Create breadcrumbs dynamically on client side using javascript

问题

I want to create breadcrumbs dynamically on client side using java script. The breadcrumbs will be the path followed by user while navigation as: Home > about us > our history..

The anchor tags will be generated on each page in the sequence in which the user navigate.

Now I can create these breadcrumbs using server side technology easily but I want to generate it dynamically on each page on client side. Now I don't know exactly how to implement it.

Some logic in my mind is as:

Create an object type variable in java script with a name and value pair where name is the name of current page and value is the url of that page.
Now pass this object variable using query string while navigating from one page to other.
Then in the second page get that object variable from query string and extract the name and value pair from that object and then using that create the anchor and add it to targeted div (place holder).
Again when user goes to another page add the name and value pairs for all the previous pages along with the name and value pair for current page at the last in the object variable and pass it to next page using query string.
Now in next page do the same and create anchors.

Some what similar I got here using html5 client side storage as: html:

<ul id="navigation_links">
    <li>Page1</li>
    <li>Page2</li>
    <li>Page3</li>
</ul>

js:

$(document).ready(function(){
    bindEventToNavigation();
});

function bindEventToNavigation(){
    $.each($("#navigation_links > li"), function(index, element){
        $(element).click(function(event){
            breadcrumbStateSaver($(event.currentTarget).html());
            showBreadCrumb();
        });
    });
}


function breadcrumbStateSaver(text){
    //here we'll check if the browser has storage capabilities
    if(typeof(Storage) != "undefined"){
        if(sessionStorage.breadcrumb){
            //this is how you retrieve the breadcrumb from the storage
            var breadcrumb = sessionStorage.breadcrumb;
           sessionStorage.breadcrumb = breadcrumb + " >> "+text;
        } else {
           sessionStorage.breadcrumb = ""+text; 
        }
    }
    //if not you can build in a failover with cookies
}

function showBreadCrumb(){
     $("#breadcrumb").html(sessionStorage.breadcrumb);   
}
<div id="breadcrumb"></div>

but here instead of creating hyperlinked anchors it is creating simple text, whereas I want the breadcrumbs to be anchors and hyperlinked to their respective pages.

I am new to java script and don't know how to implement this. If you have any better logic and solution for this please tell me.

thanks in advance.

回答1:

When you are adding the items to the breadcrumb you are not adding them as links, you are just adding text and the click events you had binded to the li elements will not passed along. Finally, you are not giving any sort of href for those breadcrumbs to use.

Try something like this and put it on 4 pages with those links and the script file on each page

<div id="breadcrumb"></div>
<ul id="navigation_links">
    <li><a href="page1.html">Page 1</a></li>
    <li><a href="page2.html">Page 2</a></li>
    <li><a href="page3.html">Page 3</a></li>
    <li><a href="page4.html">Page 4</a></li>
</ul>

$(document).ready(function(){
    bindEventToNavigation();
    showBreadCrumb(); //Show the breadcrumb when you arrive on the new page
});

function bindEventToNavigation(){
    $.each($("#navigation_links > li > a"), function(index, element){
        $(element).click(function(event){
            breadcrumbStateSaver($(this).attr('href'), $(this).text());
            showBreadCrumb();
        });
    });
}

function breadcrumbStateSaver(link, text) {
    if (typeof (Storage) != "undefined") {
        if (sessionStorage.breadcrumb) {
            var breadcrumb = sessionStorage.breadcrumb;
            sessionStorage.breadcrumb = breadcrumb + " >> <a href='" + link + "'>" + text + "</a>";
        } else {
            sessionStorage.breadcrumb = "<a href='" + link + "'>" + text + "</a>";
        }
    }
}

This is only going to put links on pages after the first one. So alternatively you can use

$(document).ready(function () {
    breadcrumbStateSaver(document.title, document.location.href);
    showBreadCrumb();
});

at the top of each page and automatically add it to the breadcrumb instead of doing it on the click. If you need the clicks to run some other function/event you can use span/li/div tags with an id that you can bind an event to instead of just using anchors.

Finally, this will not stop there from being duplicates in the crumb, so you may want to consider storing the links & text in an array and build the crumbs from that.

来源：https://stackoverflow.com/questions/18998797/create-breadcrumbs-dynamically-on-client-side-using-javascript

标签

javascript

jquery

html5

query-string

breadcrumbs