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[英]Javascript - How can I send the value of the text area to my textbox
[英]How can I pass the value of a variable to a text area using JavaScript?
這是我的代碼:如何使用 JavaScript 將變量的值傳遞給文本區域? 感謝大家的幫助!
var overtimeRate = 1.5;
var regularHours = prompt("How many regular hours?");
var overtime = prompt("How many overtime hours?");
var hourRate = prompt("What is the hour rate of pay?");
var overtimeRatePerHour = hourRate * overtimeRate;
var pay = regularHours * hourRate;
var overtimePay = overtime * overtimeRatePerHour;
function calculator() {
document.write(pay);
document.write('<br>');
document.write(overtimePay);
document.write('<br>');
document.write(overtimePay + pay);
}
document.getElementById("textarea").value = calculator();
創建一個填充 textarea 的函數。
function myFunction() {
var result = pay + '\n' + overtimePay + '\n' + (overtimePay + pay);
document.getElementById("textarea").value = result;
}
然后在 HTML 按鈕中的 onclick 事件上彈出它。
<button onclick="myFunction()">Click me</button>
重寫你的函數,比如
function calculator() {
var output = pay + '<br />' + overtimePay + '<br />' + (overtimePay + pay);
return output;
}
您需要的是返回一個值的函數,然后可以將其放入 textarea。
您的函數不應打印 (document.write)。 它應該返回這樣的文本:
var overtimeRate = 1.5;
var regularHours = prompt("How many regular hours?");
var overtime = prompt("How many overtime hours?");
var hourRate = prompt("What is the hour rate of pay?");
var overtimeRatePerHour = hourRate * overtimeRate;
var pay = regularHours * hourRate;
var overtimePay = overtime * overtimeRatePerHour;
function calculator() {
var ret = '';
ret = ret + pay
ret = ret + '<br>'
ret = ret + overtimePay
ret = ret + '<br>'
ret = ret + overtimePay + pay;
return ret;
}
document.getElementById("textarea").value = calculator();
使用 onclick 事件調用該函數。
<button onclick="myFunction()">Click Here</button>
CyberJunkie 剛剛回答,但他們似乎刪除了它。
或者,您可以將 onchange 事件與某些輸入標簽一起使用。 這將使每次更改一個輸入時執行該功能。 您可以使用 document.getElementById('element_id').value,而不是 Javascript 提示。
<form name="myForm"> Regular Hours: <input type="text" onchange="myFunction()" id="regHrs" value="0"> Overtime Hours:<input type="text" onchange="myFunction()" id="overHrs" value="0"> Pay Rate:<input type="text" onchange="myFunction()" id="rate" value="0"> </form>
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