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<html lang="ru">
<head>
<meta charset="utf-8">
<title>"table_task1" table view</title>
<style type="text/css">
table {
border-spacing: 0;
padding: 0;
border: 1px solid black;
}
thead > tr > th {
padding: 10px;
font-size: 20px;
background-color: #6f6f6f;
}
td {
padding: 5px;
font-size: 17px;
}
#table_operations {
margin: 30px;
font-size: 20px;
}
.odd {
background-color: #dedede;
}
.even {
background-color: #c5c5c5;
}
.keyword {
color: blue;
}
</style>
</head>
<body onload="loadDefaultOperation()">
<table>
%%heading%%
%%body%%
</table>
<div id="table_operations">
<select onchange="typeChanged()" id="operation">
<option>UPDATE</option>
<option>DELETE FROM</option>
<option>INSERT INTO</option>
</select> `table_task1`<br>
<form method="post" action="/update" id="operation_form">
<div id="query"></div>
<button type="submit">Выполнить запрос</button>
</form>
</div>
<script>
let queryHTMLElements = {
'UPDATE': `
<input hidden name="operation" value="UPDATE">
<span class="keyword">SET</span><br>
<div id="update_set"></div>
<button type="button" onclick="addUpdateSet()">Добавить условие</button><br>
<span class="keyword">WHERE</span><br>
<div id="conditions"></div>
<button type="button" onclick="addCondition()">Добавить условие</button>
`,
'DELETE FROM': `
<input hidden name="operation" value="DELETE FROM">
<span class="keyword">WHERE</span><br>
<div id="conditions"></div>
<button type="button" onclick="addCondition()">Добавить условие</button>
`,
'INSERT INTO': `
<input hidden name="operation" value="INSERT INTO">
<span class="keyword">VALUES</span><br>
`
};
const DEFAULT_OPERATION = 'UPDATE';
let expressionsCount = 0;
let conditionsCount = 0;
function loadDefaultOperation() {
let query = document.getElementById('query');
query.innerHTML = queryHTMLElements[DEFAULT_OPERATION];
}
function addUpdateSet() {
let element = document.createElement('div');
const keyName = `expression${expressionsCount}_key`;
const valueName = `expression${expressionsCount}_value`;
element.innerHTML = `<input type="text" name="${keyName}"> = <input type="text" name="${valueName}">`;
document.getElementById('update_set').appendChild(element);
expressionsCount++;
}
function addCondition() {
let element = document.createElement('div');
const keyName = `condition${conditionsCount}_key`;
const valueName = `condition${conditionsCount}_value`;
element.innerHTML = `<input type="text" name="${keyName}"> = <input type="text" name="${valueName}">`;
document.getElementById('conditions').appendChild(element);
conditionsCount++;
}
function typeChanged() {
let query = document.getElementById('query');
let text = document.getElementById('operation').value;
query.innerHTML = queryHTMLElements[text];
let operationForm = document.getElementById('operation_form');
switch (text) {
case 'UPDATE':
operationForm.method = 'POST';
operationForm.action = '/update';
break;
case 'DELETE FROM':
operationForm.method = 'POST';
operationForm.action = '/delete';
break;
case 'INSERT INTO':
operationForm.method = 'POST';
operationForm.action = 'add';
break;
}
expressionsCount = 0;
conditionsCount = 0;
}
</script>
</body>
</html>
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