我想創建一個小的HTML表單,我的用戶需要從複選框和下拉列表中選擇一些選項。預期的結果是隨着用戶更改選擇而動態生成的文本。 這個想法確實有效,但我不斷從下拉框中獲取「[object HTMLSelectElement]」而不是所選選項的值。如果你們其中一位資深JavaScript程序員可以給我你的意見,我將不勝感激!我花了很多時間仔細檢查所有內容,並且我非常確定我的代碼在語法上是正確的,但是如果沒有意識到,我可能完全錯誤。我是JavaScript新手,所以我仍處於學習階段。JavaScript HTML對象HTMLSelectElement
HTML代碼:
<form name="input" action="" method="get">
<input type="checkbox" name="stCode" id="ai1" onChange="generateSTcode()">
Analog Input B1
<select name="sensorType" id="sensorType1" onChange="generateSTcode()">
<option value="2">0-1 Vdc</option>
<option value="3">0-10 Vdc</option>
<option value="4">4-20mA</option>
<option value="5">Off/On</option>
<option value="6">0-5 Vdc</option>
</select>
<select name="sensor" id="sensor1" onChange="generateSTcode()">
<option value="oatp_ai">Outside air temperature</option>
<option value="satp_ai">Supply air temperature</option>
<option value="ratp_ai">Return air temperature</option>
<option value="mxtp_ai">Mixed air temperature</option>
</select><br><br>
<input type="checkbox" name="stCode" id="ai2" onChange="generateSTcode()">
Analog Input B2
<select name="sensorType" id="sensorType2" onChange="generateSTcode()">
<option value="2">0-1 Vdc</option>
<option value="3">0-10 Vdc</option>
<option value="4">4-20mA</option>
<option value="5">Off/On</option>
<option value="6">0-5 Vdc</option>
</select>
<select name="sensor" id="sensor2" onChange="generateSTcode()">
<option value="oatp_ai">Outside air temperature</option>
<option value="satp_ai">Supply air temperature</option>
<option value="ratp_ai">Return air temperature</option>
<option value="mxtp_ai">Mixed air temperature</option>
</select><br><br>
<input type="checkbox" name="stCode" id="ai3" onChange="generateSTcode()">
Analog Input B3
<select name="sensorType" id="sensorType3" onChange="generateSTcode()">
<option value="2">0-1 Vdc</option>
<option value="3">0-10 Vdc</option>
<option value="4">4-20mA</option>
<option value="5">Off/On</option>
<option value="6">0-5 Vdc</option>
</select>
<select name="sensor" id="sensor3" onChange="generateSTcode()">
<option value="oatp_ai">Outside air temperature</option>
<option value="satp_ai">Supply air temperature</option>
<option value="ratp_ai">Return air temperature</option>
<option value="mxtp_ai">Mixed air temperature</option>
</select><br><br>
</form>
<div id="generatedCode" class="generatedCode"></div>
JavaScript代碼:
function generateSTcode(){
var stCodegenerated = "";
var analogInputCh = new Array(3);
analogInputCh[0] = document.getElementById('ai1');
analogInputCh[1] = document.getElementById('ai2');
analogInputCh[2] = document.getElementById('ai3');
var sensorType = new Array(3);
sensorType[0] = document.getElementById('sensorType1');
sensorType[1] = document.getElementById('sensorType2');
sensorType[2] = document.getElementById('sensorType3');
var sensor = new Array(3);
sensor[0] = document.getElementById('sensor1');
sensor[1] = document.getElementById('sensor2');
sensor[2] = document.getElementById('sensor3');
for(i = 0; i < analogInputCh.length; i++){
if(analogInputCh[i].checked){
var iTemp = i + 1;
stCodegenerated += "Ain_Conf(" + iTemp + ", " + sensorType[i] + ", AI_0" + iTemp + "); "
+ sensor[i] + " := AI_0" + iTemp + ";" + "<br><br>";
}
}
document.getElementById("generatedCode").innerHTML = stCodegenerated;
}
DEMO:http://jsfiddle.net/XB63m/
如果您需要元素的值,請使用'.value'獲取值 – Ian