We Keep Coding

How do I parse this function parameter that includes queryselector?

Code Context
We are trying to make our own custom data binding function work. So far, so good, as we got it working, but now we are refactoring.
Problem
I am trying to make the constructing of the function a little more user friendly. Currently to invoke it, it looks like this:
var obj = new MyBind(document.querySelectorAll('[data-bind="total"]'), 1234);
Error: Any elements bound are not being updated.
Ideally, I want to be able to pass a single parameter. But for this first round of refactoring, I want to simply pass the element name. Like this:
var obj = new MyBind("total", 1234);
Failed Efforts
I have tried the following without success:
// inside my function
this.elements = document.querySelectorAll(`[data-bind="${elements}"]`);
Live Demo
https://jsbin.com/qakutudole/edit?html,js,output
Anyone see why this isn't working?
Source Code
Here is the entire function:
function MyBind(elements, data) {
this.data = data;
this.elements = elements;
//this.elements = document.querySelectorAll(`[data-bind="${elements}"]`);
for( var i = 0; i < elements.length; i++ ) {
if(elements[i].tagName == 'INPUT' || elements[i].tagName == 'SELECT' || elements[i].tagName == 'TEXTAREA' ) {
elements[i].value = data;
} else if( elements[i].tagName == 'DIV' || elements[i].tagName == 'SPAN' || elements[i].tagName == 'B' ) {
elements[i].innerHTML = data;
}
elements[i].addEventListener("change", this, false);
}
}
MyBind.prototype.handleEvent = function(event) {
switch (event.type) {
case "change": this.change(event.target.value);
}
};
MyBind.prototype.change = function(value, updateAmounts) {
updateAmounts = typeof updateAmounts !== 'undefined' ? updateAmounts : true;
this.data = value;
for( var i = 0; i < this.elements.length; i++ ) {
if(this.elements[i].tagName == 'INPUT' || this.elements[i].tagName == 'SELECT' || this.elements[i].tagName == 'TEXTAREA' ) {
this.elements[i].value = value;
} else if( this.elements[i].tagName == 'DIV' || this.elements[i].tagName == 'SPAN' || this.elements[i].tagName == 'B' ) {
this.elements[i].innerHTML = value;
}
}
if( updateAmounts === true ) {
alert("Updating amounts!");
}
};
var obj = new MyBind(document.querySelectorAll('[data-bind="invoice_total"]'), 1234);
//var obj = new MyBind("invoice_total", 1234);

You will want to change
function MyBind(selector, data) {
// ^^^^^^^^
const elements = document.querySelectorAll(`[data-bind="${selector}"]`);
// ^^^^^^^^^^^^^^ ^^^^^^^^
this.data = data;
this.elements = elements;
so that the elements variable that you use subsequently in the code actually holds the elements, instead of being a string.

nextElementSibling Polyfill gives error 'Element' is undefined

I'm using IE in compatibility mode to support old web pages and also writing new pages.
I'm trying to use nextElementSibling so I've been adding the following Polyfill for it into my JS file. My goal is that if 'nextElementSibling' isn't supported then it will use the definition in the Polyfill.
Here's the Polyfill from the Mozilla site:
if (!("nextElementSibling" in document.documentElement)){
Object.defineProperty(Element.prototype, "nextElementSibling", {
get: function(){
var e = this.nextSibling;
while(e && 1 !== e.nodeType)
e = e.nextSibling;
return e;
}
});}
When I run this I get the error "'Element' is undefined."
I thought Element.prototype was built-in functionality.
Do I need to add something else before adding that Polyfill?
How do I get this working?
Any (relevant on topic) help would be greatly appreciated.
Update
Per a suggestion I tried the following but it's not executing the redefined nextElementSibling. Here's the code I put at the beginning of my JS file:
if (!("nextElementSibling" in document.documentElement))
{
if (!window.Element)
{
Element = function() { }
Element.prototype.nextElementSibling = function()
{
var e = this.nextSibling;
while (e && 1 !== e.nodeType)
e = e.nextSibling;
return e;
}
Element.prototype.firstElementChild = function()
{
var el = this.firstChild;
while (el && el.nodeType !== 1)
{
el = el.nextSibling;
}
return el;
}
var __createElement = document.createElement;
document.createElement = function(tagName)
{
var element = __createElement(tagName);
for (var key in Element.prototype)
element[key] = Element.prototype[key];
return element;
}
var __getElementById = document.getElementById;
document.getElementById = function(id)
{
var element = __getElementById(id);
for (var key in Element.prototype)
element[key] = Element.prototype[key];
return element;
}
}
}
Later in my JS file I do this:
var temp = this.parentElement.parentElement.nextElementSibling;
It doesn't work. The defined nextElementSibling never gets run and temp = undefined.

How do I invoke my function on keyup?

I have a JavaScript function that I want to fire once the user enters text inside an input element. Currently I can only see the function firing if I console.log it. How do I get it to fire using keyup method?
The relevant code is below.
var $ = function (selector) {
var elements = [],
i,
len,
cur_col,
element,
par,
fns;
if(selector.indexOf('#') > 0) {
selector = selector.split('#');
selector = '#' + selector[selector.length -1];
}
selector = selector.split(' ');
fns = {
id: function (sel) {
return document.getElementById(sel);
},
get : function(c_or_e, sel, par) {
var i = 0, len, arr = [], get_what = (c_or_e === 'class') ? "getElementsByClassName" : "getElementsByTagName";
if (par.length) {
while(par[I]) {
var temp = par[i++][get_what](sel);
Array.prototype.push.apply(arr, Array.prototype.slice.call(temp));
}
} else {
arr = par[get_what](sel);
}
return (arr.length === 1)? arr[0] : arr;
}
};
len = selector.length;
curr_col = document;
for ( i = 0; i < len; i++) {
element = selector[i];
par = curr_col;
if( element.indexOf('#') === 0) {
curr_col = fns.id(element.split('#'[1]));
} else if (element.indexOf('.') > -1) {
element = element.split('.');
if (element[0]) {
par = fns.get('elements', element[0], par);
for ( i =0; par[i]; i++) {
if(par[i].className.indexOf(element[1]> -1)) {
elements.push(par[i]);
}
}
curr_col = elements;
} else {
curr_col = fns.get('class', element[1], par);
}
} else {
curr_col = fns.get('elements', element, par);
}
}
return elements;
};

You need to bind your method to the keyup event on the page.
You could try
document.addEventListener('keyup', $)
Or assuming you have the input element as element you could do
element.addEventListener('keyup', $)
Your function will be passed the event which you could use to investigate the state of the element if you needed that information to trigger or not trigger things in the function.
Here's a quick sample where the function that get's run on keypress is changeColor.
var COLORS = ['red', 'blue','yellow', 'black']
var NCOLORS = COLORS.length;
function changeColor(ev) {
var div = document.getElementById('colored');
var colorIdx = parseInt(Math.random() * NCOLORS);
console.log(colorIdx);
var newColor = COLORS[colorIdx];
div.style.color = newColor
console.log("New color ", newColor)
}
document.body.addEventListener('keyup', changeColor)
Though I'm not using the event (ev), I like to show, in the code, that I expect that variable to be available.
See it in action here - http://codepen.io/bunnymatic/pen/yyLGXg
As a sidenote, you might be careful about calling your function $. Several frameworks (like jQuery) use that symbol and you may run into conflicts where you're overriding the global variable $ or where the framework overrides your version if it.

If page contains specific text then reload (using javascript)

If the text We are sorry but we made a boo boo appears then
Wait 5 seconds
reload
I would like to do this in JavaScript.
Here is an attempt
(function () {
"use strict";
function walkTheDOM(node, func) {
if (node && node.nodeType) {
if (typeof func === "function") {
func(node);
}
node = node.firstChild;
while (node) {
walkTheDOM(node, func);
node = node.nextSibling;
}
}
}
function filterElementsByContains(elements, string) {
var toStringFN = {}.toString,
text = toStringFN.call(elements),
result,
length,
i,
element;
if (text !== "[object NodeList]" && text !== "[object Array]" && !($() instanceof jQuery)) {
return result;
}
result = [];
if (typeof string === "string") {
string = new RegExp("^" + string + "$");
} else if (toStringFN.call(string) !== "[object RegExp]") {
return result;
}
function getText(node) {
if (node.nodeType === 3) {
text += node.nodeValue;
}
}
length = elements.length;
i = 0;
while (i < length) {
text = "";
element = elements[i];
walkTheDOM(element, getText);
if (string.test(text)) {
result.push(element);
}
i += 1;
}
return result;
}
if(filterElementsByContains([document.getElementsByTagName("table")[0]], /We are sorry but we made a boo boo/).length) {
location.reload();
}
The above could should, I think, work for the text if it appears in a specific place. I want to make it more general - so that the text could appear anywhere on that page.
Also, I would like to know how to add a pause so that, for example, it waits 5 seconds before reloading.
I guess I would add incorporate something like:
setTimeout(
function()
{
//location.reload();
}, 5000);

Just do an indexOf on the body's textContent/innerText property
var content = document.body.textContent || document.body.innerText;
var hasText = content.indexOf("We are sorry but we made a boo boo")!==-1;
if(hasText){
setTimeout(function(){
window.location = "http://www.example.com";
},5000);
}

This may work:
var bodyText = document.body.textContent || document.body.innerText;
var msg = "We are sorry but we made a boo boo";
if (bodyText.indexOf(msg) > -1) {
setTimeout(function() {
location.reload();
}, 5000);
}
--sorry for nearly duplicate answer :\ --
--edit--
Tell me - how can I add a second rule, it's a different way of
phrasing the error message: There was an internal error in our system.
We logged the problem and will investigate it later.
This will check for both messages:
var bodyText = document.body.textContent || document.body.innerText;
var msg = [
"We are sorry but we made a boo boo",
"There was an internal error in our system. We logged the problem and will investigate it later."
];
var flag = false;
for (var i = 0; i < msg.length; i++) {
if bodyText.indexOf(msg[i]) {
flag = true;
}
}
if (flag) {
setTimeout(function() {
location.reload();
}, 5000);
}
Explanation: All I did was modify msg to be an array of strings rather than a string itself. Then for every msg we want to check, we loop through the values and compare msg against bodyText. If bodyText contains one of the msg's, we set a flag to true, and then perform an if statement on flag.

If you want to check anywhere in the page... then you have to do just that. Get every DOM element and check if there is your String there... I do not think there is another way.
Yes using setTimeout will do the trick for waiting before reload.

Javascript IE 7 getting OBJECT element

I'm making a code that removes a videoplayer from the page and then places it back when needed (even if the element doesn't have an id).
I'm finding issues with IE7
Here is my code:
var weboElem, weboElemPar, weboElemIndex, weboStored;
function weboRemoveVideoplayer(vpId){
weboElem = document.getElementById(vpId);
if(!weboElem) return false;
weboElemPar = weboElem.parentNode;
weboElemIndex = 0;
var child = weboElem;
while( (child = child.previousSibling) != null )
weboElemIndex++;
weboElemPar.removeChild(weboElem);
return true;
}
function weboPlaceVideoplayerBack(){
if(weboElemPar.insertBefore !== undefined && weboElemPar.childNodes !== undefined)
{
weboElemPar.insertBefore(weboElem, weboElemPar.childNodes[weboElemIndex]);
return true;
}
return false;
}
var result = document.evaluate(
'//*/param[contains(#value, "autoplay=1")]/..', // XPath expression
document, // context node
null, // namespace resolver
XPathResult.ORDERED_NODE_SNAPSHOT_TYPE
);
if(result.snapshotLength > 0)
{
var node = result.snapshotItem(0);
node.id = "webo";
document.getElementById('info').innerHTML = node.nodeName.toLowerCase()+" -> "+node.id;
} else document.getElementById('info').innerHTML = "not found";
(Note that document.evaluate WORKS because I imported javascript-xpath library)
On IE7 if the XPath finds an IFRAME there are no problems and it works but if it finds an OBJECT does nothing and stops at weboElem = document.getElementById(vpId); as if it didn't find the id.
I tried modifying the code like this:
if(result.snapshotLength > 0)
{
var node = result.snapshotItem(0);
node.id = "webo";
node.parentNode.removeChild(node);
document.getElementById('info').innerHTML = node.nodeName.toLowerCase()+" -> "+node.id;
if(node.nodeName.toLowerCase() == "object") weboStored = node;
else weboStored = null;
} else document.getElementById('info').innerHTML = "not found";
and it works, the videoplayer disappears at page load. I want to use the function though, so I edited everything like this (storing the node into a global var that later I get in the weboRemoveVideoplayer function):
var weboElem, weboElemPar, weboElemIndex, weboStored;
function weboRemoveVideoplayer(vpId){
if(!weboStored) weboElem = document.getElementById(vpId);
else weboElem = weboStored;
if(!weboElem) return false;
weboElemPar = weboElem.parentNode;
weboElemIndex = 0;
var child = weboElem;
while( (child = child.previousSibling) != null )
weboElemIndex++;
weboElemPar.removeChild(weboElem);
alert("5");
return true;
}
function weboPlaceVideoplayerBack(){
if(weboElemPar.insertBefore !== undefined && weboElemPar.childNodes !== undefined)
{
weboElemPar.insertBefore(weboElem, weboElemPar.childNodes[weboElemIndex]);
return true;
}
return false;
}
// bind XPath methods to document and window objects
// NOTE: This will overwrite native XPath implementation if it exists
//XPathJS.bindDomLevel3XPath(); //solo per xpathJs
var result = document.evaluate(
'//*/param[contains(#value, "autoplay=1")]/..', // XPath expression
document, // context node
null, // namespace resolver
XPathResult.ORDERED_NODE_SNAPSHOT_TYPE
);
if(result.snapshotLength > 0)
{
var node = result.snapshotItem(0);
node.id = "webo";
node.parentNode.removeChild(node);
document.getElementById('info').innerHTML = node.nodeName.toLowerCase()+" -> "+node.id;
if(node.nodeName.toLowerCase() == "object") weboStored = node;
else weboStored = null;
} else document.getElementById('info').innerHTML = "not found";
This way the code blocks itself when trying to retrieve the parent node.
Could someone suggest me what to do here?
PS: with chrome and firefox the code works perfectly in the first version I posted.

Fixed it!
I solved the issue by wrapping the OBJECT inside a div with an id of my choice which I can retrieve whenever I want. I do this in the resolveXpath function.
Here the code:
var weboElem, weboElemPar, ieObject = false;
var weboElemIndex = 0;
function weboRemoveVideoplayer(vpId){
var child;
if(!ieObject) weboElem = document.getElementById(vpId);
else weboElem = document.getElementById('my_usage');
if(!weboElem) return false;
weboElemPar = weboElem.parentNode;
weboElemIndex = 0;
child = weboElem;
while( (child = child.previousSibling) != null ) weboElemIndex++;
if(typeof weboElemPar.removeChild !== 'undefined') weboElemPar.removeChild(weboElem);
else return false;
return true;
}
function weboPlaceVideoplayerBack(){
if(typeof weboElemPar.insertBefore !== 'undefined' && typeof weboElemPar.childNodes !== 'undefined' && typeof weboElemPar.appendChild !== 'undefined'){
if(weboElemPar.childNodes.length > 0 && weboElemIndex < weboElemPar.childNodes.length) weboElemPar.insertBefore(weboElem, weboElemPar.childNodes[weboElemIndex]);
else weboElemPar.appendChild(weboElem);
return true;
}
return false;
}
function resolveXpath(path)
{
//XPathJS.bindDomLevel3XPath(); //solo per xpathJs
var result = document.evaluate(path,document,null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE);
if(result.snapshotLength > 0){
var child, node = result.snapshotItem(0);
if(node.nodeName.toLowerCase() == 'object'){
ieObject = true;
child = node;
while( (child = child.previousSibling) != null ) weboElemIndex++;
var div = document.createElement('div');
div.id = 'my_usage';
if(typeof node.parentNode.insertBefore !== 'undefined' && typeof node.parentNode.childNodes !== 'undefined' && typeof node.parentNode.appendChild !== 'undefined'){
if(node.parentNode.childNodes.length > 0 && weboElemIndex < node.parentNode.childNodes.length) node.parentNode.insertBefore(div,node.parentNode.childNodes[weboElemIndex]);
else node.parentNode.appendChild(div);
div.appendChild(node);
} else return false;
} else node.id = 'my_usage';
return true;
} else return false;
}
resolveXpath('//*/param[contains(#src, "autoplay=1")]/..');