It's keydown event "event.preventDefault()" not worked when i used XMLHttpRequest object with synchronal request.
dear all. by the question title, i want to disabled "Tab" key in one input field in HTML page, it's normal worked by :
=========HTML================
<input id="fy" value="" onkeydown="doKeydown(this,event)">
==============================
=========SCRIPT===============
<script> function doKeydown(obj,ev){
if(ev.keyCode == 9){
if (ev.preventDefault){
ev.preventDefault();
ev.stopPropagation();
}
ev.cancelBubble=true;
}
} </script>
============================
but,when i add XMLHttpRequest with synchronal request in doKeydown function. it's can't worked....
====== <ALL HTML>=======
<meta http-equiv="Content-Type" content="text/html; charset=GB2312">
<title>FF XMLHttpRequest</title>
<script type="text/javascript">
function createXmlHttpObj(){
var _xmlHttp;
try {
_xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
_xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
_xmlHttp = null;
}
}
if (_xmlHttp==null && typeof XMLHttpRequest != 'undefined') {
_xmlHttp = new XMLHttpRequest();
}
return _xmlHttp;
}
function transCompany_ajax_codeValue(codeObjAry,containerObjAry,fieldStrAry,ev) {
var urlStr = "./test1.asp?transCompanyCode={arg0}";
ajax_codeValue1(codeObjAry
,containerObjAry
,fieldStrAry
,urlStr);
}
function ajax_codeValue1(codeObjAry,containerObjAry,fieldStrAry,urlStr,callbackFuncName) {
var _async = document.getElementById("is_async").checked;
for (i=0;i<codeObjAry.length;i++) {
urlStr = urlStr.replace("{arg" + i + "}",codeObjAry[i].value);
if (codeObjAry[i].value=="") {
hasNotInputFlag = false;
}
}
var xmlHttpObj = createXmlHttpObj();
//xmlHttpObj.async = _async;
xmlHttpObj.open("get",urlStr, _async);
xmlHttpObj.setRequestHeader("Content-Type", "text/xml");
//xmlHttpObj.setRequestHeader("X-Requested-With","XMLHttpRequest");
if(_async){
xmlHttpObj.onreadystatechange = function(){
//console.log("onReadyStateChange");
if (this.readyState == 4) {
if (this.status == 200) {
returnValueObj = eval("(" + this.responseText + ")");
for (i=0;i<containerObjAry.length;i++) {
if (containerObjAry[i]!=null) {
setObjShow(containerObjAry[i]
, eval("returnValueObj." + fieldStrAry[i]));
}
}
//console.log("load success");
} else{
}
}
} ;
}
xmlHttpObj.send();
if(!_async){
var returnValueObj = eval("(" + xmlHttpObj.responseText + ")");
for (i=0;i<containerObjAry.length;i++) {
if (containerObjAry[i]!=null) {
setObjShow(containerObjAry[i],eval("returnValueObj." + fieldStrAry[i]));
}
}
}
}
function oncodeChange(){
var obj = document.getElementById("fy") ;
var disObj = document.getElementById("uo");
var codeObjAry = new Array();
codeObjAry[0] = obj;
var containerObjAry = new Array();
containerObjAry[0] = disObj;
var filedAry = new Array();
filedAry[0] = "transCompanyName";
transCompany_ajax_codeValue(codeObjAry,containerObjAry,filedAry);
}
function setObjShow(obj,showValue) {
//when is cell object
try{
obj.setValue(showValue?showValue:"");
return;
}catch(e){
}
if (obj.tagName == "INPUT") {
obj.value = showValue?showValue:"";
} else {
obj.innerHTML = showValue?showValue:"";
}
}
function doKeydown(obj,ev){
if(ev.keyCode == 9){
oncodeChange();
if (ev.preventDefault){
ev.preventDefault();
ev.stopPropagation();
}
ev.cancelBubble=true;
}
}
</script>
async: <input type="checkbox" id="is_async">
<input id="fy" value="" onkeydown="doKeydown(this,event)">
<input id="uo" value="" size="100">
====== </ALL HTML>=======
========<SERVER PAGE USE ASP>===========
<%@ Language=VBScript %> <%response.charset="utf-8"%> <% if trim(request.queryString("transCompanyCode"))="" then
response.write "{""transCompanyName"":""Can not get name"",""transCompanyCode"":""""}"
response.end
end if
response.write "{""transCompanyName"":""Name " & trim(request.queryString("transCompanyCode")) &""",""transCompanyCode"":""a""}" %> ========</SERVER PAGE>===========
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check your other js code ...