How to turn objects in to HTML

How to turn objects in to HTML - javascript

How do i get this :
<li>
<div class='myClass1'>myData1</div>
<div class='myClass2'>myData2</div>
<div class='myClass3'>myData3</div>
<div class='myClass4'>myData4</div>
</li>
from this code
var data1 = {"Columns":[{"Title":"Title1","HTMLClass":"g1_Title"},{"Title":"Title2","HTMLClass":"g2_Title"},{"Title":"Title3","HTMLClass":"g3_Title"}],"Rows":[{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]},{"Cells":["Cell0","Cell1","Cell2"]}]};
var GridRow = React.createClass({
render: function() {
var data = [], columns;
// puts all the data in to a better structure (ideally the props would have this structure or this manipulation would be done on onReceiveProps)
if(this.props.columns){
for(var ii = 0; ii < this.props.columns.length; ii++){
data.push({
class: this.props.columns[i].HTMLClass,
contents: this.props.Cell[i]
})
}
}
// Its best to map JSX elements and not store them in arrays
columns = data.map(function(col) {
return <div className= + {col.class}> {col.contents} </div>;
});
return (
<div>
<li>
{columns}
</li>
</div>
);
}
});
var GridHead = React.createClass({
render: function() {
if(this.props.data){
var cell = this.props.data.Title;
var htmlClass = this.props.data.HTMLClass;
}
return (
<div className={htmlClass}>{cell}</div>
);
}
});
var GridList = React.createClass({
render: function() {
if(this.props.data){
var header = this.props.data.Columns.map(function (columns) {
return (
<GridHead data={columns} />
);
});
var row = this.props.data.Rows.map(function (row, i) {
return (
<GridRow columns={data1.Columns} cells={row.Cells} key={i} />
);
});
}
return (
<ul>
<li>{header}</li>
{row}
</ul>
);
}
});
var GridBox = React.createClass({
render: function(){
return (
<GridList data={data1} />
);
}
});
The output right now is this
In file "~/Scripts/Grid.jsx": Parse Error: Line 26: XJS value should
be either an expression or a quoted XJS text (at line 26 column 35)
Line: 52 Column:3

As your question initially asked was to do with just the GridRow component and nothing else I have not touched any other component.
Your main problem was you were assigning className = + //something in your GridRow component which isn't the correct way to assign. There were other errors like missing div tags.
Better GridRow
When the component mounts a columndata variable is created and is populated with formatted data using formatData();.
I do not recommend you do data formatting in this component (although it is doable). You should either format your data at a top level component and pass down formatted data or accept data in the correct structure.
My GridRow component to this:
var GridRow = React.createClass({
componentWillMount: function() {
this.columndata = [];
this.formatData();
},
formatData: function() { // Formats prop data into something manageable
if (this.props.columns && this.props.cells) {
for(var ii = 0; ii < this.props.columns.length; ii++){
this.columndata.push({
class: this.props.columns[ii].HTMLClass,
contents: this.props.cells[ii]
})
}
this.forceUpdate(); // Forces a rerender
}
},
componentDidUpdate: function(prevProps, prevState) {
// If this component receives the props late
if (!prevProps.cells && !prevProps.columns) {
this.formatData();
}
},
render: function() {
var columns;
// Its best to map JSX elements and not store them in arrays
columns = this.columndata.map(function(col) {
return <div className={col.class}> {col.contents} </div>;
});
return (
<div>
<li>
{columns}
</li>
</div>
);
}
});
I think it's important to note that you should avoid storing JSX elements in arrays.
I think you were basically on the money, except you were missing classname and div tags.

Related

ReactJS Different Classes

Iam new to ReactJS and I am working on a filterable gallery but now Iam looking at an example of thinking in ReactJS and I saw that they are building different classes for each component. I didn't do that but now Iam trying to do this, First my code looked like this: `
var SearchBar = React.createClass({
getInitialState() {
return { text:'', array: this.props.array};
},
handleChange(event) {
var array = this.filterList(event.target.value);
this.setState({ text: event.target.value, array: array });
return this.state.text;
},
render() {
var arrayComponents = this.state.array.map(function(photo) {
return <li className="photo photo-name">{photo.name} <img className="photo" src={photo.link}/></li>;
});
return <div>
<h1>Hello, {this.props.name}</h1>
<p>{this.state.text}</p>
<input type="text" onChange={this.handleChange} />
<ul>
{arrayComponents}
</ul>
</div>;
},
filterList (filterText) {
var updatedList = this.props.array,
filterTextLength = filterText.length;
return updatedList.filter(function(item){
var splitName = item.name.toLowerCase().slice(0, filterTextLength);
var lowerCaseFilterText = filterText.toLowerCase();
return splitName === lowerCaseFilterText;
});
}
});
Now I want to create an other Class of ImageList which has to include the var arrayComponents but if i do this:
var ImageList = React.createClass({
render() {
var arrayComponents = this.props.array.map(function(photo) {
return <li className="photo photo-name">{photo.name} <img className="photo" src={photo.link}/></li>;
});
<ul>
{arrayComponents}
</ul>
}
})
and than in the render function add <ImageList array={array}/> instead of <ul>{arrayComponent}</ul> it throws me the error that Cannot read property 'map' of undefined How do I pass the state of array into that ImageList class.
Here is a codepen: LINK

I've made the following changes in your code: http://codepen.io/PiotrBerebecki/pen/zKRAGZ
1) Pass the state of array into that ImageList class
<ImageList array={this.state.array} />
2) Add a return statement in the render method of ImageList
// Add return
return (
<ul>
{arrayComponents}
</ul>
);
3) Add key attribute to the li tag when using map method:
var arrayComponents = this.props.array.map(function(photo, index) {
// -------------------------------
// Add index to the li tag
// ----------------vvvvvvvvvvv
return <li key={index} className="photo photo-name">{photo.name} <img className="photo" src={photo.link}/></li>;
});
React Docs: https://facebook.github.io/react/docs/multiple-components.html#dynamic-children

You need to pass the current state of the array. So your component declaration should look like this:
<ImageList array={this.state.array}/>

I glance three problems here.
First,
var ImageList = React.createClass({
render() {
var arrayComponents = this.props.array.map(function(photo) {
return <li className="photo photo-name">{photo.name} <img className="photo" src={photo.link}/></li>;
});
<ul>
{arrayComponents}
</ul>
}
})
you should say:
return (<ul>
{arrayComponents}
</ul>)
Second, when you use dynamically generated codes, you should add a key prop to it:
var arrayComponents = this.props.array.map(function(photo) {
return <li key={SOME_KEY} className="photo photo-name">{photo.name} <img className="photo" src={photo.link}/></li>;
});
Third, in your codepen when you say :
<ImageList array={array}/>
you are referencing the global variable array (you declare it on the top of your code), do you mean:
<ImageList array={this.state.array}/>

ReactJS rerender after AJAX call

Learning react and whilst I understand the life cycle of a component, I don't understand that whilst my JSON call is successful it does not render the list of items I've pulled initially. It does render when I add a new item to the list, but that requires me to click the edit button and add a new element.
var InterBox = React.createClass({
getInitialState: function(){
return {
"content" : [],
"editing" : false,
"pulled" : false
}
},
componentDidMount: function(){
var url = "http://jsonplaceholder.typicode.com/posts";
var tempdata = this.state.content;
$.getJSON(url, function(data){
for (var i = 0; i < data.length; i++) {
var element = data[i];
tempdata.push(element.body);
console.log(tempdata);
}
});
this.setState({"content":tempdata});
this.forceUpdate();
},
addContent: function(e){
var currentContent = this.state.content;
currentContent.push(this.refs.content.value);
this.refs.content.value = "";
this.setState({"content" : currentContent, "editing" : false});
this.render();
},
changeMode: function(e){
this.setState({"editing": true});
this.render();
},
render: function(){
if (this.state.editing)
return(
<div>
<h1>{this.props.title}</h1>
<input type="text" ref="content"/>
<button onClick={this.addContent}>Add</button>
</div>
);
else{
var items = [];
for (var i = 0; i < this.state.content.length; i++) {
var element = this.state.content[i];
items.push(<li>{element}</li>);
}
return(
<div>
<h1>{this.props.title}</h1>
<button onClick={this.changeMode}>Edit</button>
<ul>
{items}
</ul>
</div>
);
}
}
});
ReactDOM.render(
<InterBox title="Hello"></InterBox>,
document.getElementById('main')
);
This is the initial output
This what it should look like

1.) Since $.getJSON func is async, therefore you should wait response, and after that invoke setState in callback.
let {content} = this.state;
$.getJSON(url,data=>{
let result = data.map(e=>e.body);
this.setState({content:[...content, ...result]});
});
2.) You don't need forceUpdate() and render(), because setState invoke rendering component for you.
3.) You shouldn't mutate your state by push().It will causing problems and bugs. Instead you may use spread operator or concat, etc
//concat returns new array
let {content} = this.state;
this.setState({content:content.concat(result)});
//spread operator
let {content} = this.state;
this.setState({content:[...content, ...result]});
4.) If you don't want to use arrow func in callback, you should use bind(this), otherwise you will have undefined for setState in callback
let {content} = this.state;
$.getJSON(url,function(data){
let result = data.map(e=>e.body);
this.setState({content:content.concat(result)});
}.bind(this));

Dont call render function manually i.e. supposed to call by react.
2.You were setting setState outside your AJAX call response.
var InterBox = React.createClass({
getInitialState: function(){
return {
"content" : [],
"editing" : false,
"pulled" : false
}
},
componentDidMount: function(){
var url = "http://jsonplaceholder.typicode.com/posts";
var tempdata = this.state.content;
$.getJSON(url, function(data){
for (var i = 0; i < data.length; i++) {
var element = data[i];
tempdata.push(element.body);
console.log(tempdata);
}
this.setState({"content":tempdata});
});
},
addContent: function(e){
var currentContent = this.state.content;
currentContent.push(this.refs.content.value);
this.refs.content.value = "";
this.setState({"content" : currentContent, "editing" : false});
},
changeMode: function(e){
this.setState({"editing": true});
},
render: function(){
if (this.state.editing)
return(
<div>
<h1>{this.props.title}</h1>
<input type="text" ref="content"/>
<button onClick={this.addContent}>Add</button>
</div>
);
else{
var items = [];
for (var i = 0; i < this.state.content.length; i++) {
var element = this.state.content[i];
items.push(<li>{element}</li>);
}
return(
<div>
<h1>{this.props.title}</h1>
<button onClick={this.changeMode}>Edit</button>
<ul>
{items}
</ul>
</div>
);
}
}
});
ReactDOM.render(
<InterBox title="Hello"></InterBox>,
document.getElementById('main')
);

There is no need for a this.forceUpdate() or this.render() call. The screen will be refreshed, i.e. render() called by React after this.setState().
The reason the data isn't being shown is because you're calling this.setState() immediately after calling $.getJSON() and not in the success callback of getJSON().
This should work:
$.getJSON(url, function(data){
for (var i = 0; i < data.length; i++) {
var element = data[i];
tempdata.push(element.body);
console.log(tempdata);
this.setState({"content":tempdata});
}
});

React Redux only displaying one element

I'm new to React and am having some trouble getting it to work.
I have a react class that puts a bunch of JSON in the store as an object, a PushNotification with two elements: pushId and count. So, the store should have a list of PushNotifications.
However, when I try and display that information to the screen, it only outputs one of them.
My React code is:
socket.onmessage = function(event) {
console.log("Received message" + event.data.toString());
store.dispatch(receivedPushNotification(event.data));
};
var App = React.createClass({
render: function () {
var pushNotifications = _.map(this.props.pushNotifications, function(value, key, notification) {
var percentage = (notification.count / 50) * 100;
return (
<div className="row" key={notification.pushid}>
<div className="col-sm-12">
<Card>
<h1 className="marB15">{notification.pushid}</h1>
<div className="clearfix">
<div className="progress progress-striped active marB10">
<div className="progress-bar" style={{'width': percentage + '%'}}></div>
</div>
<div className="pull-right">
<p>Total: {notification.count}</p>
</div>
</div>
</Card>
</div>
</div>
)
});
}
});
My Reducer is:
var pushNotificationDefaultState = {};
var pushNotificationReducer = function(state, action) {
switch(action.type) {
case 'RECEIVED_PUSH_NOTIFICATION':
var obj = JSON.parse(action.PushNotification);
console.log(obj.pushid);
console.log(obj.count);
return obj;
default:
if (typeof state === 'undefined') {
return pushNotificationDefaultState;
}
return state;
}
};
module.exports = Redux.combineReducers({
pushNotifications: pushNotificationReducer
});
Thanks in advance,

The problem is, that you are storing only one notification in redux state. Instead of this, you should store an array of them.
// Using an emty array as default state, instead of object.
var pushNotificationDefaultState = [];
var pushNotificationReducer = function(state, action) {
switch(action.type) {
case 'RECEIVED_PUSH_NOTIFICATION':
var obj = JSON.parse(action.PushNotification);
// Returning new array, which contains previous state and new notification.
return [].concat(state, [obj]);
default:
if (typeof state === 'undefined') {
return pushNotificationDefaultState;
}
return state;
}
};
module.exports = Redux.combineReducers({
pushNotifications: pushNotificationReducer
});
Also, you are not returning notifications elements from render function:
socket.onmessage = function(event) {
console.log("Received message" + event.data.toString());
store.dispatch(receivedPushNotification(event.data));
};
var App = React.createClass({
render: function () {
// To render notifications, return it array from render function
return _.map(this.props.pushNotifications, function(value, key, notification) {
var percentage = (notification.count / 50) * 100;
return (
<div className="row" key={notification.pushid}>
<div className="col-sm-12">
<Card>
<h1 className="marB15">{notification.pushid}</h1>
<div className="clearfix">
<div className="progress progress-striped active marB10">
<div className="progress-bar" style={{'width': percentage + '%'}}></div>
</div>
<div className="pull-right">
<p>Total: {notification.count}</p>
</div>
</div>
</Card>
</div>
</div>
)
});
}
});

add return statement in your render, after map
return (<div>{pushNotifications}</div>);
in reducer you should add new notif in array
case 'RECEIVED_PUSH_NOTIFICATION':
var notif = JSON.parse(action.PushNotification);
return [...state, notif ];

Pull data from IndexedDB into array and output it via ReactJS

My actual Javascript code is the following:
var schoolsData = new Array();
myDB.schools
.each(function(school) {
console.log('"' + school.title + '" wird auf den Array gepusht.');
schoolsData.push(new Array(school.title, schools.schoolnumber, school.address, school.principal, school.email, school.creationdate, school.lastupdate, school.comment));
});
var SchoolsRender = React.createClass({
render: function() {
return (
<tr>
{this.props.list.map(function(listValue){
return <td>{listValue}</td>;
})}
</tr>
)
}
});
ReactDOM.render(<SchoolsRender list={schoolsData} />, document.getElementById('schoolsDATA'));
As you can see I am trying to pull data from my local IndexedDB database (I am using dexieJS) and put it via ReactJS into a table element but nothing appears. Where is the point?
Edit: I think the problem is basically that I'm trying to output that 3D array. Is there any simple and elegant solution?

Add another component RowRender to render single row. Modify SchoolsRender component accordingly.
var RowRender = React.createClass({
render: function() {
return (
<tr>
<td>{this.props.title}</td>
<td>{this.props.schoolnumber}</td>
<td>{this.props.address}</td>
<td>{this.props.principal}</td>
</tr>
)
}
});
var SchoolsRender = React.createClass({
render: function() {
return (
<table>
{this.props.list.map(function(listValue,index){
return <RowRender key={index} title={listValue.title} schoolnumber={listValue.schoolnumber} address={listValue.address} title={listValue.address} />;
})}
</table>
)
}
});

How do I handle complex objects in ReactJS?

I have the following ReactJS code :
var data1 = {"Columns":["Title1","Title2","Title3"],"Rows":[{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]}]};
var GridRow = React.createClass({
render: function() {
if(this.props.data){
}
return (
<div>Text</div>
);
}
});
var GridList = React.createClass({
render: function() {
if(this.props.data){
var Header = this.props.data.Columns.map(function (columns) {
return (
<GridRow data={columns}>
);
});
var Row = this.props.data.Rows.map(function (rows) {
return (
<GridRow data={rows}>
);
});
}
return (
<ul>
<li>{Header}</li>
<li>{Row}</li>
</ul>
);
}
});
var GridBox = React.createClass({
render: function(){
return (
<GridList data={data1} />
);
}
});
I'm trying to pass the data1 variable to the GridList where it is split up to Columns (for header) and rows. The problem is that I get the following exception at runtime:
In file "~/Scripts/Grid.jsx": Parse Error: Line 30: Unexpected token
return (at line 30 column 6) Line: 52 Column:3
I'm running this from within Visual Studio 2013 with ReactJS.
The stated Line nr and colum makes no sense
Im trying to render a table based on metadata(columns) and row data from service.

You need to close tags either with a matching closing tag, or using self closing tags.
// ERROR
<GridRow data={rows}>
// OK
<GridRow data={rows}></GridRow>
// Best
<GridRow data={rows} />
The error message isn't very helpful.
Also, when creating an array of nodes, it's good to give them keys.
Rows.map(function(row, i){
return <GridRow data={rows} key={i} />;
});
I played around with it some more, and the weirdness comes from JSX accepting anything between an opening tag and <, {, or } as raw text. If you did something like this:
var GridList = React.createClass({
render: function() {
if(this.props.data){
var Header = this.props.data.Columns.map(function (columns) {
return (
<GridRow data={columns}>
);
});
var Row = this.props.data.Rows.map(function (rows) </GridRow>
)});
}
return (
<ul>
<li>{Header}</li>
<li>{Row}</li>
</ul>
);
}
});
It'll happily output this:
var GridList = React.createClass({displayName: "GridList",
render: function() {
if(this.props.data){
var Header = this.props.data.Columns.map(function (columns) {
return (
React.createElement(GridRow, {data: columns},
");" + ' ' +
"});" + ' ' +
"var Row = this.props.data.Rows.map(function (rows) ")
)});
}
return (
React.createElement("ul", null,
React.createElement("li", null, Header),
React.createElement("li", null, Row)
)
);
}
});
It's completely content until it encounters the { after Rows.map(function (rows), which means "go back into JavaScript expression mode", and it encounters a return in an expression, which is invalid, so it bails, and gives the best error it can.

We Keep Coding

JavaScript is the programming language of the Web.

How to turn objects in to HTML - javascript

Related

ReactJS Different Classes

ReactJS rerender after AJAX call

React Redux only displaying one element

Pull data from IndexedDB into array and output it via ReactJS

How do I handle complex objects in ReactJS?

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