how return to top button works - javascript

I have looked around many places return to top button .when i click on that that takes me to top of the page.
some time some links taking me to particular place how does this works
is this html tack ticks or javascript..can i do this without page loading ?

<a name="top">Top of the page</a>
...
return to top
Note: HTML5 recommends using id="top" rather than name="top"

return to top
The #top bit refers to the id of an element that resides at the top of your page. In most cases this will be something like #header where you have:
<div id="header"></div>
at the top of the page. I'd suggest not using name as I believe the attribute is now deprecated.
Of course, to make it a little more fancy you could use something like:
http://webdesignerwall.com/tutorials/animated-scroll-to-top

If you require to jump to a particular portion of the page by default during page than read on:
Just append the id of the tag with URL.
Eg:
<div id='myID'>Some content</div>
Now if your URL ends with #myID than it shall jump to that portion automatically.

Lastly you can use javascript too:
<a href="#" onclick="document.getElementById('someId').scrollIntoView(); return false</a>
but assuming all modern browsers can do some id it is less needed nowadays

Related

Javascript: Text in arrays and multiple textareas

I'm trying to load a parent page into an object tag, and whilst I can get an alert to show I've got the code, I cannot get it into the <object> Any clues?
var page=parent.document.documentElement.innerHTML;
alert(page);
document.getElementById('close_skin').style.visibility="visible";
document.getElementById('show_skin').style.visibility="visible";
document.getElementById('show_skin').setAttribute("data",page);
Assuming I can get the code to appear, how can I "toggle" to a different set of styles? The parent uses ".xxx_fixed" classes, but the code in the object needs to use the ".xxx_float" classes that are also in the template CSS at top of page. (When I did it in another PERL program, it was easy just to rename the tags in the <body> from "class='xxx_fixed' " to "class='xxx_float' " (Can't do that so easily with global javascript replace as that would also rename the classes at top of code as well!)
I have just tried adding some script to the top of the var page object - which MAY work if I can get the code to appear ...
+'document.getElementById(\'icon_outer\').setAttribute(\'class\', \'icon_outer_float\')'
If you're interested as to the "why", the "fixed" keep menu / top bar fixed in one place when viewed in full screen browser, but the 'float' makes everything move in unison within the <object> "window" allowing viewer to pan around the template page like a static magnifying glass;
.menu_back_float{position:relative;top:0px;background-color:#f5eca4;min-height:520px;height:auto}
.menu_back_fixed{position:relative;top:35px;background-color:#f5eca4;min-height:550px;height:auto}
To load the parent page into an <object> element, you have to specify the URL of the page. To get the code and place it in a alert box, you can use jQuery's $.get() method (as long as you load it via a proxy domain), like this:
HTML:
// I'm just using W3Schools just to save time
<object data="http://www.w3schools.com/" width="1500" height="1200">
<embed src="http://www.w3schools.com/" width="1500" height="1200"></embed>
Your browser does not support the object tag.
</object>
JavaScript:
window.jQuery.get("http://www.yourdomain.com/?url=www.w3schools.com", function(response) {
window.alert(response);
}
For the second part of your question, you can use jQuery to change the name of the class from .xxx_fixed to .xxx_float:
function main() {
$('object').removeClass('xxx_fixed').addClass('xxx_float');
}
$(document).ready(main);
Hopefully I have answered your question correctly and thouroughly, and if I haven't, feel free to let me know so I can edit this.

HTML Anchor tag issue

I have a piece of code like below
<div>
<ul>
<li>Test1</li>
-------
-------
-------
<li>Test46</li>
</div>
It displays the html page with 46 links. The issue is when i scroll down and select the 46th or the ones just above this the page is going back to the top again. why is it happening so and is there any way to prevent it ?
href is blank thats why its going at top. You can use this instead of keeping blank:
Test46
href="" contains the URL "" which is a relative URL that resolves to "the URL of the current page".
When you click on the link, the browser follows it and goes to the current page.
As is normal (absent of any specific directive otherwise), when it goes to a page, it starts at the top.
If you don't want to link to the page: Why are you using a link in the first place?
If you just want something to dangle JavaScript from, use a button instead.
<button type="button">Test46</button>
You can style it to remove the default background colour and border, and set the colour scheme to match that of a link if you want it to look like a link.
An empty string in the href attribute <a href=""> means in modern browsers to go to the current page. This will basically just reload the current page, and as such it will go to the top.
One way to prevent from going to the top is to use href="javascript:void(0)", as mentioned by #Manwal or you can simply remove the href attribute completely (note in that case it will not show up as a clickable hyper-link).

How to select class element inside div in jquery

I am trying to implement the smooth scrolling effect described here jquery smooth scroll to an anchor?
using Godaddy's Website builder tool. Unfortunately the tool adds lots of its own boiler-plate code and my own markup ends up inside it. It seems therefore that the jquery script is never called and instead of the smooth scroll effect, I have the usual "jump" to the target section.
The tool-generated markup is as follows, where the external div element has been added and "wraps" my own markup (anchor element):
<div class="wsb-htmlsnippet-element"><a class="scroll" href="#things">Supported Things</a></div>
In a simular way the target element id is also enclosed in a div:
<div class="wsb-htmlsnippet-element"><section id="things"><h2>Supported Things</h2></section></div>
How should I modify the original script, which is reproduced below in order to make it work no matter how much additional divs (or other elements) the Website builder tool uses to wrap my own custom markup?
$(".scroll").click(function(event){
event.preventDefault();
//calculate destination place
var dest=0;
if($(this.hash).offset().top > $(document).height()-$(window).height()){
dest=$(document).height()-$(window).height();
}else{
dest=$(this.hash).offset().top;
}
//go to destination
$('html,body').animate({scrollTop:dest}, 1000,'swing');
});
To select a class element inside your div:
$("div.wsb-htmlsnippet-element").find(".someclass").click(function(event){
.
.
.
});
As far as I can see, your script already works no matter how many elements wrap around your anchor.
Edit: Thanks for the downvote, I am correct though: https://jsfiddle.net/wfvjus0h/
<div class="whatever"><div class="ok">
<div class="wsb-htmlsnippet-element"><a class="scroll" href="#things">Supported Things</a></div>
</div></div>
<div class="longdiv">aeaeaeae</div>
<div class="wrapper1""><div class="wrapper2"><div id="things">Things</div></div></div>

changing dynamically the "onlink" id in css

I made a navigation bar as tabs in my website, and I used the onlink identity to specify the current tab with certain characteristics. My problem is that when I change tabs, I don't know how to make the previous tab id set as none and the current one set as onlink.
Here's the navigation bar code:
<div id="indNavBar">
<div id="indHolder">
<ul>
<li><a onclick="DisplayDIV('IndPage');HideDIV('DoubleInd')" id="onlink">Single Indicator</a></li>
<li><a onclick="DisplayDIV('DoubleInd');HideDIV('IndPage');">Double Indicators</a></li>
</ul>
</div>
</div>
There's a simple ways but it's somehow stupid, which is to make each current tab as a whole page and when I click another tab, it's just given the url of clicked tab which goes to the page with specified onlink id, but this requires reloading the whole page that's why I'm seeking a better solution.
You can get the control being clicked by passing this in javascript method
onclick="DisplayDIV('IndPage', this);
function DisplayDIV(IndPage, sourceObj)
{
alert(sourceObj.id);
}
Are you ok do use the jQuery Library?
If so you can avoid putting inline javascript into your html and use toggleClass http://api.jquery.com/toggleClass/
You are trying to use HTML ids in the wrong way.
Ids are unique identifiers for HTML tags. They should not change at runtime.
Instead, apply CSS classes to the tab you want to be visible.
CSS
.hide {display:none;}
Javascript
var indpage = document.getElementById("IndPage");
if (!indpage.classList.contains("hide")) {
indpage.classList.add("hide");
}
Then your HTML at runtime will change to
<div id="IndPage" class="hide">...</div>
This is the standard approach.
And you can do much more with this idea.
I agree that making a tab a whole page is not a good idea. You can use javascript to apply CSS classes to hide and remove that class to show again.
Its also a good idea to learn how to separate your javascript from your HTML. Please read some more tutorials on this. One for instance: Unobtrusive Javascript
Here is a jquery way to do it: http://jsfiddle.net/surendraVsingh/HyAhL/
$('#indHolder a').click(function(){
$(this).attr('id', 'onlink');
$(this).parent().siblings().find('a').removeAttr('id');
});​
I took hints from the answers above and it worked as the following:
function putOnlink(x){
document.getElementById('onlink').id = "none";
$(x).attr('id','onlink');
}
and the tabs code is:
<div id="indNavBar">
<div id="indHolder">
<ul>
<li><a onclick="DisplayDIV('IndPage');HideDIV('DoubleInd');putOnlink(this);" id="onlink">Single Indicator</a></li>
<li><a onclick="DisplayDIV('DoubleInd');HideDIV('IndPage');putOnlink(this);document.getElementById('onlink').id='none'">Double Indicators</a></li>
</ul>
</div>
</div>
I just wanna not that in the second link I had to change the id of the first link twice because it didn't work once, maybe cause its id is set in the tag not just when clicked.

What does href expression do?

I have seen the following href used in webpages from time to time. However, I don't understand what this is trying to do or the technique. Can someone elaborate please?
An <a> element is invalid HTML unless it has either an href or name attribute.
If you want it to render correctly as a link (ie underlined, hand pointer, etc), then it will only do so if it has a href attribute.
Code like this is therefore sometimes used as a way of making a link, but without having to provide an actual URL in the href attribute. The developer obviously wanted the link itself not to do anything, and this was the easiest way he knew.
He probably has some javascript event code elsewhere which is triggered when the link is clicked, and that will be what he wants to actually happen, but he wants it to look like a normal <a> tag link.
Some developers use href='#' for the same purpose, but this causes the browser to jump to the top of the page, which may not be wanted. And he couldn't simply leave the href blank, because href='' is a link back to the current page (ie it causes a page refresh).
There are ways around these things. Using an empty bit of Javascript code in the href is one of them, and although it isn't the best solution, it does work.
basically instead of using the link to move pages (or anchors), using this method launches a javascript function(s)
<script>
function doSomething() {
alert("hello")
}
</script>
click me
clicking the link will fire the alert.
There are several mechanisms to avoid a link to reach its destination. The one from the question is not much intuitive.
A cleaner option is to use href="#no" where #no is a non-defined anchor in the document.
You can use a more semantic name such as #disable, or #action to increase readability.
Benefits of the approach:
Avoids the "moving to the top" effect of the empty href="#"
Avoids the use of javascript
Drawbacks:
You must be sure the anchor name is not used in the document.
The URL changes to include the (non-existing) anchor as fragment and a new browser history entry is created. This means that clicking the "back" button after clicking the link won't behave as expected.
Since the <a> element is not acting as a link, the best option in these cases is not using an <a> element but a <div> and provide the desired link-like style.
is just shorthand for:
It's used to write js codes inside of href instead of event listeners like onclick and avoiding # links in href to make a tags valid for HTML.
Interesting fact
I had a research on how to use javascript: inside of href attribute and got the result that I can write multiple lines in it!
<a href="
javascript:
a = 4;
console.log(a++);
a += 2;
console.log(a++);
if(a < 6){
console.log('a is lower than 6');
}
else
console.log('a is greater than 6');
function log(s){
console.log(s);
}
log('function implementation working too');
">Click here</a>
Tested in chrome Version 68.0.3440.106 (Official Build) (64-bit)
Tested in Firefox Quantum 61.0.1 (64-bit)
It is a way of making a link do absolutely nothing when clicked (unless Javascript events are bound to it).
It is a way of running Javascript instead of following a link:
link
When there isn't actually javascript to run (like your example) it does nothing.
Refer to this:
Link to the website opened in different tab
Link to the div in the page(look at the chaneged url)
Nothing happens if there is no javaScript to render
javascript: tells the browser going to write javascript code
Old thread but thought I'd just add that the reason developers use this construct is not to create a dead link, but because javascript URLs for some reason do not pass references to the active html element correctly.
e.g. handler_function(this.id) works as onClick but not as a javascript URL.
Thus it's a choice between writing pedantically standards-compliant code that involves you in having to manually adjust the call for each hyperlink, or slightly non-standard code which can be written once and used everywhere.
Since it is a styling issue, instead of polluting the HTML with non valid syntax, you could/should use a W3 valid workaround:
Format the HTML properly, without href, following the W3 accessibility guide lines for buttons.
Use CSS to fix the initial goal of applying a clickable UX effect on a control.
Here's a live example for you to try the UX.
HTML
<a role="button" aria-pressed="false">Underlined + Pointer</a>
<a role="button" aria-pressed="false" class="btn">Pointer</a>
CSS
a[role="button"]:not([href]):not(.btn) { text-decoration: underline; }
a[role="button"]:not([href]) { cursor: pointer; }
I was searching for a solution that does not refresh pages but opens menu items on Ipads and phones.
I tried it on also mobile, It works well
Dr
1. Use that java script to Clear an HTML row Or Delete a row using the id set to a span and use JQuery to set a function to that span's click event.
2. Dynamically set the div html to a string variable and replace {id} with a 1 or 2 etc. cell of a larger div table and rows
<div class="table-cell">
<span id="clearRow{id}">
Clear
</span>
</div>
<div class="table-cell">
<span id="deleteRow{id}">
Delete
</span>
</div>
//JQuery - Clear row
$("#clearRow" + idNum).click(function(){
$("someIDOrWildcardSelector" + idNum).val("");
$("someIDOrWildcardSelector" + idNum).val("");
$("someIDOrWildcardSelector" + idNum).val("");
});
//JQuery to remove / delete an html row
$("#deleteRow" + idNum).click(function(){
//depending upon levels of parent / child use 1 to many .parent().parent().parent()
$(this).parent().remove();
});

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