Error in javascript - javascript

I am trying to get a collapsible link list to work using JavaScript.
However, there is a continual error in the Java document and I don't know why:
var css Node = document.createElement('link');
cssNode.setAttribute('rel', 'stylesheet');
cssNode.setAttribute('type', 'text/css');
cssNode.setAttribute('href', 'javascript-overrides.css');
document.getElementsByTagName('head')[0].appendChild(cssnode);
function toggle(toggler) {
if (document.getElementById) {
targetElement = toggler.nextsibling;
if (targetElement.classname == undefined) {
targetElement = toggler.nextsiblig.nextsibling;
}
if {
targetElement.style.display == "block") {
targetElement.style.display = "none";
}
else {
targetElement.style.display = "block"
}
}
}
function swap(targetid) {
if (document.getElementById) {
target = document.getElementById(targetid);
if (target.style.display == "block") {
target.style.display = "none";
}
else {
target.style.display = "block";
}
}
}
The error in on line 15 where is states "if ( document.getElementById){" but it seems fine to me.
Any advice?

jsLint returns 3 errors (and assuming your first line is var cssNode)
Compare to undefined with === ( if (targetElement.classname === undefined) )
if { targetElement.style.display == "block")} must be if (
Missing semicolon (targetElement.style.display = "block")
Broken Fiddle here (Push the jsLint button to see the errors)
Fixed Fiddle here

Related

Toggle Menus using buttons in JS - But it shows both menus

i want to toggle two menus offered by two buttons.the issue is when i click on button one, it shows the menu bound with button one but when i click the other, it shows both instead of hiding the first one and vice versa, on my login page. The menus are identified by the ids of; 'reqpwd' and 'signup' in html / JS. What is worng? also suggest improvement in code if possible. My JS code:
<script>
window.onload = function() {
document.getElementById('reqpwd').style.display = 'none';
document.getElementById('signup').style.display = 'none';
};
function chk(elm) {
var signup_ = signup.id;
var reqpwd_ = reqpwd.id;
elm_ = elm.id;
if (elm_ == reqpwd_){
hide(signup_);
show(reqpwd_);
}
if (elm_== signup_){
hide(reqpwd_);
show(signup_);
}
};
function show(abc) {
var menuBox = document.getElementById(abc);
if(menuBox.style.display == "none") { // if is menuBox displayed, hide it
menuBox.style.display = "block";
} };
function hide(abc){ // if is menuBox hidden, display it
var menuBox = document.getElementById(abc);
if(menuBox.style.display == "block"){
menuBox.style.display == "none";
}
};
</script>
Instead of menuBox.style.display == "none"; try using menuBox.style.visibility== "hidden";
Edit:
I have changed a few things in your code. Didn't make a whole lot of sense to me the way you're setting the styles on load (missing HTML), so I had to use IDs that made sense to me.
Edit:
Ok, my bad. I updated the code. I think the problem is on hide you're using double equals instead of single equals on menuBox.style.display == "none";. Thus the menu is never hiding.
https://codepen.io/juanferrer/pen/qmOmWa
Finally i have landed into something like this using the flag variable as a state indicator.. now the only requirement is to check toggle as well as disappear the relevant menu by the same button..i.e. if signup menu is already open, the signup or reset button should close it and vice versa.
window.onload = function() {
document.getElementById('regd').style.visibility = 'hidden'; //regisration msg
document.getElementById('rset').style.visibility = 'hidden'; //reset msg
document.getElementById('reqpwd').style.display = 'none';
document.getElementById('signup').style.display = 'none';
};
var flag = 0;
function chk(elm) {
var signup_ = signup.id;
var reqpwd_ = reqpwd.id;
elm_ = elm.id;
if (elm_ == reqpwd_ && flag === 0 || elm_ == reqpwd_ && flag == 2) {
flag = 1;
hide(signup_);
show(reqpwd_);
}
if (elm_ == signup_ && flag === 0 || elm_ == signup_ && flag == 1) {
flag = 2;
show(signup_);
hide(reqpwd_);
}
if (elm_ == reqpwd_ && flag == 1 || elm_ == signup_ && flag == 2) {
hide(elm_);
flag = 0;
}
};
function show(abc) {
var menuBox = document.getElementById(abc);
if (menuBox.style.display === "none") { // if is menuBox hidden, display it
menuBox.style.display = "block";
}
};
function hide(abc) { // if is menuBox
var menuBox = document.getElementById(abc);
if (menuBox.style.display === "block") { //if displayed, hide it
menuBox.style.display = "none";
}
};

How to set a key to change style of a node?

I'm doing an userscript of Greasemonkey and I want set a key to change style display:"" of none to block and vice versa of a node by press a key ("Home" in this case).
var bluebar = document.getElementById('pagelet_bluebar');
bluebar.style.display = "none";
document.addEventListener("keydown", function (e) {
if (e.keyCode == 36) {
showhideui();
}
}, false);
function showhideui() {
if (bluebar.style.display = "none") {
bluebar.style.display = "block";
} else if (bluebar.style.display = "block") {
bluebar.style.display = "none";
}
}
The solution was add == instead = in the conditions:
if (bluebar.style.display == "none")
else if (bluebar.style.display == "block")
Use == or === instead of single = sign in your comparison.
Check this link about comparison operators
var bluebar = document.getElementById('pagelet_bluebar');
document.addEventListener("keydown", function (e) {
if (e.keyCode === 36) { //press "Home" key change to block/none
showhideui();
}
}, false);
function showhideui() {
if (bluebar.style.display == "none") { //if is none
bluebar.style.display = "block" ; //change to block
} else if (bluebar.style.display == "block" || bluebar.style.display == "") { //if is block
bluebar.style.display = "none"; //change to none
}
}
Ps: If there is only those two possibilities, you could even use a more synthetic way :
(bluebar.style.display == "block" || bluebar.style.display == "") ? bluebar.style.display = "none" : bluebar.style.display = "block";

Making visible object hidden and hidden object visible

I have a javascript function that is supposed to make visible objects hidden and hidden objects visible. since I lack of basic javascript knowlegde, I came here to ask help from you :/ Can someone help me out with my code so that I can learn a little?
function DisplayMenu(obj) {
if (obj.style.visibility == 'visible') {
obj = document.getElementById(obj);
obj.style.visibility = 'hidden';
}
else if (obj.style.visibility == 'hidden') {
obj = document.getElementById(obj);
obj.style.visibility = 'visible';
}
}
You need to define what obj is before the if:
function DisplayMenu(obj) {
var obj = document.getElementById(obj);
if (obj.style.visibility == 'visible') {
obj.style.visibility = 'hidden';
}
else {
obj.style.visibility = 'visible';
}
}
EDIT: You could simplify it, you don't need the else if just use else
And even shorter version which checks for existance of obj_id before assignment, so in the case there is no obj_id in DOM it doesn't trigger exception:
function DisplayMenu(obj_id) {
var obj = document.getElementById(obj_id);
obj && obj.style.visibility = (obj.style.visibility == 'visible') ? 'hidden' : 'visible';
}

Javascript - Display div

I need to check onload if an anchor is within the URL to open a tab if required. The problem is that if a user opens a tab before the onload function gets fired, the tab gets closed and the user needs to open it again.
How to fix that?
HTML:
<body onload="checkurl()">
JS:
function checkurl(){
if (window.location.hash == '#about')
{
showhide('secabout');
}
else if (window.location.hash == '#contact')
{
showhide('seccontact');
}
}
JS function:
var divState = {};
function showhide(id) {
if (document.getElementById) {
var divid = document.getElementById(id);
divState[id] = (divState[id]) ? false : true;
for (var div in divState){
if (divState[div] && div != id){
document.getElementById(div).style.display = 'none';
divState[div] = false;
}
}
divid.style.display = (divid.style.display == 'block' ? 'none' : 'block');
}
}
Thanks.
Uli
I'm pretty sure that <script> tags inside of <head> execute right away before onload() so try that.
You can call the function with an extra parameter to make sure will show in your load function.
Then check on a global initialized variable to check if the function has already been executed by user when running from the checkurl function. This is required if the user clicks on a different tab than the one specified in the URL.
Also you need to check on divState[id] instead of divid.style.display == 'block' when updating divid.style.display at bottom.
function checkurl(){
if (window.location.hash == '#about')
{
showhide('secabout', true);
}
else if (window.location.hash == '#contact')
{
showhide('seccontact', true);
}
}
var divState = {};
var initialized = false;
function showhide(id, initialize) {
if(initialized && initialize) return;
initialized = true;
if (document.getElementById) {
var divid = document.getElementById(id);
divState[id] = (divState[id]) ? false : true;
for (var div in divState){
if (divState[div] && div != id){
document.getElementById(div).style.display = 'none';
divState[div] = false;
}
}
if(initialize){
divid.style.display = 'block';
} else {
divid.style.display = (divState[id] ? 'block' : 'none');
}
}
}

javascript hide/show fails in ie8

I have the following javascript
function hide(id)
{
var ele = document.getElementById(id);
if ((ele.style.display == 'none') || (ele.style.display == '')) {
try{
ele.style.display = 'table-row';
}
catch (e)
{
ele.style.display='block';
}}
else {ele.style.display = 'none';}
}
which works in ie7, chrome, ff, but fails in ie8
I have to get it to work in ie8 even if it fails in chrome or ff.
I believe the issue is 'ele.style.display = 'table-row'
any ideas? thanks in advance
Not sure what you are experiencing as a failure in IE8, but you might change in your if this:
ele.style.display == ''
to this:
ele.style.display == undefined
Why don't you use:
function toggle(id) {
var el = document.getElementById(id);
el.style.display = (el.style.display == "none" || el.style.display == "") ? "block" : "none";
}

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