A “suggest-as-you-type” search widget in 57 lines of JavaScript code.

A “suggest-as-you-type” search widget in 57 lines of JavaScript code.

<strong>A how-to for an effective search widget that shows suggestions as you type, in plain JavaScript, and using the Fetch API to GET content.</strong>

A how-to for an effective search widget that shows suggestions as you type, in plain JavaScript, and using the Fetch API to GET content.

While working on Influen$e, I wanted to make the search function a robust tool for people searching for an influencer’s Instagram.

Because discovery is a critical distinguishing feature of Influen$e, I also wanted to build in a simple recommendation function that targeted customers based on the relevance of influencers’ content to their core brand values.

In this article, I’ll share the code and walk you through how the function works.

If you know what you’re doing, you can jump to the code on GitHub.

The HTML

I’m using UI Kit 3 for my CSS framework, so this part is easy. Here’s the code:

<form id="SearchMemberForm">
    <div class="uk-margin-small">
        <div class="uk-inline uk-width-1-1">
            <button id="MemberSubmit" type="submit"
              class="uk-form-icon uk-form-icon-flip"
              uk-icon="icon: search"></button>
            <input id="MemberInput" type="search" name="ig_handle"
              class="member-search-input uk-input uk-form-large"
              placeholder="e.g., cristiano" autocapitalize="none"
              autocorrect="off" autocomplete="off" />
            <div id="PresetMember" class="uk-width-1-1 uk-margin-remove"
              uk-dropdown="mode: click; pos: bottom-justify;
              boundary: .member-search-input"></div>
        </div>
    </div>
</form>

Getting the data with Fetch API

The first thing we need to do is get an Array of objects to populate suggestions, right? So, we’ll make a request to an API or cloud function or whatever.

I’m using Fetch because all I need is a JSON object, but if you want more granular control you can use XHR just the same.

fetch('://<server>/api/', {
      method: "GET",
      cache: "no-cache",
      credentials: "same-origin",
      headers = {
          "Accept": "application/json",
          "Content-Type": "application/json; charset=utf-8",
          'X-Requested-With': 'XMLHttpRequest'
      };
  })
  .then(res => res.json())
  .then(json => {
      console.log(`JSON response ${json}`)
  })
.catch(error => console.log(error));

Fetch is pretty straightforward:

  • I send a GET request to my API endpoint at ://<server>/api/.
  • .then(res => res.json()) renders the response as JSON.
  • .then(json => {}) is where we can use that JSON.
  • .catch(error =>...); catches any errors in our request.
One thing to bear in mind, Fetch doesn’t do any error checking, it only returns a fail if something went wrong with the actual request to the server, like a 404 or 500. So, you’ll need to write your own error catching code.

If you run that code, you’ll get an array of objects. In my case it’s an Array of social media influencer objects:

Coding the UI

Now we need to turn that Array into a nice drop down list. There are two types of lists I’m going to generate.

  • One will be for automated recommendations when the user clicks the search field.
  • The other will be our suggest-as-you-type list.

To do that, we’ll pass our Array to a new function, called loadLists(). Let’s update our Fetch response to call loadLists(json):

fetch(endpoint, {
    method: "GET",
    cache: "no-cache",
    credentials: "same-origin",
    headers: headers,
})
.then(response => response.json())
.then(json => loadLists(json))  // <-- Call loadLists() here
.catch(error => console.log(error));

This passes our Array of member objects to a new function called loadLists() which looks like this:

let loadLists = (json) => {
    let members = [...json.members];
let searchSuggest = ['input', function(e) {
        filterList(event.target.value, members);
    }, false];

formInput.addEventListener(...searchSuggest);
presetMembers.innerHTML = userList(members.slice(0, 3));

}

There’s a couple of things going on here.

  • First, we’re using a spread operator [...json.members] to get to the objects in our array.
  • Next, we’re creating an Array called searchSuggest, and within calling the filterList() function.
  • Then, we add an event listener to the input field in our HTML form.
  • And finally, we’re loading the top three recommended influencers into the presetMembers drop down menu (I’ll get to that soon).

The reason we created the searchSuggest Array is because we want to pass the event and the function call to our event listener. It’s just a cleaner way of separating our functions.

Okay, let’s have a look at the filterList(); function.

let filterList = (key, members) => {
let listEl = document.getElementById('MemberList');
listEl.innerHTML = ''; // <-- Clear the field to avoid repeated entries.

for (let i = 0; i &lt; members.length; i++) {
    if ((members[i].ig_handle.toLowerCase())
        .indexOf(key.toLowerCase()) &gt; -1) {
        let node = () =&gt; (
            `&lt;li class="member-link"&gt;
                ${members[i].ig_handle}
            &lt;/li&gt;`
        );
        if (listEl.childNodes.length &lt; 5) {
            listEl.insertAdjacentHTML('beforeend', node());
        }
    }
    if (key.length &lt; 2) {
        listEl.innerHTML = '';
        presetMembers.innerHTML = userList(members.slice(0, 3));
    }
}

};

Wow, that’s the biggest chunk of code so far. Let’s walk through it.

First, we have a couple of arguments key and members.

So, the argument members is obviously our Array of members we got from our Fetch API call.

But what is key?

Remember when we created that Array called searchSuggest? Reminder, the event we added is

searchSuggest = ['input', function(e) {...

We’re adding an event listener for input, basically saying for every character the user types into our form field, trigger the input event. Get it? The input event is a keystroke, which is our key argument.

In other words, every time a user types a character into our search field, fire the filterList() function.

Next, we’re getting the MemberList element from our HTML. This is where we’ll generate our member list.

Let’s take a look at our for loop.

In this line we’re converting all text to lowercase so our searches will be case insensitive:

if ((members[i].ig_handle.toLowerCase()).indexOf(key.toLowerCase()) > -1)

Then for each character entered, we iterate through our members list and create a new list item node:

let node = () => (
&lt;li class="member-link"&gt; ${members[i].ig_handle} &lt;/li&gt;
);

${members[i].ig_handle} is how we’re identifying our members. In my case I’m looking them up by their Instagram username ig_handle.

Then we get up to five members and add them to our list using insertAdjacentHTML:

if (listEl.childNodes.length < 5) {
listEl.insertAdjacentHTML('beforeend', node());
}

And finally, if the user enters less than two characters — or backspaces to less than two characters — reload our presetMembers, hiding our suggestions:

if (key.length < 2) {
listEl.innerHTML = '';
presetMembers.innerHTML = userList(members.slice(0, 3));
}

Stitching it all together

Let get our elements using getElementById:

let formInput = document.getElementById('MemberInput')  // <-- form <input> field
let presetMembers = document.getElementById('PresetMember'); // <-- div for our list

Then we’re going to use template literals to generate our <ul> markup that we’re inserting into the presetmemberdiv.

let userListItem = (item) => (
&lt;li class="uk-width-1-1"&gt; &lt;img class="uk-border-circle uk-width-1-4 uk-float-left" src="${item.profile_pic}" data-uk-image /&gt; &lt;p class="uk-width-3-4 uk-text-lead uk-text-truncate uk-padding-small uk-padding-remove-vertical"&gt;${item.ig_handle}&lt;/p&gt; &lt;/li&gt;
);

let userList = (list) => (
&lt;ul id="MemberList" class="uk-list uk-list-divider uk-padding-remove-vertical"&gt; ${list.map(userListItem).join('')} &lt;/ul&gt;
);

There it is. Save the file and (hopefully) it should all work beautifully!

I hope this was helpful for you. Feel free to comment with questions, revelations, insults, etc.

Originally published by Michael Lisboa at https://medium.com

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JavaScript Tutorial: if-else Statement in JavaScript

JavaScript Tutorial: if-else Statement in JavaScript

This JavaScript tutorial is a step by step guide on JavaScript If Else Statements. Learn how to use If Else in javascript and also JavaScript If Else Statements. if-else Statement in JavaScript. JavaScript's conditional statements: if; if-else; nested-if; if-else-if. These statements allow you to control the flow of your program's execution based upon conditions known only during run time.

Decision Making in programming is similar to decision making in real life. In programming also we face some situations where we want a certain block of code to be executed when some condition is fulfilled.
A programming language uses control statements to control the flow of execution of the program based on certain conditions. These are used to cause the flow of execution to advance and branch based on changes to the state of a program.

JavaScript’s conditional statements:

  • if
  • if-else
  • nested-if
  • if-else-if

These statements allow you to control the flow of your program’s execution based upon conditions known only during run time.

  • if: if statement is the most simple decision making statement. It is used to decide whether a certain statement or block of statements will be executed or not i.e if a certain condition is true then a block of statement is executed otherwise not.
    Syntax:
if(condition) 
{
   // Statements to execute if
   // condition is true
}

Here, condition after evaluation will be either true or false. if statement accepts boolean values – if the value is true then it will execute the block of statements under it.
If we do not provide the curly braces ‘{‘ and ‘}’ after if( condition ) then by default if statement will consider the immediate one statement to be inside its block. For example,

if(condition)
   statement1;
   statement2;

// Here if the condition is true, if block 
// will consider only statement1 to be inside 
// its block.

Flow chart:

Example:

<script type = "text/javaScript"> 

// JavaScript program to illustrate If statement 

var i = 10; 

if (i > 15) 
document.write("10 is less than 15"); 

// This statement will be executed 
// as if considers one statement by default 
document.write("I am Not in if"); 

< /script> 

Output:

I am Not in if
  • if-else: The if statement alone tells us that if a condition is true it will execute a block of statements and if the condition is false it won’t. But what if we want to do something else if the condition is false. Here comes the else statement. We can use the else statement with if statement to execute a block of code when the condition is false.
    Syntax:
if (condition)
{
    // Executes this block if
    // condition is true
}
else
{
    // Executes this block if
    // condition is false
}


Example:

<script type = "text/javaScript"> 

// JavaScript program to illustrate If-else statement 

var i = 10; 

if (i < 15) 
document.write("10 is less than 15"); 
else
document.write("I am Not in if"); 

< /script> 

Output:

i is smaller than 15
  • nested-if A nested if is an if statement that is the target of another if or else. Nested if statements means an if statement inside an if statement. Yes, JavaScript allows us to nest if statements within if statements. i.e, we can place an if statement inside another if statement.
    Syntax:
if (condition1) 
{
   // Executes when condition1 is true
   if (condition2) 
   {
      // Executes when condition2 is true
   }
}

Example:

<script type = "text/javaScript"> 

// JavaScript program to illustrate nested-if statement 

var i = 10; 

if (i == 10) { 

// First if statement 
if (i < 15) 
	document.write("i is smaller than 15"); 

// Nested - if statement 
// Will only be executed if statement above 
// it is true 
if (i < 12) 
	document.write("i is smaller than 12 too"); 
else
	document.write("i is greater than 15"); 
} 
< /script> 

Output:

i is smaller than 15
i is smaller than 12 too
  • if-else-if ladder Here, a user can decide among multiple options.The if statements are executed from the top down. As soon as one of the conditions controlling the if is true, the statement associated with that if is executed, and the rest of the ladder is bypassed. If none of the conditions is true, then the final else statement will be executed.
if (condition)
    statement;
else if (condition)
    statement;
.
.
else
    statement;


Example:

<script type = "text/javaScript"> 
// JavaScript program to illustrate nested-if statement 

var i = 20; 

if (i == 10) 
document.wrte("i is 10"); 
else if (i == 15) 
document.wrte("i is 15"); 
else if (i == 20) 
document.wrte("i is 20"); 
else
document.wrte("i is not present"); 
< /script> 

Output:

i is 20

How to Retrieve full Profile of LinkedIn User using Javascript

How to Retrieve full Profile of LinkedIn User using Javascript

I am trying to retrieve the full profile (especially job history and educational qualifications) of a linkedin user via the Javascript (Fetch LinkedIn Data Using JavaScript)

Here we are fetching LinkedIn data like Username, Email and other fields using JavaScript SDK.

Here we have 2 workarounds.

  1. Configuration of linkedIn developer api
  2. Javascript Code to fetch records

Configuration of linkedIn developer api

In order to fetch records, first we need to create developer api in linkedin which will act as token/identity while fetching data from other linkedin accounts.

So to create api, navigate to https://linkedin.com/developer/apps and click on 'Create Application'.

After navigating, fill in details like name, description and other required fields and then submit.

As we submit, it will create Client ID and Client Secret shown below, which we will be using in our code while communicating to fetch records from other LinkedIn account.

Note: We need to provide localhost Url here under Oauth 2.0. I am using my localhost, but you can probably use other production URLs under Oauth 2.0 where your app is configured. It will make your api  consider the Url as trusted which fetching records.

Javascript Code to fetch records

For getting user details like first name, last name,User image can be written as,

<script type="text/javascript" src="https://platform.linkedin.com/in.js">  
    api_key: XXXXXXX //Client ID  
    onLoad: OnLinkedInFrameworkLoad //Method that will be called on page load  
    authorize: true  
</script>  
<script type="text/javascript">  
    function OnLinkedInFrameworkLoad() {  
        IN.Event.on(IN, "auth", OnLinkedInAuth);  
    }  
  
    function OnLinkedInAuth() {  
        IN.API.Profile("me").result(ShowProfileData);  
    }  
  
    function ShowProfileData(profiles) {  
        var member = profiles.values[0];  
        var id = member.id;  
        var firstName = member.firstName;  
        var lastName = member.lastName;  
        var photo = member.pictureUrl;  
        var headline = member.headline;  
        //use information captured above  
        var stringToBind = "<p>First Name: " + firstName + " <p/><p> Last Name: " + lastName + "<p/><p>User ID: " + id + " and Head Line Provided: " + headline + "<p/>"  
        document.getElementById('profiles').innerHTML = stringToBind;  
    }  
</script>    

Kindly note we need to include 'https://platform.linkedin.com/in.js' as src under script type as it will act on this Javascript SDK provided by Linkedin.

In the same way we can also fetch records of any organization with the companyid as keyword.

<head>  
    <script type="text/javascript" src="https://platform.linkedin.com/in.js">  
        api_key: XXXXXXX ////Client ID  
        onLoad: onLinkedInLoad  
        authorize: true  
    </script>  
</head>  
  
<body>  
    <div id="displayUpdates"></div>  
    <script type="text/javascript">  
        function onLinkedInLoad() {  
            IN.Event.on(IN, "auth", onLinkedInAuth);  
            console.log("On auth");  
        }  
  
        function onLinkedInAuth() {  
            var cpnyID = XXXXX; //the Company ID for which we want updates  
            IN.API.Raw("/companies/" + cpnyID + "/updates?event-type=status-update&start=0&count=10&format=json").result(displayCompanyUpdates);  
            console.log("After auth");  
        }  
  
        function displayCompanyUpdates(result) {  
            var div = document.getElementById("displayUpdates");  
            var el = "<ul>";  
            var resValues = result.values;  
            for (var i in resValues) {  
                var share = resValues[i].updateContent.companyStatusUpdate.share;  
                var isContent = share.content;  
                var isTitled = isContent,  
                    isLinked = isContent,  
                    isDescription = isContent,  
                    isThumbnail = isContent,  
                    isComment = isContent;  
                if (isTitled) {  
                    var title = isContent.title;  
                } else {  
                    var title = "News headline";  
                }  
                var comment = share.comment;  
                if (isLinked) {  
                    var link = isContent.shortenedUrl;  
                } else {  
                    var link = "#";  
                }  
                if (isDescription) {  
                    var description = isContent.description;  
                } else {  
                    var description = "No description";  
                }  
                /* 
                if (isThumbnailz) { 
                var thumbnailUrl = isContent.thumbnailUrl; 
                } else { 
                var thumbnailUrl = "http://placehold.it/60x60"; 
                } 
                */  
                if (share) {  
                    var content = "<a target='_blank' href=" + link + ">" + comment + "</a><br>";  
                    //el += "<li><img src='" + thumbnailUrl + "' alt=''>" + content + "</li>";  
                    el += "<li><div>" + content + "</div></li>";  
                }  
                console.log(share);  
            }  
            el += "</ul>";  
            document.getElementById("displayUpdates").innerHTML = el;  
        }  
    </script>  
</body>  

We can get multiple metadata while fetching records for any any organization. We can get company updates as shown below.

Conclusion

We can also fetch any company specific data like company job updates/post, total likes, comments, and number of views along with a lot of metadata we can fetch which I have shown below.

Thank you for reading !

7 Best Javascript Iframe Libraries

7 Best Javascript Iframe Libraries

Iframes let you build user experiences into embeddable ‘cross-domain components’, which let users interact with other sites without being redirected. I have compiled 7 best Javascript iframe libraries.

Iframes let you build user experiences into embeddable ‘cross-domain components’, which let users interact with other sites without being redirected. I have compiled 7 best Javascript iframe libraries.

1. Zoid

A cross-domain component toolkit, supporting:

  • Render an iframe or popup on a different domain, and pass down props, including objects and functions
  • Call callbacks natively from the child window without worrying about post-messaging or cross-domain restrictions
  • Create and expose components to share functionality from your site to others!
  • Render your component directly as a React, Vue or Angular component!
    It's 'data-down, actions up' style components, but 100% cross-domain using iframes and popups!

Download


2. Postmate

Postmate is a promise-based API built on postMessage. It allows a parent page to speak with a child iFrame across origins with minimal effort.

Download


3. Iframe Resizer

Keep same and cross domain iFrames sized to their content with support for window/content resizing, in page links, nesting and multiple iFrames

Demo

Download


4. Iframely

Embed proxy. Supports over 1800 domains via custom parsers, oEmbed, Twitter Cards and Open Graph

Demo

Download


5. React Frame component

This component allows you to encapsulate your entire React application or per component in an iFrame.

Demo

Download


6. Seamless.js

A seamless iframe makes it so that visitors are unable to distinguish between content within the iframe and content beside the iframe. Seamless.js is a JavaScript library (with no dependencies) that makes working with iframes easy by doing all the seamless stuff for you automatically.

Demo

Download


7. Porthole

A proxy to safely communicate to cross-domain iframes in javascript

Demo

Download


Thank for read!