struts-ajax/sampleajax.do?ask=COMMAND_NAME_1)
* nodeToOverWrite - when callback is made
* nameOfFormToPost - which form values will be posted up to the server as part
* of the request (can be null)
*/
function retrieveURL(url,nameOfFormToPost) {
//get the (form based) params to push up as part of the get request
url=url+getFormAsString(nameOfFormToPost);
//Do the Ajax call
if (window.XMLHttpRequest) { // Non-IE browsers
req = new XMLHttpRequest();
req.onreadystatechange = processStateChange;
try {
req.open("GET", url, true); //was get
} catch (e) {
alert("Problem Communicating with Server\n"+e);
}
req.send(null);
} else if (window.ActiveXObject) { // IE
req = new ActiveXObject("Microsoft.XMLHTTP");
if (req) {
req.onreadystatechange = processStateChange;
req.open("GET", url, true);
req.send();
}
}
}
/*
* Set as the callback method for when XmlHttpRequest State Changes
* used by retrieveUrl
*/
function processStateChange() {
if (req.readyState == 4) { // Complete
if (req.status == 200) { // OK response
///alert("Ajax response:"+req.responseText);
//Split the text response into Span elements
spanElements = splitTextIntoSpan(req.responseText);
//Use these span elements to update the page
replaceExistingWithNewHtml(spanElements);
} else {
alert("Problem with server response:\n " + req.statusText);
}
}
}
/**
* gets the contents of the form as a URL encoded String
* suitable for appending to a url
* @param formName to encode
* @return string with encoded form values , beings with &
*/
function getFormAsString(formName){
//Setup the return String
returnString ="";
//Get the form values
formElements=document.forms[formName].elements;
//loop through the array , building up the url
//in the form /strutsaction.do&name=value
for ( var i=formElements.length-1; i>=0; --i ){
//we escape (encode) each value
returnString=returnString+"&"+escape(formElements[i].name)+"="+escape(formElements[i].value);
}
//return the values
return returnString;
}
/**
* Splits the text into <span> elements
* @param the text to be parsed
* @return array of <span> elements - this array can contain nulls
*/
function splitTextIntoSpan(textToSplit){
//Split the document
returnElements=textToSplit.split("</span>")
//Process each of the elements
for ( var i=returnElements.length-1; i>=0; --i ){
//Remove everything before the 1st span
spanPos = returnElements[i].indexOf("<span");
//if we find a match , take out everything before the span
if(spanPos>0){
subString=returnElements[i].substring(spanPos);
returnElements[i]=subString;
}
}
return returnElements;
}
/*
* Replace html elements in the existing (ie viewable document)
* with new elements (from the ajax requested document)
* WHERE they have the same name AND are <span> elements
* @param newTextElements (output of splitTextIntoSpan)
* in the format <span id=name>texttoupdate
*/
function replaceExistingWithNewHtml(newTextElements){
//loop through newTextElements
for ( var i=newTextElements.length-1; i>=0; --i ){
//check that this begins with <span
if(newTextElements[i].indexOf("<span")>-1){
//get the name - between the 1st and 2nd quote mark
startNamePos=newTextElements[i].indexOf('"')+1;
endNamePos=newTextElements[i].indexOf('"',startNamePos);
name=newTextElements[i].substring(startNamePos,endNamePos);
//get the content - everything after the first > mark
startContentPos=newTextElements[i].indexOf('>')+1;
content=newTextElements[i].substring(startContentPos);
//Now update the existing Document with this element
//check that this element exists in the document
if(document.getElementById(name)){
//alert("Replacing Element:"+name);
document.getElementById(name).innerHTML = content;
} else {
//alert("Element:"+name+"not found in existing document");
}
}
}
} |
[Struts 1.3.8] Checkbox dont la valeur = true alors qu'elle est décochée
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