Why is index never == 0?

Why is index never == 0? - javascript

<script>
var index = 0;
$.getJSON("./data/data.json", function(json) {
$.each(json, function(data) {
var html = "";
if(index == 0)
{
console.log(index + " first item");
html = "<div class='item active'>";
} else {
console.log(index + " its not 0");
html = "<div class='item'>"
}
console.log(json.length); // this will show the info it in firebug console
html += "<blockquote><div class='row'><div class='col-sm-3 text-center'><img class='img-circle' src='images/obama.jpg' style='width: 100px;height:100px;'></div><div class='col-sm-9'><p>Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are the change that we seek.</p><small>President Barack Obama</small></div></div></blockquote></div>";
$('body').append(html);
index++;
});
});
</script>
I need to generate 5 of these but the first one needs to be have 'item active'
If there is a better way, please let me know
Thank you for pointing out that my html was being overwritten. I updated my code but jQuery isn't actually placing my HTML into the body. so thats another question

You can add an index into the $.each method; this will span from 0 to data.length - 1
$.getJSON("./data/data.json", function(json) {
$.each(json, function(index, data) {
var html = "";
html += '<div class="item' + (index == 0 ? ' active' : '') + '">';
html += '<blockquote>...</blockquote>';
html += '</div>';
$('body').append(html);
});
});

<script>
var index = 0;
$.getJSON("./data/data.json", function(json) {
$.each(json, function(data) {
var html = "";
if(index == 0)
html = "<div class='item active'>";
else
html = "<div class='item'>";
html += "<blockquote><div class='row'><div class='col-sm-3 text-center'><img class='img-circle' src='images/obama.jpg' style='width: 100px;height:100px;'></div><div class='col-sm-9'><p>Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are the change that we seek.</p><small>President Barack Obama</small></div></div></blockquote></div>";
$('body').append(html);
index++;
});
});
</script>

Related

fix variable increment in javascript

I'm coding a wordpress theme and I want to increment a load more button.
I'm not using wordpress always and this is the first time I've this problem with a javascript variable. The variable pull_page in fact will not increment and every time the script will run it will fetch only two pages. Is there any error in the code, and how I can fix it?
$('#load-more').on('click', function(e){
e.preventDefault();
var pull_page = 1;
var jsonFlag = true;
if(jsonFlag){
pull_page++;
$.getJSON("/beta/wp-json/portfolio/all-posts?page=" + pull_page, function(data){
if(data.length){
$.each(data, function(i, item){
var html = '<div class="card">';
html += '<a href="'+ item.permalink +'">';
html += '<img class="card-img-top w-100" src="'+ item.featured_img_src +'" id="case-studies" />';
html += '<div class="overlay"><h4 class="text-center" id="client-name">'+ item.title +'</h4></div>';
html += '</a>';
html += '</div>';
$('body').find('.card-columns')
.append(html);
});
}
else{
jsonFlag = false;
}
}).done(function(data){
if(data.length >= 4){
jsonFlag = true;
}
else{
jsonFlag = false;
}
});
}
}); // end load more

You're resetting pull_page to 1 each and every time the load more button is clicked.
Move it outside.
var pull_page = 1;
$('#load-more').on('click', function(e) {
...

Backbone.js - Solving method

BACKBONE and Jquery
I have a piece of code:
var ChatMessage = Backbone.View.extend({
el : '#friend-list',
events : {},
initialize : function() {},
loadMessage : function(parent_id) {
//ukrycie komunikatów etc.
$("#chat_body").html('');
$("#end-record-info").hide();
$("#end-record-load").hide();
page = 1;
this.ajax(parent_id,page); //initial data load
},
ajax : function(parent_id,page) {
$.getJSON( "/**/**/"+parent_id+"/"+page, function( json ) {
$("#end-record-load").hide();
this.build(json.message, page);
page ++; //page increment
loading = false; //set loading flag off
end_record = false;
if(json.max < page){ //no more records
end_record = true; //set end record flag on
return; //exit
}
});
},
build : function(arr, page) {
alert('dgd');
html = '';
var height = 0;
arr.reverse();
$.each(arr, function(i, data){
html += '<div class="answer '+data.side+'">';
html += '<div class="avatar">';
html += '<a href="**" target="_blank">';
html += ''+data.id+'';
html += '</a>';
html += '<div class="status offline"></div>';
html += '</div>';
html += '<div class="name">';
html += '<a href="**" target="_blank">';
html += data.username;
html += '</a>';
html += '</div>';
html += '<div class="text">';
html += data.content;
html += '</div>';
html += '<div class="time">';
if (data.side != 'left') {
html += data.dateSendMessage
}
else {
if (data.read == 0) {
html += 'xxx';
}
else {
html += 'xxx';
}
}
html += '</div>';
html += '</div>';
});
var nh = $('#chat_body').html();
$('#chat_body').html(html+nh);
if (page == 1) {
$('#chat_body .answer').each(function(i, value){
height += parseInt($(this).height());
});
height += '';
$('.chat2').scrollTop(height);
}
}
});
In AJAX method I want to build method
this.build(json.message, page);
But something does not work and I get an error.
pm2.js:67TypeError: this.build is not a function. (In 'this.build(json.message, page)', 'this.build' is undefined)
Can anyone help? What changes in this piece of code can be by the way?
Piotr

You should probably save current context before calling getJSON:
ajax : function(parent_id,page) {
var self = this;
$.getJSON( "/**/**/"+parent_id+"/"+page, function( json ) {
...
self.build(json.message, page);

Try to figure out how to show content based on window.location.hash

Im using JSON and passing data through the href tag and using a click event to show specific items from a product database. My question is that I have code in the script that assigns a unique window hash to each product. It takes the product name and strips the spaces.
How can I show the correct item on the page if the hash tag matches the item when linking from an external url?
For example, when one of the items is clicked on the page the url will show something like www.website.com#CherryTomatoes.
Obviously I cant link to this from another website because the hash only exists when the click event is fired. I want to be able to automatically show the correct item when using an external link. Below is my code hope someone can help me out with this!
//display product category based on click
$("#displayall").click(function(event){
displayAll();
});
//display all products function
function displayAll() {
var categoryImage = '';
$.each(json, function (i, item) {
categoryImage += '<div class="col-lg-3 col-md-4 col-sm-6 col-xs-12">' + '' + '<img class="img-responsive img-hover productImagesCategory" src="' + item.imageURL + '">' + '<h3>' + item.itemName + '</h3>' + '' + '</div>';
});
$('#imagesCategoryProducts').hide().html(categoryImage).fadeIn('slow');
//show individual product function on click
$(".showProduct").click(function(event){
//hide all current products
$('#productCategories').hide();
//get passed data from other function
var clickedItemName = '<h1>' + $(this).data('itemname') + '</h1>';
var clickedItemUPC = $(this).data('itemupc');
var clickedItemOZ = '<h2>' + $(this).data('itemoz') + '</h2>';
var clickedItemDescription = '<p>' + $(this).data('itemdescription') + '</p>';
var clickedItemImage = '<img class="img-responsive img-rounded center-block" src="' + $(this).data('itemimage') + '">';
var clickedItemGluten = $(this).data('itemgluten');
var clickedItemBPA = $(this).data('itembpa');
var clickedItemGMO = $(this).data('itemgmo');
var clickedItemPageURL = $(this).data('itempageurl');
//check if clicked data equals correct item
$.each(json, function (i, item) {
if (item.itemName === clickedItemName) {
clickedItemName
}
if (item.itemFullUPC === clickedItemUPC) {
clickedItemUPC
}
if (item.itemPackSize === clickedItemOZ) {
clickedItemOZ
}
if (item.itemDescription === clickedItemDescription) {
clickedItemDescription
}
if (item.imageURL === clickedItemImage) {
clickedItemImage
}
if (item.itemGlutenFree === clickedItemGluten) {
clickedItemGluten
}
if (item.itemBPAFree === clickedItemBPA) {
clickedItemBPA
}
if (item.itemGMOFree === clickedItemGMO) {
clickedItemGMO
}
//assign window hash to each product
if (item.itemName === clickedItemPageURL) {
event.preventDefault();
clickedItemPageURL = clickedItemPageURL.replace(/\s/g, '');
window.location.hash = clickedItemPageURL;
}
});
//remove extra characters from UPC
var originalUPC = clickedItemUPC;
var strippedUPC = '<h2>' + originalUPC.slice(1, -1); + '</h2>';
//show individual product information
$('#productSocialShare').show();
$('#individualProduct').show();
$('#relatedProducts').show();
//append product information to appropriate DIV
$('#productTitle').html(clickedItemName);
$('#productUPC').html(strippedUPC);
$('#productOZ').html(clickedItemOZ);
$('#productDescription').html(clickedItemDescription);
$('#productImage').html(clickedItemImage);
//check if gluten free is true and show image
if (clickedItemGluten == "Y") {
clickedItemGluten = '<img class="img-responsive img-rounded img-margin" src="../images/misc/gluten_free_test.jpg">';
$('#productGlutenFree').html(clickedItemGluten);
$('#productGlutenFree').show();
} else {
$('#productGlutenFree').hide();
}
//check if bpa free is true and show image
if (clickedItemBPA == "Y") {
clickedItemBPA = '<img class="img-responsive img-rounded img-margin" src="../images/misc/bpa_free_test.jpg">';
$('#productBPAFree').html(clickedItemBPA);
$('#productBPAFree').show();
} else {
$('#productBPAFree').hide();
}
//check if gmo free is true and show image
if (clickedItemGMO == "Y") {
clickedItemGMO = '<img class="img-responsive img-rounded img-margin" src="../images/misc/gmo_test.jpg">';
$('#productGMOFree').html(clickedItemGMO);
$('#productGMOFree').show();
} else {
$('#productGMOFree').hide();
}
});
closeNav();
}

Trying to alter this JSON search so that it only searches when a submit button is pressed

New on here and a beginner at code. I have this code I am using as a Karaoke search. However, the JSON contains about 40 000 lines of info, and the search is set up to tigger on keyup, so it is very laggy sometimes. I'm hoping someone can help me alter this code so that it only searches when a submit button is pressed... Any ideas? Greatly Appreciated
$(window).load(function(){
$('#search').keyup(function(){
var searchField = $('#search').val();
var regex = new RegExp(searchField, "i");
var output = '<div class="row">';
var count = 1;
$.getJSON('data.json', function(data) {
$.each(data, function(key, val){
if ((val.name.search(regex) != -1) || (val.location.search(regex) != -1)) {
//output += '<div class="col-md-6 well">';
//output += '<div class="col-md-7">';
output += '' + val.name + ' - ';
output += '' + val.location + '';
output += '</div>';
output += '</div>';
output += '<div class="col-md-7"><img class="img-responsive" src="send.png" /></div>';
if(count%2 == 0){
output += '</div><div class="row">'
}
count++;
}
});
output += '</div>';
$('#results').html(output);
});
});
});

Assuming you placed your submit button within a form, give your form an ID.
<form id="search-form">
Change line
$('#search').keyup(function(){
to
$('#search-form').on('submit', function (e) {
e.preventDefault();

The search logic should not be implemented on the client side. It would be painful for the browser to do that kind of iteration. Transfer your search logic in the backend. : )
if you're going to fixed that on front end, please add timeout/debounce during keyup
var delay = null;
$( el ).keyup( function () {
if ( delay ) clearTimeout( delay );
var delay = setTimeout( function () {
// your search logic
} );
} );

.replacewith not working when called a second time

I have the following markup:
<fieldset>
<legend>Headline Events...</legend>
<div style="width:100%; margin-top:10px;">
<div style="width:100%; float:none;" class="clear-fix">
<div style="width:400px; float:left; margin-bottom:8px;">
<div style="width:150px; float:left; text-align:right; padding-top:7px;">
Team Filter:
</div>
<div style="width:250px; float:left;">
<input id="teamFilter" style="width: 100%" />
</div>
</div>
<div style="width:400px; float:left; margin-bottom:8px;">
<div style="width:150px; float:left; text-align:right; padding-top:7px;">
Type Filter:
</div>
<div style="width:250px; float:left;">
<input id="typeFilter" style="width: 100%" />
</div>
</div>
</div>
</div>
<div id="diaryTable" name="diaryTable" class="clear-fix">
Getting latest Headlines...
</div>
</fieldset>
I also have the following scripts
<script>
function teamFilterChange(e) {
//alert(this.value());
setCookie('c_team', this.value(), 90);
$c1 = getCookie('c_team');
$c2 = getCookie('c_type');
var param = "true|" + $c1 + "|" + $c2;
outputHLDiaryEntries(param);
}
function typeFilterChange(e) {
//alert(this.value());
setCookie('c_type', this.value(), 90);
$c1 = getCookie('c_team');
$c2 = getCookie('c_type');
var param = "true|" + $c1 + "|" + $c2;
outputHLDiaryEntries(param);
}
// This optional function html-encodes messages for display in the page.
function htmlEncode(value) {
var encodedValue = $('<div />').text(value).html();
return encodedValue;
}
function outputHLDiaryEntries(param) {
var url = "Home/DiaryEntries/";
var data = "id=" + param;
$.post(url, data, function (json) {
var n = json.length;
alert(n + ' ' + json);
if(n == 0){
//json is 0 length this happens when there were no errors and there were no results
$('#diaryTable').replaceWith("<span style='color:#e00;'><strong>Sorry: </strong> There are no headline events found. Check your filters.</span>");
} else {
//json has a length so it may be results or an error message
//if jsom[0].dID is undefined then this mean that json contains the error message from an exception
if (typeof json[0].dID != 'undefined') {
//json[0].dDI has a value so we
//output the json formatted results
var out = "";
var i;
var a = "N" //used to change the class for Normal and Alternate rows
for (i = 0; i < json.length; i++) {
out += '<div class="dOuter' + a + '">';
out += '<div class="dInner">' + json[i].dDate + '</div>';
out += '<div class="dInner">' + json[i].dRef + '</div>';
out += '<div class="dInner">' + json[i].dTeam + '</div>';
out += '<div class="dInner">' + json[i].dCreatedBy + '</div>';
out += '<div class="dType ' + json[i].dType + '">' + json[i].dType + '</div>';
out += '<div class="dServer">' + json[i].dServer + '</div>';
out += '<div class="dComment">' + htmlEncode(json[i].dComment) + '</div></div>';
//toggle for normal - alternate rows
if (a == "N") {
a = "A";
} else {
a = "N";
}
}
//output our formated data to the diaryTable div
$('#diaryTable').replaceWith(out);
} else {
//error so output json string
$('#diaryTable').replaceWith(json);
}
}
}, 'json');
}
$(document).ready(function () {
//Set User Preferences
//First check cookies and if null or empty set to default values
var $c1 = getCookie('c_team');
if ($c1 == "") {
//team cookie does not exists or has expired
setCookie('c_team', 'ALL', 90);
$c1 = "ALL";
}
var $c2 = getCookie('c_type');
if ($c2 == "") {
//type cookie does not exists or has expired
setCookie('c_type', "ALL", 90);
$c2 = "ALL";
}
// create DropDownList from input HTML element
//teamFilter
$("#teamFilter").kendoDropDownList({
dataTextField: "SupportTeamText",
dataValueField: "SupportTeamValue",
dataSource: {
transport: {
read: {
dataType: "json",
url: "Home/SupportTeams?i=1",
}
}
}
});
var teamFilter = $("#teamFilter").data("kendoDropDownList");
teamFilter.bind("change", teamFilterChange);
teamFilter.value($c1);
//typeFilter
$("#typeFilter").kendoDropDownList({
dataTextField: "dTypeText",
dataValueField: "dTypeValue",
dataSource: {
transport: {
read: {
dataType: "json",
url: "Home/DiaryTypes?i=1",
}
}
}
});
var typeFilter = $("#typeFilter").data("kendoDropDownList");
typeFilter.bind("change", typeFilterChange);
typeFilter.value($c2);
// Save the reference to the SignalR hub
var dHub = $.connection.DiaryHub;
// Invoke the function to be called back from the server
// when changes are detected
// Create a function that the hub can call back to display new diary HiLights.
dHub.client.addNewDiaryHiLiteToPage = function (name, message) {
// Add the message to the page.
$('#discussion').append('<li><strong>' + htmlEncode(name)
+ '</strong>: ' + htmlEncode(message) + '</li>');
};
// Start the SignalR client-side listener
$.connection.hub.start().done(function () {
// Do here any initialization work you may need
var param = "true|" + $c1 + "|" + $c2;
outputHLDiaryEntries(param)
});
});
</script>
On initial page load the outputHLDiaryEntries function is called when the signalR hub is started. If I then change any of the dropdownlists this calls the outputHLDiaryEntries but the $('#diaryTable').replaceWith(); does not work. If I refresh the page the correct data is displayed.
UPDATE!
Based on A.Wolff's comments I fixed the issue by wrapping the content I needed with the same element I was replacing... by adding the following line at the beginning of the outputHLDiartEntries function...
var outStart = '<div id="diaryTable" name="diaryTable" class="clear-fix">';
var outEnd = '</div>';
and then changing each of the replaceWith so that they included the wrappers e.g.
$('#diaryTable').replaceWith(outStart + out + outEnd);

replaceWith() replaces element itself, so then on any next call to $('#diaryTable') will return empty matched set.
You best bet is to replace element's content instead, e.g:
$('#diaryTable').html("<span>New content</span>");

I had the same problem with replaceWith() not working when called a second time.
This answer helped me figure out what I was doing wrong.
The change I made was assigning the same id to the new table I was creating.
Then when I would call my update function again, it would create a new table, assign it the same id, grab the previous table by the id, and replace it.
let newTable = document.createElement('table');
newTable.id = "sameId";
//do the work to create the table here
let oldTable = document.getElementById('sameId');
oldTable.replaceWith(newTable);

Develop Reference

JavaScript is the programming language of the Web.

Why is index never == 0? - javascript

Related

fix variable increment in javascript

Backbone.js - Solving method

Try to figure out how to show content based on window.location.hash

Trying to alter this JSON search so that it only searches when a submit button is pressed

.replacewith not working when called a second time

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