group option items javascript

I have a multiple select which contains options

<select id="cart" name="cart" multiple>

    <option price="4.00" name="Green Beans">

    <option price="4.00" name="Green Beans">

    <option price="4.00" name="Green Beans">

    <option price="6.00" name="Blue Beans">

    <option price="7.00" name="Black Beans">

    <option price="7.00" name="Black Beans">

</select>

I want to group them using javascript so I can obtain

<select id="cart" name="cart" multiple>

    <option price="4.00" name="3x Green Beans">

    <option price="6.00" name="1x Blue Beans">

    <option price="7.00" name="2x Black Beans">

</select>

edited Nov 24 '18 at 16:44

Foo

asked Nov 24 '18 at 16:10

xtrashild

1

what did you try so far ?

– MrAleister
Nov 24 '18 at 16:14

1

What is the source of your data? Are you receive html?

– Jim B.
Nov 24 '18 at 16:15

Why do you need a name on <option>?

– charlietfl
Nov 24 '18 at 16:18

When should the grouping occur? By event or initially?

– UModeL
Nov 24 '18 at 16:20

the grouping should occur when i click a button

– xtrashild
Nov 24 '18 at 16:27

|
show 1 more comment

I have a multiple select which contains options

<select id="cart" name="cart" multiple>

    <option price="4.00" name="Green Beans">

    <option price="4.00" name="Green Beans">

    <option price="4.00" name="Green Beans">

    <option price="6.00" name="Blue Beans">

    <option price="7.00" name="Black Beans">

    <option price="7.00" name="Black Beans">

</select>

I want to group them using javascript so I can obtain

<select id="cart" name="cart" multiple>

    <option price="4.00" name="3x Green Beans">

    <option price="6.00" name="1x Blue Beans">

    <option price="7.00" name="2x Black Beans">

</select>

edited Nov 24 '18 at 16:44

Foo

asked Nov 24 '18 at 16:10

xtrashild

1

what did you try so far ?

– MrAleister
Nov 24 '18 at 16:14

1

What is the source of your data? Are you receive html?

– Jim B.
Nov 24 '18 at 16:15

Why do you need a name on <option>?

– charlietfl
Nov 24 '18 at 16:18

When should the grouping occur? By event or initially?

– UModeL
Nov 24 '18 at 16:20

the grouping should occur when i click a button

– xtrashild
Nov 24 '18 at 16:27

|
show 1 more comment

I have a multiple select which contains options

<select id="cart" name="cart" multiple>

    <option price="4.00" name="Green Beans">

    <option price="4.00" name="Green Beans">

    <option price="4.00" name="Green Beans">

    <option price="6.00" name="Blue Beans">

    <option price="7.00" name="Black Beans">

    <option price="7.00" name="Black Beans">

</select>

I want to group them using javascript so I can obtain

<select id="cart" name="cart" multiple>

    <option price="4.00" name="3x Green Beans">

    <option price="6.00" name="1x Blue Beans">

    <option price="7.00" name="2x Black Beans">

</select>

edited Nov 24 '18 at 16:44

Foo

asked Nov 24 '18 at 16:10

xtrashild

I have a multiple select which contains options

<select id="cart" name="cart" multiple>

    <option price="4.00" name="Green Beans">

    <option price="4.00" name="Green Beans">

    <option price="4.00" name="Green Beans">

    <option price="6.00" name="Blue Beans">

    <option price="7.00" name="Black Beans">

    <option price="7.00" name="Black Beans">

</select>

I want to group them using javascript so I can obtain

<select id="cart" name="cart" multiple>

    <option price="4.00" name="3x Green Beans">

    <option price="6.00" name="1x Blue Beans">

    <option price="7.00" name="2x Black Beans">

</select>

javascript html select grouping options

edited Nov 24 '18 at 16:44

Foo

asked Nov 24 '18 at 16:10

xtrashild

edited Nov 24 '18 at 16:44

Foo

asked Nov 24 '18 at 16:10

xtrashild

edited Nov 24 '18 at 16:44

Foo

edited Nov 24 '18 at 16:44

Foo

edited Nov 24 '18 at 16:44

Foo

asked Nov 24 '18 at 16:10

xtrashild

asked Nov 24 '18 at 16:10

xtrashild

asked Nov 24 '18 at 16:10

xtrashild

1

what did you try so far ?

– MrAleister
Nov 24 '18 at 16:14

1

What is the source of your data? Are you receive html?

– Jim B.
Nov 24 '18 at 16:15

Why do you need a name on <option>?

– charlietfl
Nov 24 '18 at 16:18

When should the grouping occur? By event or initially?

– UModeL
Nov 24 '18 at 16:20

the grouping should occur when i click a button

– xtrashild
Nov 24 '18 at 16:27

|
show 1 more comment

1

what did you try so far ?

– MrAleister
Nov 24 '18 at 16:14

1

What is the source of your data? Are you receive html?

– Jim B.
Nov 24 '18 at 16:15

Why do you need a name on <option>?

– charlietfl
Nov 24 '18 at 16:18

When should the grouping occur? By event or initially?

– UModeL
Nov 24 '18 at 16:20

the grouping should occur when i click a button

– xtrashild
Nov 24 '18 at 16:27

what did you try so far ?

– MrAleister
Nov 24 '18 at 16:14

What is the source of your data? Are you receive html?

– Jim B.
Nov 24 '18 at 16:15

Why do you need a name on <option>?

– charlietfl
Nov 24 '18 at 16:18

When should the grouping occur? By event or initially?

– UModeL
Nov 24 '18 at 16:20

the grouping should occur when i click a button

– xtrashild
Nov 24 '18 at 16:27

|
show 1 more comment

2 Answers
2

active

oldest

votes

My idea: Getting all options tags, then using while loop to check until the tags array doesn't have any item.

Inside the loop, we try to compare price attribute in the first item of the array with the price attribute of the others. After getting, push them to the result array.

Then, we use the new loop to update the name attribute to the specific tag and delete the duplicate(s).

You can use F12 to check html code in the result.

Result:

<select id="cart" name="cart" multiple="">

  <option price="4.00" name="3x Green Beans">Item 1</option>

  <option price="6.00" name="1x Blue Beans">Item 4</option>

  <option price="7.00" name="2x Black Beans">Item 5</option>

</select>

var options = Array.from(document.querySelectorAll('option'));



var result = ;



while (options.length) {

  var price = options[0].getAttribute('price');



  var items = options.filter(x => x.getAttribute('price') === price);

  

  items.forEach(x => options.splice(options.findIndex(e => e.getAttribute('price') === x.getAttribute('price')),1));

  

  result.push(items);

}



for (var items of result) {

  var price = items[0].getAttribute('price');

  

  var prices = Array.from(document.querySelectorAll(`[price='${price}']`));

  

  var name = prices[0].getAttribute('name');

  

  prices[0].setAttribute('name', `${prices.length}x ${name}`);

  

  var temp = prices.filter((x, y) => y);

  

  temp.forEach(x => x.remove());

}

<select id="cart" name="cart" multiple>

  <option price="4.00" name="Green Beans">Item 1

  <option price="4.00" name="Green Beans">Item 2

  <option price="4.00" name="Green Beans">Item 3

  <option price="6.00" name="Blue Beans">Item 4

  <option price="7.00" name="Black Beans">Item 5

  <option price="7.00" name="Black Beans">Item 6

</select>

edited Nov 24 '18 at 16:42

answered Nov 24 '18 at 16:36

Foo

add a comment |

See comments inline below, but be warned that your existing HTML is invalid because there is no such attribute as price and with a select, you should have closing option tags and the option elements should contain the default text to display.

// Convert initial options to an array

let input = 

  Array.prototype.slice.call(document.querySelectorAll("#cart > option"));

  

let output = ; // Prepare final array



// Loop over initial array

input.forEach(function(item, pos) {

    let sItem = item.outerHTML; // Convert DOM element to string

    

    // If output array doesn't contain input string...

    if(output.indexOf(sItem) == -1){

      output.push(sItem);  // Add it to the output array

    }

});



// Replace the select with the output

document.getElementById("cart").innerHTML = output.join("");

<select id="cart" name="cart" multiple>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="6.00">Blue Beans</option>

  <option value="7.00">Black Beans</option>

  <option value="7.00">Black Beans</option>

</select>

answered Nov 24 '18 at 16:54

Scott Marcus

39.4k52037

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

My idea: Getting all options tags, then using while loop to check until the tags array doesn't have any item.

Inside the loop, we try to compare price attribute in the first item of the array with the price attribute of the others. After getting, push them to the result array.

Then, we use the new loop to update the name attribute to the specific tag and delete the duplicate(s).

You can use F12 to check html code in the result.

Result:

<select id="cart" name="cart" multiple="">

  <option price="4.00" name="3x Green Beans">Item 1</option>

  <option price="6.00" name="1x Blue Beans">Item 4</option>

  <option price="7.00" name="2x Black Beans">Item 5</option>

</select>

var options = Array.from(document.querySelectorAll('option'));



var result = ;



while (options.length) {

  var price = options[0].getAttribute('price');



  var items = options.filter(x => x.getAttribute('price') === price);

  

  items.forEach(x => options.splice(options.findIndex(e => e.getAttribute('price') === x.getAttribute('price')),1));

  

  result.push(items);

}



for (var items of result) {

  var price = items[0].getAttribute('price');

  

  var prices = Array.from(document.querySelectorAll(`[price='${price}']`));

  

  var name = prices[0].getAttribute('name');

  

  prices[0].setAttribute('name', `${prices.length}x ${name}`);

  

  var temp = prices.filter((x, y) => y);

  

  temp.forEach(x => x.remove());

}

<select id="cart" name="cart" multiple>

  <option price="4.00" name="Green Beans">Item 1

  <option price="4.00" name="Green Beans">Item 2

  <option price="4.00" name="Green Beans">Item 3

  <option price="6.00" name="Blue Beans">Item 4

  <option price="7.00" name="Black Beans">Item 5

  <option price="7.00" name="Black Beans">Item 6

</select>

edited Nov 24 '18 at 16:42

answered Nov 24 '18 at 16:36

Foo

add a comment |

My idea: Getting all options tags, then using while loop to check until the tags array doesn't have any item.

Inside the loop, we try to compare price attribute in the first item of the array with the price attribute of the others. After getting, push them to the result array.

Then, we use the new loop to update the name attribute to the specific tag and delete the duplicate(s).

You can use F12 to check html code in the result.

Result:

<select id="cart" name="cart" multiple="">

  <option price="4.00" name="3x Green Beans">Item 1</option>

  <option price="6.00" name="1x Blue Beans">Item 4</option>

  <option price="7.00" name="2x Black Beans">Item 5</option>

</select>

var options = Array.from(document.querySelectorAll('option'));



var result = ;



while (options.length) {

  var price = options[0].getAttribute('price');



  var items = options.filter(x => x.getAttribute('price') === price);

  

  items.forEach(x => options.splice(options.findIndex(e => e.getAttribute('price') === x.getAttribute('price')),1));

  

  result.push(items);

}



for (var items of result) {

  var price = items[0].getAttribute('price');

  

  var prices = Array.from(document.querySelectorAll(`[price='${price}']`));

  

  var name = prices[0].getAttribute('name');

  

  prices[0].setAttribute('name', `${prices.length}x ${name}`);

  

  var temp = prices.filter((x, y) => y);

  

  temp.forEach(x => x.remove());

}

<select id="cart" name="cart" multiple>

  <option price="4.00" name="Green Beans">Item 1

  <option price="4.00" name="Green Beans">Item 2

  <option price="4.00" name="Green Beans">Item 3

  <option price="6.00" name="Blue Beans">Item 4

  <option price="7.00" name="Black Beans">Item 5

  <option price="7.00" name="Black Beans">Item 6

</select>

edited Nov 24 '18 at 16:42

answered Nov 24 '18 at 16:36

Foo

add a comment |

My idea: Getting all options tags, then using while loop to check until the tags array doesn't have any item.

Inside the loop, we try to compare price attribute in the first item of the array with the price attribute of the others. After getting, push them to the result array.

Then, we use the new loop to update the name attribute to the specific tag and delete the duplicate(s).

You can use F12 to check html code in the result.

Result:

<select id="cart" name="cart" multiple="">

  <option price="4.00" name="3x Green Beans">Item 1</option>

  <option price="6.00" name="1x Blue Beans">Item 4</option>

  <option price="7.00" name="2x Black Beans">Item 5</option>

</select>

var options = Array.from(document.querySelectorAll('option'));



var result = ;



while (options.length) {

  var price = options[0].getAttribute('price');



  var items = options.filter(x => x.getAttribute('price') === price);

  

  items.forEach(x => options.splice(options.findIndex(e => e.getAttribute('price') === x.getAttribute('price')),1));

  

  result.push(items);

}



for (var items of result) {

  var price = items[0].getAttribute('price');

  

  var prices = Array.from(document.querySelectorAll(`[price='${price}']`));

  

  var name = prices[0].getAttribute('name');

  

  prices[0].setAttribute('name', `${prices.length}x ${name}`);

  

  var temp = prices.filter((x, y) => y);

  

  temp.forEach(x => x.remove());

}

<select id="cart" name="cart" multiple>

  <option price="4.00" name="Green Beans">Item 1

  <option price="4.00" name="Green Beans">Item 2

  <option price="4.00" name="Green Beans">Item 3

  <option price="6.00" name="Blue Beans">Item 4

  <option price="7.00" name="Black Beans">Item 5

  <option price="7.00" name="Black Beans">Item 6

</select>

edited Nov 24 '18 at 16:42

answered Nov 24 '18 at 16:36

Foo

My idea: Getting all options tags, then using while loop to check until the tags array doesn't have any item.

Inside the loop, we try to compare price attribute in the first item of the array with the price attribute of the others. After getting, push them to the result array.

Then, we use the new loop to update the name attribute to the specific tag and delete the duplicate(s).

You can use F12 to check html code in the result.

Result:

<select id="cart" name="cart" multiple="">

  <option price="4.00" name="3x Green Beans">Item 1</option>

  <option price="6.00" name="1x Blue Beans">Item 4</option>

  <option price="7.00" name="2x Black Beans">Item 5</option>

</select>

var options = Array.from(document.querySelectorAll('option'));



var result = ;



while (options.length) {

  var price = options[0].getAttribute('price');



  var items = options.filter(x => x.getAttribute('price') === price);

  

  items.forEach(x => options.splice(options.findIndex(e => e.getAttribute('price') === x.getAttribute('price')),1));

  

  result.push(items);

}



for (var items of result) {

  var price = items[0].getAttribute('price');

  

  var prices = Array.from(document.querySelectorAll(`[price='${price}']`));

  

  var name = prices[0].getAttribute('name');

  

  prices[0].setAttribute('name', `${prices.length}x ${name}`);

  

  var temp = prices.filter((x, y) => y);

  

  temp.forEach(x => x.remove());

}

<select id="cart" name="cart" multiple>

  <option price="4.00" name="Green Beans">Item 1

  <option price="4.00" name="Green Beans">Item 2

  <option price="4.00" name="Green Beans">Item 3

  <option price="6.00" name="Blue Beans">Item 4

  <option price="7.00" name="Black Beans">Item 5

  <option price="7.00" name="Black Beans">Item 6

</select>

var options = Array.from(document.querySelectorAll('option'));



var result = ;



while (options.length) {

  var price = options[0].getAttribute('price');



  var items = options.filter(x => x.getAttribute('price') === price);

  

  items.forEach(x => options.splice(options.findIndex(e => e.getAttribute('price') === x.getAttribute('price')),1));

  

  result.push(items);

}



for (var items of result) {

  var price = items[0].getAttribute('price');

  

  var prices = Array.from(document.querySelectorAll(`[price='${price}']`));

  

  var name = prices[0].getAttribute('name');

  

  prices[0].setAttribute('name', `${prices.length}x ${name}`);

  

  var temp = prices.filter((x, y) => y);

  

  temp.forEach(x => x.remove());

}

<select id="cart" name="cart" multiple>

  <option price="4.00" name="Green Beans">Item 1

  <option price="4.00" name="Green Beans">Item 2

  <option price="4.00" name="Green Beans">Item 3

  <option price="6.00" name="Blue Beans">Item 4

  <option price="7.00" name="Black Beans">Item 5

  <option price="7.00" name="Black Beans">Item 6

</select>

var options = Array.from(document.querySelectorAll('option'));



var result = ;



while (options.length) {

  var price = options[0].getAttribute('price');



  var items = options.filter(x => x.getAttribute('price') === price);

  

  items.forEach(x => options.splice(options.findIndex(e => e.getAttribute('price') === x.getAttribute('price')),1));

  

  result.push(items);

}



for (var items of result) {

  var price = items[0].getAttribute('price');

  

  var prices = Array.from(document.querySelectorAll(`[price='${price}']`));

  

  var name = prices[0].getAttribute('name');

  

  prices[0].setAttribute('name', `${prices.length}x ${name}`);

  

  var temp = prices.filter((x, y) => y);

  

  temp.forEach(x => x.remove());

}

<select id="cart" name="cart" multiple>

  <option price="4.00" name="Green Beans">Item 1

  <option price="4.00" name="Green Beans">Item 2

  <option price="4.00" name="Green Beans">Item 3

  <option price="6.00" name="Blue Beans">Item 4

  <option price="7.00" name="Black Beans">Item 5

  <option price="7.00" name="Black Beans">Item 6

</select>

edited Nov 24 '18 at 16:42

answered Nov 24 '18 at 16:36

Foo

edited Nov 24 '18 at 16:42

answered Nov 24 '18 at 16:36

Foo

answered Nov 24 '18 at 16:36

Foo

answered Nov 24 '18 at 16:36

Foo

add a comment |

// Convert initial options to an array

let input = 

  Array.prototype.slice.call(document.querySelectorAll("#cart > option"));

  

let output = ; // Prepare final array



// Loop over initial array

input.forEach(function(item, pos) {

    let sItem = item.outerHTML; // Convert DOM element to string

    

    // If output array doesn't contain input string...

    if(output.indexOf(sItem) == -1){

      output.push(sItem);  // Add it to the output array

    }

});



// Replace the select with the output

document.getElementById("cart").innerHTML = output.join("");

<select id="cart" name="cart" multiple>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="6.00">Blue Beans</option>

  <option value="7.00">Black Beans</option>

  <option value="7.00">Black Beans</option>

</select>

answered Nov 24 '18 at 16:54

Scott Marcus

39.4k52037

add a comment |

// Convert initial options to an array

let input = 

  Array.prototype.slice.call(document.querySelectorAll("#cart > option"));

  

let output = ; // Prepare final array



// Loop over initial array

input.forEach(function(item, pos) {

    let sItem = item.outerHTML; // Convert DOM element to string

    

    // If output array doesn't contain input string...

    if(output.indexOf(sItem) == -1){

      output.push(sItem);  // Add it to the output array

    }

});



// Replace the select with the output

document.getElementById("cart").innerHTML = output.join("");

<select id="cart" name="cart" multiple>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="6.00">Blue Beans</option>

  <option value="7.00">Black Beans</option>

  <option value="7.00">Black Beans</option>

</select>

answered Nov 24 '18 at 16:54

Scott Marcus

39.4k52037

add a comment |

// Convert initial options to an array

let input = 

  Array.prototype.slice.call(document.querySelectorAll("#cart > option"));

  

let output = ; // Prepare final array



// Loop over initial array

input.forEach(function(item, pos) {

    let sItem = item.outerHTML; // Convert DOM element to string

    

    // If output array doesn't contain input string...

    if(output.indexOf(sItem) == -1){

      output.push(sItem);  // Add it to the output array

    }

});



// Replace the select with the output

document.getElementById("cart").innerHTML = output.join("");

<select id="cart" name="cart" multiple>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="6.00">Blue Beans</option>

  <option value="7.00">Black Beans</option>

  <option value="7.00">Black Beans</option>

</select>

answered Nov 24 '18 at 16:54

Scott Marcus

39.4k52037

// Convert initial options to an array

let input = 

  Array.prototype.slice.call(document.querySelectorAll("#cart > option"));

  

let output = ; // Prepare final array



// Loop over initial array

input.forEach(function(item, pos) {

    let sItem = item.outerHTML; // Convert DOM element to string

    

    // If output array doesn't contain input string...

    if(output.indexOf(sItem) == -1){

      output.push(sItem);  // Add it to the output array

    }

});



// Replace the select with the output

document.getElementById("cart").innerHTML = output.join("");

<select id="cart" name="cart" multiple>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="6.00">Blue Beans</option>

  <option value="7.00">Black Beans</option>

  <option value="7.00">Black Beans</option>

</select>

// Convert initial options to an array

let input = 

  Array.prototype.slice.call(document.querySelectorAll("#cart > option"));

  

let output = ; // Prepare final array



// Loop over initial array

input.forEach(function(item, pos) {

    let sItem = item.outerHTML; // Convert DOM element to string

    

    // If output array doesn't contain input string...

    if(output.indexOf(sItem) == -1){

      output.push(sItem);  // Add it to the output array

    }

});



// Replace the select with the output

document.getElementById("cart").innerHTML = output.join("");

<select id="cart" name="cart" multiple>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="6.00">Blue Beans</option>

  <option value="7.00">Black Beans</option>

  <option value="7.00">Black Beans</option>

</select>

// Convert initial options to an array

let input = 

  Array.prototype.slice.call(document.querySelectorAll("#cart > option"));

  

let output = ; // Prepare final array



// Loop over initial array

input.forEach(function(item, pos) {

    let sItem = item.outerHTML; // Convert DOM element to string

    

    // If output array doesn't contain input string...

    if(output.indexOf(sItem) == -1){

      output.push(sItem);  // Add it to the output array

    }

});



// Replace the select with the output

document.getElementById("cart").innerHTML = output.join("");

<select id="cart" name="cart" multiple>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="4.00">Green Beans</option>

  <option value="6.00">Blue Beans</option>

  <option value="7.00">Black Beans</option>

  <option value="7.00">Black Beans</option>

</select>

answered Nov 24 '18 at 16:54

Scott Marcus

39.4k52037

answered Nov 24 '18 at 16:54

Scott Marcus

39.4k52037

answered Nov 24 '18 at 16:54

Scott Marcus

39.4k52037

answered Nov 24 '18 at 16:54

Scott Marcus

39.4k52037

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