chaulap：
私はjavascriptのMySQLのAPIを使用してデータベースからレコードを削除しようとしています。私は、データベースからの私のレコードをリストしたテーブルを作成しています。私は、削除ボタンとビューの詳細]ボタンが追加されました。今私は、削除ボタンをクリックしたとき。削除ボタンは、最後の行ではない私がクリックしたというボタンがあるものを削除します。私の見解の詳細ボタンは、ちょうど今、それは同じことをやっているまで、罰金を働いていました。これは、代わりにビューボタンを含む行を最後の行の情報を表示します。私は削除ボタンのコードを追加したときにこれが起こって始めました。コードは以下の通りです。私は何が起こっているか理解するのに役立ちます。
HTMLコード。私が編集したHTMLコードを追加しました。以下の典型的な行。
<tr class="record" id="record153">
<td>John Doe</td>
<td>11p</td>
<td>10</td>
<td>Cotton</td>
<td><p>Compound D: ranging from 464.29kg to 535.71kg.<br> Ammonium nitrate: ranging from 223.88kg to 253.73kg.<br> Potasium nitrate: ranging from 0.00kg to 0.00kg.</p></td>
<td><button>View Detail</button><button>Delete</button></td>
</tr>
Javascriptコード
var historicalContent = document.querySelector('.historical-data');
window.views.peek().style.display = "none";
historicalContent.style.display = 'block';
var backButton = document.querySelector('#back');
backButton.style.display = 'block';
var dashboard = document.querySelector("#dashboard");
window.views.push(dashboard);
window.views.push(historicalContent);
var table = document.querySelector('.table-container table');
let sql = `SELECT * FROM lab_results`;
let labResultsCollection;
//fire
connection.query(sql, function (err, results, fields) {
if (err) throw err;
else {
labResultsCollection = results;
console.log(results);
for (result of results) {
let record = document.createElement('tr');
record.className = 'record';
record.id = 'record' + result.id;
let farmerName = document.createElement('td');
farmerName.innerText = result.name;
let reference = document.createElement('td');
reference.innerText = result.ref;
let labNumber = document.createElement('td');
labNumber.innerText = result.lab_number;
let recommendations = document.createElement('td');
let cropName = document.createElement('td');
connection.query(`SELECT crop_id FROM crop_has_lab_results WHERE lab_results_id = ${result.id}`,
function (err, bresult, fields) {
if (err) {
throw err
} else {
//now get the id of the crop
crop_id = bresult[0].crop_id;
//fire
connection.query(`SELECT name FROM crop WHERE id = ${crop_id}`,
function (err, cresult, fields) {
if (err) throw err;
else {
cropName.innerText = cresult[0].name;
}
})
}
})
connection.query(`SELECT recommendation_id FROM lab_results_has_recommendation WHERE lab_results_id = ${result.id}`,
function (err, bresult, fields) {
if (err) {
throw err
} else {
//now get the id of the crop
if (bresult.length > 0) {
console.log(bresult);
recommendation_id = bresult[0].recommendation_id;
//fire
connection.query(`SELECT text1,text2,text3 FROM recommendation WHERE id = ${recommendation_id}`,
function (err, cresult, fields) {
if (err) throw err;
else {
let str = `<p>${cresult[0].text1}.<br/> ${cresult[0].text2}.<br/> ${cresult[0].text3}.</p>`;
recommendations.innerHTML = str;
}
})
}
}
})
record.appendChild(farmerName);
record.appendChild(reference);
record.appendChild(labNumber);
record.appendChild(cropName);
record.appendChild(recommendations);
let actions = document.createElement('td')
let viewDetail = document.createElement('button');
viewDetail.innerText = 'View Detail';
let deleteRecord = document.createElement('button');
deleteRecord.innerText = 'Delete';
actions.appendChild(viewDetail);
actions.appendChild(deleteRecord);
record.appendChild(actions);
deleteRecord.addEventListener('click', function () {
let xmysql = `DELETE FROM lab_results_has_recommendation WHERE lab_results_id = ${result.id}`;
let xmysql2 = `DELETE FROM crop_has_lab_results WHERE lab_results_id = ${result.id}`;
let xmysql3 = `DELETE FROM lab_results WHERE id = ${result.id}`;
console.log(xmysql, xmysql2, xmysql3);
connection.query(xmysql, function (err, bresult, fields) {
if (err) throw err;
else {
connection.query(xmysql2, function (err, cresult, fields) {
if (err) throw err;
else {
connection.query(xmysql3, function (err, dresult, fields) {
if (err) throw err;
else {
let record = document.getElementById(`record${result.id}`);
console.log("Id of the removed", result.id);
record.remove();
}
})
}
})
}
})
})
viewDetail.addEventListener('click', function () {
var detailPanel = document.querySelector('#detail-pane');
window.views.peek().style.display = 'none';
detailPanel.style.display = 'block';
detailPanel.innerHTML = '';
window.views.push(detailPanel);
let id = result.id;
let mysql = `SELECT * FROM lab_results WHERE id = ${id}`
connection.query(mysql, function (err, mresult, fields) {
if (err) {
throw err;
} else {
let myresult = mresult[0];
var name = document.createElement('h3');
name.innerText = myresult.name;
detailPanel.appendChild(name);
var lab_number = document.createElement('p');
lab_number.innerText = `Lab number: ${myresult.lab_number}`;
detailPanel.appendChild(lab_number);
var ref = document.createElement('p')
ref.innerText = `Reference: ${myresult.ref}`;
detailPanel.appendChild(ref);
var color = document.createElement('p');
color.innerText = `Color: ${myresult.color}`;
detailPanel.appendChild(color);
var texture = document.createElement('p');
texture.innerText = `Texture: ${myresult.texture}`;
detailPanel.appendChild(texture);
var pH = document.createElement('p');
pH.innerText = `pH: ${myresult.pH}`;
detailPanel.appendChild(pH);
var free_carbonate = document.createElement('p');
free_carbonate.innerText = `Free carbonate: ${myresult.free_carbonate}`;
detailPanel.appendChild(free_carbonate);
var conductivity = document.createElement('p');
conductivity.innerText = `Conductivity: ${myresult.conductivity}`;
detailPanel.appendChild(conductivity);
var nitrogen = document.createElement('p');
nitrogen.innerText = `Initial nitrogen ${myresult.nitrogen}`;
detailPanel.appendChild(nitrogen);
var nitrogen_after = document.createElement('p');
nitrogen_after.innerText = `Nitrogen after incubation ${myresult.m_nitrogen_init}`;
detailPanel.appendChild(nitrogen_after);
var phosphorus = document.createElement('p');
phosphorus.innerText = `Phosphorus: ${myresult.phosphorus}`;
detailPanel.appendChild(phosphorus);
var potasium = document.createElement('p');
potasium.innerText = `Potasium: ${myresult.potasium}`;
detailPanel.appendChild(potasium);
var calcium = document.createElement('p');
calcium.innerText = `Calcium: ${myresult.calcium}`;
detailPanel.appendChild(calcium);
var magnesium = document.createElement('p');
magnesium.innerText = `Magnesium: ${myresult.magnesium}`;
detailPanel.appendChild(magnesium);
var total_bases = document.createElement('p');
total_bases.innerText = `Total bases: ${myresult.total_bases}`;
detailPanel.appendChild(total_bases);
let mysql2 = `SELECT * FROM lab_results_has_recommendation WHERE lab_results_id =
${myresult.id}`;
connection.query(mysql2, function (erra, mresult2, fields) {
if (err) throw err;
else {
let myresult2 = mresult2[0];
let mysql3 = `SELECT * FROM recommendation WHERE id = ${myresult2.recommendation_id}`;
connection.query(mysql3, function (err, mresult3, fields) {
if (err) throw err;
else {
let myresult3 = mresult3[0];
let divider = document.createElement('hr');
divider.width = '100%';
detailPanel.appendChild(divider);
let recommendationView = document.createElement('div');
let recommendationHeading = document.createElement('h4');
recommendationHeading.innerText = 'Recommendation';
recommendationView.appendChild(recommendationHeading);
var nitrogen2 = document.createElement('p');
nitrogen2.innerText = `Nitrogen: from ${myresult3.nitrogen} `;
recommendationView.appendChild(nitrogen2);
var phosphorus2 = document.createElement('p');
phosphorus2.innerText = `Phosphorus: from ${myresult3.phosphorus}`;
recommendationView.appendChild(phosphorus2);
var potasium2 = document.createElement('p');
potasium2.innerText = `Potasium: from ${myresult3.potasium}`;
recommendationView.appendChild(potasium2);
var lime = document.createElement('p');
lime.innerText = `Lime: from ${myresult3.lime}`;
recommendationView.appendChild(lime);
var text1 = document.createElement('p');
var text2 = document.createElement('p');
var text3 = document.createElement('p');
text1.innerText = myresult3.text1;
text2.innerText = myresult3.text2;
text3.innerText = myresult3.text3;
recommendationView.appendChild(text1);
recommendationView.appendChild(text2);
recommendationView.appendChild(text3);
detailPanel.appendChild(recommendationView);
}
})
}
})
}
})
})
table.appendChild(record);
JensV：
沿ってfor (result of results) {、あなた宣言しないresultでletか、constそれは変数が暗黙的にグローバルにすることを意味しています。
あなたは代わりに書くべきですfor (const result of results) {（let技術的に働くだろうが、それはそのスコープの結果は、任意の時点で変更されていないこと、それがより明確になります。