Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
The issue is that you are listening to the `input` event instead of the `change` event. The `input` event is fired when the value is changed, but the `change` event is fired when the value is committed (when the user stops interacting with the slider). To fix this, replace the `input` event listener with the `change` event listener:
1 2 3 | slider.addEventListener("change", (event) => { console.log(event.target.value); }); |
1 2 3 4 5 6 7 | slider.addEventListener("input", (event) => { console.log("Value while sliding: " + event.target.value); }); slider.addEventListener("change", (event) => { console.log("Final value: " + event.target.value); }); |
Below is a student's answer to a question about what a particular instruction does: The issue is that you are listening to the `input` event instead of the `change` event. The `input` event is fired when the value is changed, but the `change` event is fired when the value is committed (when the user stops interacting with the slider). To fix this, replace the `input` event listener with the `change` event listener:
1 2 3 | slider.addEventListener("change", (event) => { console.log(event.target.value); }); |
1 2 3 4 5 6 7 | slider.addEventListener("input", (event) => { console.log("Value while sliding: " + event.target.value); }); slider.addEventListener("change", (event) => { console.log("Final value: " + event.target.value); }); |
The student fails. The student's answer explains the difference between the `input` and `change` events and how to use them with event listeners in JavaScript, particularly in the context of a slider element. However, it does not address or mention anything about editing the `innerHTML` of an element and its effect on clearing event listeners, which is a different topic.
Testing if the previous output contains the string student passes
: False
Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
The issue is that you are adding the `input` event listener before the slider element is added to the DOM. You need to move the event listener code inside the constructor function after the slider element is created and appended to the `div`. Here's the updated code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em"; parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range"; slider.id = "foo"; slider.min = "0"; slider.max = "100"; slider.step = ".1"; this.slider = slider; div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; // Move the event listener code here slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } |
Below is a student's answer to a question about what a particular instruction does: The issue is that you are adding the `input` event listener before the slider element is added to the DOM. You need to move the event listener code inside the constructor function after the slider element is created and appended to the `div`. Here's the updated code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em"; parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range"; slider.id = "foo"; slider.min = "0"; slider.max = "100"; slider.step = ".1"; this.slider = slider; div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; // Move the event listener code here slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } |
The student fails. The student's explanation and solution address a different issue related to the timing of adding an event listener to a DOM element. They correctly identify and solve the problem of adding an event listener to an element before it is appended to the DOM. However, they do not mention or address the issue of event listeners being cleared due to editing the `innerHTML` of an element, which is a distinct issue.
Testing if the previous output contains the string student passes
: False
Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
The issue is that you're attaching the event listener to the `input` event, but you should be attaching it to the `change` event for sliders. The `input` event fires continuously while the slider value is being changed, which can cause performance issues if you have heavy computations or updates tied to the event. The `change` event, on the other hand, fires only once after the slider value has been changed and the user has released the mouse button or finished dragging. Here's the corrected code:
1 2 3 | slider.addEventListener("change", (event) => { console.log(event.target.value); }); |
Below is a student's answer to a question about what a particular instruction does: The issue is that you're attaching the event listener to the `input` event, but you should be attaching it to the `change` event for sliders. The `input` event fires continuously while the slider value is being changed, which can cause performance issues if you have heavy computations or updates tied to the event. The `change` event, on the other hand, fires only once after the slider value has been changed and the user has released the mouse button or finished dragging. Here's the corrected code:
1 2 3 | slider.addEventListener("change", (event) => { console.log(event.target.value); }); |
The student's answer does not say something similar to "editing the innerHTML clears event listeners." Instead, the student discusses the difference between the `input` and `change` events when attached to a slider and the implications of using one over the other in terms of performance. Therefore, "The student fails" in terms of addressing the specific point about editing the innerHTML clearing event listeners.
Testing if the previous output contains the string student passes
: False
Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
The issue with your code is that you're not assigning the `change` event listener to the slider input. The `input` event fires whenever the value of the input element is changed. However, if you move the slider with the mouse and release it, the `change` event is triggered instead of the `input` event. To fix this, you need to listen for both the `input` and `change` events. Here's the modified code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); slider.addEventListener("change", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } |
Below is a student's answer to a question about what a particular instruction does: The issue with your code is that you're not assigning the `change` event listener to the slider input. The `input` event fires whenever the value of the input element is changed. However, if you move the slider with the mouse and release it, the `change` event is triggered instead of the `input` event. To fix this, you need to listen for both the `input` and `change` events. Here's the modified code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); slider.addEventListener("change", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } |
The student's answer does not mention anything about "editing the innerHTML clears event listeners." Instead, the student focuses on explaining the difference between the `input` and `change` events for an input element of type "range" (a slider) and how to properly listen to these events to capture the value changes. Therefore, based on the given instruction, "The student fails."
Testing if the previous output contains the string student passes
: False
Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
Why doesn't the slider onchange event fire when I run this code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random() parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em" parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range" slider.id = "foo" slider.min = "0" slider.max = "100" slider.step = ".1" this.slider = slider div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}) root_node = mul; var dropdown = new Dropdown(mul.node, mul); } </script> </body> |
The issue with the provided code is that the `oninput` event is not firing because the `input` element with the `type="range"` is not properly associated with a `form` element. The `oninput` event requires the `input` element to be part of a `form` to function correctly. To fix this issue, you can wrap the `input` element inside a `form` element, or you can use the `input` event instead of the `oninput` event, as the `input` event works for all `input` elements, regardless of whether they are part of a `form` or not. Here's the updated code with the `input` event:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random(); parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em"; parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range"; slider.id = "foo"; slider.min = "0"; slider.max = "100"; slider.step = ".1"; this.slider = slider; div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}); root_node = mul; var dropdown = new Dropdown(mul.node, mul); }; </script> </body> |
Below is a student's answer to a question about what a particular instruction does: The issue with the provided code is that the `oninput` event is not firing because the `input` element with the `type="range"` is not properly associated with a `form` element. The `oninput` event requires the `input` element to be part of a `form` to function correctly. To fix this issue, you can wrap the `input` element inside a `form` element, or you can use the `input` event instead of the `oninput` event, as the `input` event works for all `input` elements, regardless of whether they are part of a `form` or not. Here's the updated code with the `input` event:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | <body> <script> var candidate_paper_list; class Dropdown { constructor(parent_html, parent_node) { var r = Math.random(); parent_html.innerHTML += `<div class="autocomplete-container" style="border: 1px solid #000; padding: 1em"> <label for="search-input">Search Paper Titles:</label> <input type="text" id="search-input-${r}" autocomplete="off"> <div id="autocomplete-results"></div> </div>`; } } class Mul { constructor(parent_html, parent_node) { var div = document.createElement("div"); div.style = "border: 1px solid #000; padding: 1em"; parent_html.appendChild(div); var slider = document.createElement("input"); slider.type = "range"; slider.id = "foo"; slider.min = "0"; slider.max = "100"; slider.step = ".1"; this.slider = slider; div.appendChild(slider); this.node = div; div.appendChild(document.createElement("br")); parent_node.child = this; slider.addEventListener("input", (event) => { console.log(event.target.value); }); } serialize() { console.log("VALUE", this.slider.value); console.log("VALUE", this.slider); let positive_papers = ['const_mul', this.child.serialize(), +this.slider.value]; return positive_papers; } } document.body.onload = function() { var mul = new Mul(document.body, {}); root_node = mul; var dropdown = new Dropdown(mul.node, mul); }; </script> </body> |
The student fails. The student's explanation and solution do not address the actual issue of "editing the innerHTML clears event listeners." Instead, the student incorrectly states that the `oninput` event requires the `input` element to be part of a `form` to function correctly, which is not true. The `oninput` event works for `input` elements regardless of their association with a `form`. The provided solution and explanation do not address the core issue of event listeners being removed when the `innerHTML` property is used to modify the DOM, which can indeed remove event listeners attached to elements within that HTML structure.
Testing if the previous output contains the string student passes
: False