How can i use eval function - javascript

I am creating calculator with Javascript and i have a problem with eval() function
HTML
`
<div class="calCul1">
<div id="firstCol">
<div id="wind"></div>
</div>
<div id="secondCol">
<div class="buttonsCol1">
<div id="underCol1">
<div id="bracketOpen"><button id="bracketOBut" onclick=" ">!</button></div>
<div id="seven"><button id="sevenBut" onclick="add(7)">7</button></div>
<div id="four"><button id="fourBut" onclick="add(4)">4</button></div>
<div id="one"><button id="oneBut" onclick="add(1)">1</button></div>
<div id="zero"><button id="zeroBut" onclick="add(0)">0</button></div>
</div>
<div id="underCol2">
<div id="bracketClose"><button id="root" onclick=" "add>√</button></div>
<div id="eight"><button id="eightBut" onclick="add(8)">8</button></div>
<div id="five"><button id="fiveBut" onclick="add(5)">5</button></div>
<div id="two"><button id="twoBut" onclick="add(2)">2</button></div>
<div id="dote"><button id="doteBut" onclick="addDote('.')">.</button></div>
</div>
</div>
<div class="buttonsCol2">
<div id="underCol3">
<div id="procent"><button id="procentBut" onclick="procent('%')">%</button></div>
<div id="nine"><button id="nineBut" onclick="add(9)">9</button></div>
<div id="six"><button id="sixBut" onclick="add(6)">6</button></div>
<div id="three"><button id="threeBut" onclick="add(3)">3</button></div>
<div id="equals"><button id="equalsBut" onclick="equal('=')">=</button></div>
</div>
<div id="underCol4">
<div id="delete"><button id="deleteBut" onclick="document.getElementById('wind').innerHTML=''">AC</button></div>
<div id="divide"><button id="divideBut" onclick="add('/')">÷</button></div>
<div id="multiply"><button id="multiplyBut" onclick="add('*')">x</button></div>
<div id="minuse"><button id="minuseBut" onclick="add('-')">-</button></div>
<div id="plus"><button id="plusBut" onclick="add('+')">+</button></div>
</div>
</div>
</div>
</div>
`
there is no reaction when i click on "+"
Javascript
let x = document.getElementById("wind");
function add(a) {
// document.getElementById("wind").value =
x.innerHTML += a;
}
function equal() {
// x.style.cssText = `d`
x = eval(x);
// console.log(x);
}
i tried to solve it with .value, but then I couldnt even print the numbers

You probably want to run the eval() function on the text of the wind element - i.e x.innerText - instead of on the element itself - which is what eval(x) is doing.
Also, using eval() to perform arithmetic is a really bad idea.

The issue is here: x = eval(x);. You are just getting all of the object. In your code, the x variable means that the Document method getElementById(). It returns an element object. You should get the element's value, not all of its. Because of that, we use the element property innerHTML. the innerHTML property gets or sets the HTML or XML within the element.
Hope it helps! In addition: Never use eval()!
let x = document.getElementById("wind");
function add(a) {
// document.getElementById("wind").value =
x.innerHTML += a;
}
function equal() {
// x.style.cssText = `d`
x.innerHTML = eval(x.innerHTML);
// console.log(x);
}
<div class="calCul1">
<div id="firstCol">
<div id="wind"></div>
</div>
<div id="secondCol">
<div class="buttonsCol1">
<div id="underCol1">
<div id="bracketOpen"><button id="bracketOBut" onclick=" ">!</button></div>
<div id="seven"><button id="sevenBut" onclick="add(7)">7</button></div>
<div id="four"><button id="fourBut" onclick="add(4)">4</button></div>
<div id="one"><button id="oneBut" onclick="add(1)">1</button></div>
<div id="zero"><button id="zeroBut" onclick="add(0)">0</button></div>
</div>
<div id="underCol2">
<div id="bracketClose"><button id="root" onclick=" "add>√</button></div>
<div id="eight"><button id="eightBut" onclick="add(8)">8</button></div>
<div id="five"><button id="fiveBut" onclick="add(5)">5</button></div>
<div id="two"><button id="twoBut" onclick="add(2)">2</button></div>
<div id="dote"><button id="doteBut" onclick="addDote('.')">.</button></div>
</div>
</div>
<div class="buttonsCol2">
<div id="underCol3">
<div id="procent"><button id="procentBut" onclick="procent('%')">%</button></div>
<div id="nine"><button id="nineBut" onclick="add(9)">9</button></div>
<div id="six"><button id="sixBut" onclick="add(6)">6</button></div>
<div id="three"><button id="threeBut" onclick="add(3)">3</button></div>
<div id="equals"><button id="equalsBut" onclick="equal('=')">=</button></div>
</div>
<div id="underCol4">
<div id="delete"><button id="deleteBut" onclick="document.getElementById('wind').innerHTML=''">AC</button></div>
<div id="divide"><button id="divideBut" onclick="add('/')">÷</button></div>
<div id="multiply"><button id="multiplyBut" onclick="add('*')">x</button></div>
<div id="minuse"><button id="minuseBut" onclick="add('-')">-</button></div>
<div id="plus"><button id="plusBut" onclick="add('+')">+</button></div>
</div>
</div>
</div>
</div>

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Working Fiddle: https://jsfiddle.net/bv7w8dxg/1/
Issue Fiddle: https://jsfiddle.net/bv7w8dxg/
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`
John Doe
<div class="main-holder">
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You are using class selectors, which selects all elements with the given class name. That's why you have all the elements set with same value
You need to wrap your elements then process each row independently
I updated your code snippet to demonstrate this:
$('.row').each(function() {
var takword = $('.nameholder', this).text().split(' ');
var text = '';
$.each(takword, function () {
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$('.avatarholder', this).text(text);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="row">
<div class="nameholder">John Doe</div>
<div class="avatarholder"></div>
</div>
<div class="row">
<div class="nameholder">Kyle Davis</div>
<div class="avatarholder"></div>
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<div class="row">
<div class="nameholder">Seim Seiy</div>
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console.log(header);
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Achieve same sort result in Chrome as other browsers

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How to achieve the same result with Chrome?
I tried, but not working, with:
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$('.files').append(order);
});
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The content of the divs is going to be populated with javascript json. Now, I know how to select a div in javascript:
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On a separate note, wouldn't 'title' and 'jobs' be better classified as classes, and not ids?
This would work:
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Change them to classes, and then you can use querySelector() to target them:
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document.querySelector('.cc .title').style.color= 'red';
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Just try
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Because your HTML code is invalid because the id is already taken.

How to get this value in Javascript?

This is the HTML code:
<div id="CurrencyQuotePane">
<div class="CurrencyQuote">
<div class="column">
<div class="form-label">Pair: </div><div>1/2</div>
<div class="form-label padding-top">Spread: </div><div>385</div>
</div>
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<div class="clear"></div>
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How do I get the 385 in Javascript if it keeps changing?
This is my current javascript:
function getSpread(){
var tag = iframe.contentDocument.getElementByClassName('SPREAD');
var spread = Number(tag[1].innerHTML);
return spread;
}
Sorry if I don't know anything about javascript, I am a complete newbie.
Change it to this:
<div class="column">
<div class="form-label">Pair: </div><div>TEXT</div>
<div class="form-label padding-top">SPREAD</div><div id="spreadval">385</div>
</div>
function getSpread(){
var tag = iframe.contentDocument.getElementById('spreadval');
return parseInt(tag.innerHTML);
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var column = document.getElementsByClassName('column');
var divs = column[0].getElementsByTagName('div');
alert(divs[1].innerHTML);
set id to your div
<div class="column">
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<div class="form-label padding-top">SPREAD</div><div id="changing_number">385</div>
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get with jquery
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var theNumber = parseInt($('#changing_number').text());
});
or with DOM:
$(function(){
var theNumber = parseInt(document.getElementById('changing_number').innerHTML);
});
here you can learn js: http://www.w3schools.com/jsref/met_doc_getelementbyid.asp

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