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JavaScript - Capturing Function Calls
Is it possible to capture function calls?
for example: alert('hello world'); is there a way to capture this function call. Why do i want to do this: 1. i need a way to test if a function exist before it is called, so i dont get undefined errors etc. 2. try/catch only works on sections of code, i need a global solutions.(can i capture functions calls on remotely loaded scripts, like google analytics etc ) Similar TutorialsI am trying to display some images in, say, 500ms intervals, but I want to loop through images, so I use a for loop and setTimeouts and function calls... Code: for (i=0;i<=5;i++)
{
setTimeout(DisplayTheImage, 500);
}
(a var that increments the image like image[x] is somewhere else) but I think all I accomplish is that while the above code calls the function 5 times alright, all five function calls occur simultaneously. Right? Eh, I want the function to be called 5 times, but at five different times, namely in 500ms intervals. I thought the function would wait to finish (500 ms) then another call and so on. How can I do that? Hi, I've been playing around trying to recreate the way in which jQuery chains it's functions for it's "select" then "do" behaviour. Note: I don't want to chain functions with jQuery, I want to chain them like jQuery. So based on the jQuery code what I have so far is (doesn't work in IE): Code: var x = function(string) {
return new x.fn.init(string);
};
x.fn = x.prototype = {
message: '',
init: function(string) {
x.fn.message = string;
},
log: function() {
console.log(x.fn.message);
}
};
x.fn.init.prototype = x.fn;
var start = function() {
x('hello world').log();
};
document.addEventListener('DOMContentLoaded', start, false);
The code works but when I watch '$' in jQuery "fn" & "prototype" show up as being "jQuery()" but in my code when I watch "x": "fn" and "prototype" are both shown as objects containing "message", "init" and "log" and in both cases "init" contains "prototype" which contains my three functions again and the nesting continues seemingly infinitely... I'm clearly missing something here. What are they doing in differently in jQuery to prevent this endless nesting loop? Hi, I have a search function which works when I only want to have only one search per page, but as it involves a string call I'm not sure how to modify it to multiple search requests on a page. The below works fine for one call: Code: <script type="text/javascript">
function showHint(str){
if (str.length==0){
document.getElementById("txtHint").innerHTML="";
return;
}
if (window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
else{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","getName.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<label>Search by name: </label>
<input type="text" id="txt1" class="input" onkeyup="showHint(this.value)" />
<br />
<p>Suggestions: <span id="txtHint"></span></p>
<br />
But if I want to do mulitple I have tried changing it to: Code: <script type="text/javascript">
function showHint(File,ID){
if (str.length==0){
document.getElementById(ID).innerHTML="";
return;
}
if (window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
else{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
document.getElementById(ID).innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET",File,true);
xmlhttp.send();
}
</script>
</head>
<body>
<label>Search by firstname: </label>
<input type="text" id="txt1" class="input" onkeyup="showHint('GetFirstName.php?q='+str,'txtHint')" />
<br />
<p>Suggestions: <span id="txtHint"></span></p>
<br /> <label>Search by surname: </label>
<input type="text" id="txt1" class="input" onkeyup="showHint('getLastName.php?q='+str,'txtHintSn')" />
<br />
<p>Suggestions: <span id="txtHintSn"></span></p>
<br />
The above doesn't work and I am not sure what do about the showHint(str) as clearly I am not representing it properly in my attempt to modify the script. I want to have a button in a form that only calls a Javascript function, but not refresh the page, how do I do this?
I have the following javascript function: [ function addNewWindowEvent(evType, fn) { if (window.addEventListener) { this.addEventListener("load", fn, false); return true; } else if (window.attachEvent) { var onload = "onload" this.attachEvent(onload, fn); return true; } else { return false; } } ] which is giving me a an exception every time a page on our site loads. The actual exception in firefox is this: uncaught exception: [Exception... "Could not convert JavaScript argument" nsresult: "0x80570009 (NS_ERROR_XPC_BAD_CONVERT_JS)" location: "JS frame :: https://cms-dev.stchas.edu/global/js/hdvscripts.js :: addNewWindowEvent :: line 5" data: no] and I'm not sure exactly what it's complaining about. I'm relatively new to javascript so diagnosing and fixing this problem has me quite puzzled, and so far I have been unable to find anything helpful when I try and google for information on this. I would appreciate any help or suggestions. Thanks. henryv Code:
<html>
<body>
var j=0;
var temp,temp2,temp3;
<script>
function scor(j)
{
switch(j)
{
case 1: alert("Απαντήσατε σωστά μόνο σε μία ερώτηση.Προσπαθήστε πάλι");
break;
case 2: alert("Απαντήσατε σωστά στις δύο από τις τρείς ερωτήσεις");
break;
default: alert ("Συγχαρητήρια απαντήσατε σωστά και στις τρεις ερωτήσεις");
}
}
</script>
<meta http-equiv="content-type" content="text/hmtl; charset=iso-8859-7">
<p align="center"><font size="5">Σε μία σελίδα html πόσα είναι τα μέγιστα frames που μπορούμε να τοποθετήσουμε; </p></font>
<form name="for1">
<input type="radio" name="fr1"value="1" > 5 <br>
<input type="radio" name="fr1"value="2" > Όσα τα pixels<br>
<input type="radio" name="fr1"value="3" > Δεν υπάρχει όριο<br>
<input type="button" value="Εκχώρηση Απάντησης" onClick="getVal1()">
</form>
<script type = "text/javascript">
function getVal1()
{
for(var i=0; i<document.for1.fr1.length; i++)
{
if (document.for1.fr1[i].checked)
{
if (document.for1.fr1[i].value==2)
{
j++;
}
}
}
}
function getVal2()
{
for (var i=0;i<document.for2.fr2.length;i++)
{
if (document.for2.fr2[i].checked)
{
if (document.for2.fr2[i].value==2)
{
j++;
}
}
}
}
function getVal3()
{
for (var i=0;i<document.for3.fr3.length;i++)
{
if (document.for3.fr3[i].checked)
{
if (document.for3.fr3[i].value==3)
{
j++;
}
}
}
}
</script>
<p align="center"><font size="5"> Είναι απαραίτητο σε κάθε σελίδα html να υπάρχουν τα tags head και title;</p></font>
<form name="for2">
<input type="radio" name="fr2" value="1"> Ναι <br>
<input type="radio" name="fr2" value="2"> Όχι <br>
<input type="button" value="Εκχώρηση Απάντησης" onClick="getVal2()">
</form>
<p align="center"><font size="5"> Τι κάνει το εξής tag: meta http-equiv="content-type" content="text/hmtl; charset=iso-8859-7" </p></font>
<form name="for3">
<input type ="radio" name="fr3" value="1"> Δημιουργεί τις προυποθέσεις για την απόκτηση τιμών <br>
<input type ="radio" name="fr3" value="2"> Ισσοροπεί τις παραγράφους σε στήλες <br>
<input type ="radio" name="fr3" value="3"> Επιτρέπει την κωδικοποίηση ελληνικών χαρακτήρων στην ιστοσελίδα <br>
<input type="button" value="Εκχώρηση Απάντησης" onClick="getVal3()"
</form>
<input type ="button" value="Υπολογισμός" onClick="scor(j)">
Apart from any logical mistakes this thing i have created might have , my question is this.Why upon pressing the last button and calling the "scor(j)" function , no alerts pop up?Thanks in advance. I'm completely stumbled by this as i have no clue as what might be wrong.But then again , my experience is extremely limited I am using a third party shopping cart service written in php. I don't have access to the php code so I decided to use javascript to write a cookie. What I'm trying to do is have the cookie capture the referring URL and then keep it for a day and have it follow where ever the visitor goes in the shopping cart. Then when they check out, the referring URL will populate a form field and be returned as part of the form results. This way I can track where my visitors come from. My code is below and I'm adding it to the file designated as the head section. (The files I have access to must use some form of include but I can't use php in them - just html and javascript. I've tried.) I have an alert in the code that suggests something to do as well as set the cookie. The alert comes up and the cookie is set but when you go to another page, the alert comes up again and another cookie is set. I just need to have it set once so when they fill out the order form, I'll know where they came from. This is my code and thanks for the help. Code: <SCRIPT LANGUAGE="JavaScript">
cookie_name = "dataCookie";
var referred;
function getName() {
if(document.cookie)
{
index = document.cookie.indexOf(cookie_name);
if (index != -1)
{
namestart = (document.cookie.indexOf("=", index) + 1);
nameend = document.cookie.indexOf(";", index);
if (nameend == -1) {nameend = document.cookie.length;}
referred = document.cookie.substring(namestart, nameend);
return referred;
}
}
}
referred=getName();
if (referred == "dataCookie")
{referred = "No-Referral"}
function getCookie(c_name) {
if (document.cookie.length>0) {
c_start=document.cookie.indexOf(c_name + "=")
if (c_start!=-1) {
c_start=c_start + c_name.length+1
c_end=document.cookie.indexOf(";",c_start)
if (c_end==-1) c_end=document.cookie.length
return unescape(document.cookie.substring(c_start,c_end))
}
}
return ""
}
function setCookie(c_name,value,expiredays) {
var exdate=new Date()
exdate.setDate(exdate.getDate()+expiredays)
document.cookie=c_name+ "=" + escape(value) + ((expiredays==null) ? "" : "; expires="+exdate.toGMTString())
}
function checkCookie()
{
{
var cookieEnabled=(navigator.cookieenabled)? true : false
//if not IE4+ nor NS6+
if (typeof navigator.cookieenabled=="undefined" &&!cookieEnabled)
{
document.cookie="testcookie"
cookieEnabled=(document.cookie.indexOf("testcookie")!=-1)? true : false
}
if (cookieEnabled)
{
var todaysdate = new Date()
var day = todaysdate.getDay()
switch (day)
{
case 1:
day = "Monday"
break
case 2:
day = "Tuesday"
break
case 3:
day = "Wednesday"
break
case 4:
day = "Thursday"
break
case 5:
day = "Friday"
break
case 6:
day = "Saturday"
break
case 0:
day = "Sunday"
break
}
var thedate = getCookie('thedate')
if (thedate != null && thedate != "")
{
if (day == thedate)
{}
else
{alert('Be sure to subscribe to our newsletter.')}
}
else
{
thedate = day
if (thedate!=null && thedate!="")
{
{
cookie_name = "dataCookie";
var referred;
if(document.cookie != document.cookie)
{index = document.cookie.indexOf(cookie_name);}
else
{ index = -1;}
if (index == -1)
{
referred=document.referrer;
document.cookie=cookie_name+"="+referred;
}
}
{setCookie('thedate', thedate, 365)}
alert('Be sure to subscribe to our newsletter.')
}
}
}
else
{alert('Please Enable Cookies. This site uses Cookies during your visit.')}
}
}
function addLoadEvent(func)
{
var oldonload = window.onload;
if (typeof window.onload != 'function')
{window.onload = func;}
else
{window.onload = function()
{if (oldonload)
{oldonload();}
func();
}
}
}
addLoadEvent(function() {
checkCookie();
});
//-->
</script>
In the body I am reading it with a form field of Code: <SCRIPT LANGUAGE="javascript">
document.write("<FORM>")
document.write("Originally Referred by:")
document.write("<INPUT id='cookiealert' TYPE=text style='width:300px' VALUE=" +referred+ ">");
document.write("</FORM>")
</SCRIPT>
Hello I need help regarding capturing page events(mouse click ,navigation) etc on web pages and write them into a text file (using javascript). One way is using javascript events and writing them into text file. Is there be a better way of doing this ?? My client has a training site that is associated with 4 different domains. If a user navigates away from one of the domains to another site (for instance www.google.com) they want to display a message and ask them if they want to leave the training site. my understanding of the window.location.href is that it will capture what is typed into the address bar until the request is submitted to the server but by then they are leaving the site. below is my code on the onbeforeunload event. conceptually: i want to capture the URL, compare the hostname and if the host name is one of the 4 domains then allow them to proceed, if it is not then as them if they want to leave the site. if they click ok allow them to move forward, if the click cancel then reload the page. I know this is considered bad design and i have expressed this but this how they want the site to behave. thanks ________________________________________________________________ [CODE] <script type="text/javascript"> function SiteCheck() { var strCurrentURL = window.location.href; var strNewHostName = strCurrentURL.split("/"); // for(i = 0; i < strNewHostName.length; i++) { alert(i + ' ' + strNewHostName[i]); } //strNewHostName[4] = "sddmtraining.org"; //test values //strNewHostName[4] == 'sddmtrain.org'; //test values //strNewHostName[4] == 'www.sddmtrain.web.org'; test values if (strNewHostName[4] == 'sddmtraining.org' || strNewHostName[4] == 'sddmtrain.org' || strNewHostName[4] == 'www.sddmtrain.web.org') ; else { var r = confirm("Are you sure you want leave the Training Site - Click Ok to Leave / Click Cancel to stay"); if (r==true) ; else { window.location.reload(window.location.href ); } } } </script> [\CODE] Hello experts, My first question folks. I have recently joined a web based video conference which allow people to join as a guest (no need to create account). This conference's interface and function is written in javascript as an applet. To cut the long story short, is it possible to capture this applet and see the conference (without having to join the conference)? What happen at the moment is people wont be able to see the conference without join in and therefore take one slot out of 7 seats if you like. When all slots are taken people can not see the event. I was wondering if there is a way to capture this event using other javascript. I have all the scripts required to make this conference running, i know the logic of how javascript works but i dont know what is what in detail. Can anyone suggest anything? Thanks. Codes for Dropdown menu based on radio buttons selection needed!? I need urgent help with this: I need codes for a dropdown menu that is altered by radio buttons. I want to insert the value selected from the dropdown menu into a table. here is my issue... i have an object and i need to call two functions. i need the onclick="something" to call a server side function and then i need another onclick="something" to call a javascript funtion... the problem is you can only have one "onclick" (similar to having one "class")... how can I set up an onclick that will call both my serverside function and my javascript function... I realize this is not specifically serverside section of forum, so pretend I am asking how to call two separate javascript functions with different names the item in question is here Code: <asp:Button ID="btn_gen1" runat="server" Text="InterventionCentral" class="show"
onclick="btn_gen1_Click" onclick="autohide" onmouseover="details_visible(1)" onmouseout="details_hidden(1)" />
just showing this to clarify that javascript does work with the asp and my mouse functions are working fine... my asp onclick works as well.. i can remove the asp and leave the js and it will work, but then all the stuff i do server side for the onclick goes away is this able to be done? this is for dev testing and i will eventually run into the same problem of needing to call two separate javascipt functions via onmouseover and also onmouseout This is the first function. Code: <html>
<head>
</head>
<body>
<script language="javascript" type="text/javascript">
function getthat****(){
num_a=Number(document.addition.entry_1.value);
num_b=Number(document.addition.entry_2.value);
num_c=Number(document.addition.entry_3.value);
num_d=Number(document.addition.entry_4.value);
num_e=Number(document.addition.entry_5.value);
valNum1=num_a*num_c
valNum2=num_a*num_d
valNum3=num_b*num_c
valNum4=num_b*num_d
valNum5=valNum1-valNum4
valNum6=valNum2+valNum3
valNum7=num_e/Math.sqrt(3)
valNum8=valNum7+valNum1-valNum4
document.addition.endVal1.value=valNum8;
document.addition.endVal2.value=valNum6;
}
</script>
<form name="addition">
<br>
impedance (rectangular)
<input type="text" name="entry_1"> + j
<input type="text" name="entry_2"> ohms
<br>
<br>
line current (rectangular)
<input type="text" name="entry_3"> + j
<input type="text" name="entry_4"> amperes<br><br>
<br>
<br>
line value of receiving voltage
<input type="text" name="entry_5"> volts (angle is zero degrees) (reference)
<br>
<br>
(<input type="text" name="endVal1"> + j
<input type="text" name="endVal2">) Volts
<br>
<input type="button" value="Product" onclick="getthat****()">
<input type="reset" value="Clear">
</form>
</body>
</html>
And this is the second one. Code: <html>
<head>
</head>
<body>
<script language="javascript" type="text/javascript">
function PolarConvert(){
num_1=Number(document.addition.entry_1.value);
num_2=Number(document.addition.entry_2.value);
valNum1=Math.pow(num_1,2);
valNum2=Math.pow(num_2,2);
valNum3=Math.sqrt(valNum1 + valNum2);
valNum4=Math.atan(num_2/num_1);
valNum5=(valNum4*180)/Math.PI;
document.addition.endVal.value=valNum3;
document.addition.endVal2.value=valNum5;
}
</script>
<form name="addition">
<input type="text" name="entry_1">+ j
<input type="text" name="entry_2"> =
<input type="text" name="endVal"> angle
<input type="text" name="endVal2"><br>
<input type="button" value="Convert to polar" onclick="PolarConvert()">
<input type="reset" value="Clear">
</form>
</body>
</html>
The question is how do I combine these given that the value that would be computed in function 2 is already computed in function 1 ? Thanks a lot !!! Below I have a facebook login/logout script for my website. The login works fine. The AJAX requests the php file, waits for the "Success" response, and then reloads the page. The logout doesn't. Instead the browser goes to the PHP file with just the word "Success" printed on it. I've separated the xml request as a separate function but that doesn't appear to solve it either. Code: <script type="text/javascript">
//Ajax XML Loaders
var xmlhttp;
function loadXMLDoc(url,cfunc)
{
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=cfunc;
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
window.fbAsyncInit = function() {
FB.init({appId: '215993265079207', status: true, cookie: true, xfbml: true});
/* All the events registered */
FB.Event.subscribe('auth.login', function(response) {
// do something with response
login();
});
FB.Event.subscribe('auth.logout', function(response) {
// do something with response
logout();
});
FB.getLoginStatus(function(response) {
if (response.session) {
// logged in and connected user, someone you know
}
});
};
(function() {
var e = document.createElement('script');
e.type = 'text/javascript';
e.src = document.location.protocol +
'//connect.facebook.net/en_US/all.js';
e.async = true;
document.getElementById('fb-root').appendChild(e);
}());
function fbloginClick(){
FB.login(function(response) {
if (response.session) {
if (response.perms) {
// user is logged in and granted some permissions.
// perms is a comma separated list of granted permissions
} else {
// user is logged in, but did not grant any permissions
}
} else {
// user is not logged in
}
},
{perms:'email,user_birthday'}
);
}
function login(){
//Fire the PHP Facebook Auth Script
loadXMLDoc('facebook_auth.php',function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
if (xmlhttp.responseText == "Success"){
window.location = "template.php";
}else{
window.location = "login_failed.php";
}
}
});
}
function fblogoutClick(){
FB.logout(function(response) {
});
}
function logout(){
//Fire the PHP Logout Script
loadXMLDoc('logout.php',function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
if (xmlhttp.responseText == "Success"){
window.location = "template.php";
}else{
window.location = "login_failed.php";
}
}
});
}
</script>
** sorry for posting this here. Kinda rushed on time, hoping for some clues. Hello, I am using this code: using prototype too. Code: Code: var haveData = false;
[xmllink1, xmllink2, xmllink3].each(function(xmlURL){
if(haveData == false){
new Ajax.Request( xmlURL, {
method: 'get',
contentType: "application/xml",
onSuccess: function( transport ) {
var titles = transport.responseXML.getElementsByTagName( 'titles' );
DO SOME WORK HERE
haveData = true;
throw $break;
}
},
onFailu function() {
return;
},
onException: function(request,error) {
return;
}
}
What I am trying to do is if my first item "xmllink1" has some data, we break out and end it and now we can 'build some structures' ie.. onSuccess If xmllink1 doesn't have any valid data, we go to xmllink2 etc.. and so forth. Basically, when I get some valid returns.. I want to then exit out of the loop and then act on my data. But I need it in order so I know that my xmllink1 is not being in a race conditiona with xmllink2 etc.. But what is happening is I have simulataneous things going on and I get an onException (because one of the links doesn't resolve or has bad data) and that ends up killing my javascript. How can I test in order.. if link1 is good, great.. exit the "each method" and act on that data.. if xmllink1 is bad (onfairlure or onexception) lets go to xmllink2 etc.... any ideas? Hi all, I would like to have an HTML button which, when clicked by the user, contacts the server and runs a Python script on the server. When the Python script finishes running, the current HTML page automatically reloads a file from the server. Is that possible? YJ My problem is the following. I have an editable <div>: <div class='edit' id='divContent' name='divContent' ContentEditable>some text</div> If I press 'enter' two lines are skipped. I know that if I press 'shift+enter' only one line will be skipped. If I check the unformatted code of the contenteditable div, 'enter' gives me <p> and 'shift+enter' gives me <br>, which makes sense because <p> is formatted differently than <br>. So I want to change 'enter' into 'shift+enter' I have already found something to capture and kill 'return' function killReturn() { key = event.keyCode; if (key == 13) return false; } But now for some means to replace the killed 'enter' with 'shift+enter'? Thanks a lot in advance for any advise! Hi, I am facing a problem in passing replace() function as an argument in user defined java function, can any one help me how to resolve it? intention is to pass a file path to my user defined function, but before passing the path i want to replace the character '\' to '\\' I am posting my javascript function he <a href="#" onclick="OpenDocPreview('<%# Eval("PATH")%>'.replace(/\\/g,"\\\\"), '<%# Eval("Filename")%>')"><%# Eval("DocTitle") %></a> function OpenDocPreview(url, docname) { alert('message from search base : ' + url + ' ' + docname); } thank you, I was working on a tutorial for some ajax uploading stuff and I ran across a new function syntax I don't recognize. I am not a Javascript pro, but I am not a newbie either. here is the code I am working on: Code: function handleFileSelect(e){
var files = e.target.files;
var output = [];
for(var i=0,f;f=files[i];i++){
if(f.type.match('image.*')){
var reader = new FileReader();
reader.onload = (function(theFile){
return function(e){
var span = document.createElement('span');
span.innerHTML = ['<img class="thumb" src="',e.target.result,'" title="',theFile.nbame,'" />'].join('');
document.getElementById('list').insertBefore(span,null);
};
})(f);
reader.readAsDataURL(f);
}
}
document.getElementById('list').innerHTML = '<ul>'+output.join('')+'</ul>';
}
document.getElementById('files').addEventListener('change',handleFileSelect,false);
To be a little more clear, the code in question is that is the very middle. The syntax I don't understand is: Code: class.event = (function(arguments){
//stuff you put in a function...
})(more Arguments?);
I tried to customize a simple one to learn for myself and I wrote this: Code: var a = 'A';
var b = 'B';
test = (function(t){
alert(t);
alert(b);
})(b);
test(a);
The browser would alert 'B' and that's it. The console would tell me that 'test is not a function.' OK, so I am confused. The topmost code works. What I am wondering is what the syntax is called for creating a function (or event listener?) that way, and how it works. Although if I new what it was called I could just google how it works. Hi All, I'm trying to convert an anonymous function to a real function (nesting is getting out of hand), however the msg object becomes undefined after conversion. Here is the converted anonymous function which fails: https://gist.github.com/2587613 and here is the original anonymous function which works: https://gist.github.com/2587667 Any help would be greatly appriciated |
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