I have an HTML document with 6 Divs, I've written a javascript code that changes the heading depending on which div is selected (6 vars and 6 functions) e.g.
var divSelect = document.getElementById("firstDiv");
divSelect.onclick = function () {
var mainHeading = document.getElementById("heading");
mainHeading.innerHTML = "You have selected the first option";
};
I then have an anchor div which is linking to another HTML page, when it opens I want it to know which div was selected from the first HTML page, and then input a new heading based on the selection.
So I need to know which of the six functions was actioned based on the div that was clicked.
Any help much appreciated.
You can pass it in url query. Passing for example id parameter, like this: http://example.com/secondpage.html?firstpagedivid=firstDiv And then on second page you can parse url to get div id or whatever parameter you passed.
Here you can find how to get url parameter on second page: link
Html:
<div class="clickable" id="firstDiv">first</div>
<div class="clickable" id="secondDiv">second</div>
<div class="clickable" id="thirdDiv">third</div>
<br>
<div id="heading"></div>
<br>
<a id="navigator" href="second.html">Next page</a>
Javascript:
(function() {
var currentSelectedDiv;
var heading = document.getElementById('heading');
var navigator = document.getElementById('navigator');
var divs = document.querySelectorAll('.clickable');
for(var i=0; i<divs.length; i++) {
divs[i].onclick = function(e) {
var target = e.target;
currentSelectedDiv = target.getAttribute('id');
heading.innerHTML = ['You have selected ', currentSelectedDiv].join('');
}
}
navigator.onclick = function(e) {
e.preventDefault();
var a = e.target;
var href = a.getAttribute('href');
href += '?previousPageDivId=' + currentSelectedDiv;
alert(href);
//Just uncomment line below
//document.location.href = href;
}
})();
Here you have working example: https://jsfiddle.net/3wdzh2d4/
Related
I have two buttons SHOW and HIDE. When show is clicked numbers will appear (which are json files, each json file contain only one number 1, 2, 3..) when HIDE is clicked first number(json) in a row dissapear. For example we clicked SHOW button 3 times and got this: 1 2 3 and then clicked HIDE once then we got: 2 3 shown. My problem is when HIDE is clicked I want to save that hidden number by showing it in my div where id="nome". After another clicking on button HIDE another hidden number is shown and old is deleted from div. I tried this:
var pageCounter = 1;
var pageCounterr = 1;
var animalContainer = document.getElementById("animal-info");
var animalContainerr = document.getElementById("nome");
var btn = document.getElementById("btn");
var btnn = document.getElementById("btnn");
btn.addEventListener("click", function(){
var ourRequest = new XMLHttpRequest();
ourRequest.open('GET','http://10.0.9.243/animals-'+ pageCounter + '.json');
ourRequest.onload = function(){
var ourData = JSON.parse(ourRequest.responseText);
renderHTML(ourData);
};
ourRequest.send();
pageCounter++;
});
function renderHTML(data) {
var htmlString = document.createElement("div");
for (i=0; i < data.length; i++){
let pText = document.createTextNode(data[i].name);
let pElement = document.createElement("p");
pElement.append(pText);
htmlString.append(pElement);
htmlString.classList.add('containers') // new Line added
}
animalContainer.append(htmlString);
}
btnn.addEventListener("click", function(){
let containers = document.getElementsByClassName('containers');
if(containers.length > 0){
document.getElementById("nome").innerHTML = containers[0];
containers[0].remove();
}
});
<button id="btn">SHOW</button>
<button id="btnn">HIDE</button>
<h2>Numbers:</h2>
<div id="animal-info"></div>
<h2>Hidden number is:</h2>
<div id="nome"></div>
And what I get as a result is ' [object HTMLDivElement] ' in div with id="nome".
The only thing that is wrong is the used logic, look this:
When you get elements by class name "container" you are getting a array of this:
var htmlString = document.createElement("div");
Cause you defined that element's class to:
htmlString.classList.add('containers')
Then you're just getting div.
Solution:
Inside of this element you have a "p" element, and inside it you have a textNode with the content that you want!
Simple, good programming for you.
I am totally new at javascript and am trying to create a dynamic list in JavaScript that is both a hyperlink to and shows the text string of a tag in my html code that has the id = v1. Kind of like a menu to different parts of that same webpage.
I have tried to do this using document fragments (https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/Creating_hyperlinks#document_fragments) but it is not working and I don't have any idea of how to insert the text string of the in the "menu".
Here is part of my code:
var container = document.getElementById("contentarea");
var header = document.getElementById("v1");
for (i = 0; i < length.header; i++) {
$(document.createElement("li")).li;
$(document.createElement("a")).link.append(li)( {
href: "#v1"
})
list.appendChild(li);
container.appendChild(list)
}
You could do something like this
// div to get the textContent from, replace it with whatever you want
const divE = document.getElementById('test');
// our list tag
const list = document.getElementById('list');
// looping
for (let i = 0; i < 4; i++) {
const listEl = document.createElement('li'); // our list element
const aTag = document.createElement('a'); // a new <a> tag to append link
const linkTag = document.createElement('link'); //new link tag
linkTag.href = '#test'; // setting hyperlink
aTag.textContent = divE.textContent // setting the textContent for <a> tag
aTag.appendChild(linkTag); // appending link to the a tag
listEl.appendChild(aTag); // appending a tag to the <li> tag
list.appendChild(listEl) // finally appending our list element to the main list
}
<div id="test">Something here</div>
<ul id="list"></ul>
I have successfully created a button which adds text to the webpage however I do not know a viable way to remove text once this has been created. The js code I have is:
var addButtons = document.querySelectorAll('.add button');
function addText () {
var self = this;
var weekParent = self.parentNode.parentNode;
var textarea = self.parentNode.querySelector('textarea');
var value = textarea.value;
var item = document.createElement("p");
var text = document.createTextNode(value);
item.appendChild(text)
weekParent.appendChild(item);
}
function removeText() {
//document.getElementbyId(-).removeChild(-);
}
for (i = 0; i < addButtons.length; i++) {
var self = addButtons[i];
self.addEventListener("click", addText);
}
I have viewed various sources of help online including from this site however I simply cannot get any to work correctly. Thank you in advance.
Sure, it should be easy to locate the added <p> tag relative to the remove button that gets clicked.
function removeText() {
var weekParent = this.parentNode.parentNode;
var item = weekParent.querySelector("p");
weekParent.removeChild(item);
}
If there is more than 1 <p> tag inside the weekParent you will need a more specific querySelector.
<div id="wpq2">
<div class="subClass">
<a id="linkTO" class="subClass">New Item</a>
or
<a class="subClass">edit</a>
this list
</div>
</div>
i want to hide all the thing except
<a id="linkTO" class="subClass">New Item</a>
I do not have access to html ,
i have to use javascript
i tried somthing
var parentID = document.getElementById('wpq2');
var sub = parentID.getElementsByClassName('subClass');
var lastChild = sub[0].lastChild;
lastChild.style.display = 'none';
Using javascript no idea how to do
Please suggest
Try this instead:
var parentID = document.getElementById('wpq2');
//get the first inner DIV which contains all the a elements
var innerDiv = parentID.getElementsByClassName('subClass')[0];
//get all the a elements
var subs = innerDiv.getElementsByClassName('subClass');
//This will hide all matching elements except the first one
for(var i = 1; i < subs.length; i++){
var a = subs[i];
a.style.display = 'none';
}
Here is a working example
EDIT: The above will only hide the a element, as your text elements are not contained within specific elements then it becomes more tricky. If you are happy to effectively "delete" the HTML you don't want then you can do the following:
var parentID = document.getElementById('wpq2');
//get the first inner DIV which contains all the a elements
var innerDiv = parentID.getElementsByClassName('subClass')[0];
//get the HTML for the a element to keep
var a = innerDiv.getElementsByClassName('subClass')[0].outerHTML;
//replace the HTML contents of the inner DIV with the element to keep
innerDiv.innerHTML = a;
Here is an example
insert new html if you don't need the rest
document.getElementById('wpq2').innerHTML = '<a id="linkTO" class="subClass">New Item</a>';
var parentID = document.getElementById('wpq2');
var innerDiv = parentID.getElementsByClassName('subClass')[0];
var subs = innerDiv.getElementsByClassName('subClass');
subs.forEach(function (sub) { sub.style.display = 'none'; });
document.getElementById("linkTO").style.display = 'block';
I have the following script
var counter = 0;
function appendText(){
var text = document.getElementById('usertext').value;
if ( document.getElementById('usertext').value ){
var div = document.createElement('div');
div.className = 'divex';
var li = document.createElement('li');
li.setAttribute('id', 'list');
div.appendChild(li);
var texty = document.createTextNode(text);
var bigdiv = document.getElementById('addedText');
var editbutton = document.createElement('BUTTON');
editbutton.setAttribute('id', 'button_click');
var buttontext = document.createTextNode('Edit');
editbutton.appendChild(buttontext);
bigdiv.appendChild(li).appendChild(texty);
bigdiv.appendChild(li).appendChild(editbutton);
document.getElementById('button_click').setAttribute('onClick', makeAreaEditable());
document.getElementById('usertext').value = "";
counter++;
}
};
var makeAreaEditable = function(){
alert('Hello world!');
};
I want the makeAreaeditable function to work when the Edit button is pressed(for each of the edit buttons that are appended under the textarea).. In this state, the script, alerts me when i hit the Addtext button.
the following is the html. P.S. i need this in pure javascript, if you can help. thanks
<textarea id="usertext"></textarea>
<button onClick="appendText()">Add text </button>
<div id="addedText" style="float:left">
</div>
instead of:
document.getElementById('button_click').setAttribute('onClick', makeAreaEditable());
you need to do this:
editbutton.onclick = makeAreaEditable;
the function's name goes without brackets unless you want to execute it
instead of obtaining the element from the DOM using document.getElementById('button_click')
you can use the editbutton variable already created. this object is the DOM element you are looking for
SIDE NOTE:
the standard way to do it is to add the onclick property before appending the element