[英]How to display an array value based on a selection from a select option box?
<!DOCTYPE html>
<html>
<body bgcolor="#999966">
<select id="myFruitSelect">
<option value="0"> Please Choose a Fruit </option>
<option value="1"> Apple</option>
<option value="2">Orange</option>
<option value="3">Pineapple</option>
<option value="4">Banana</option>
<option value="5"> Watermelon </option>
</select>
</form>
<br>
<button onclick="myFunction()"> Select Your Fruit</button>
<img id="outputImage" src=""/>
<script>
function myFunction() {
var n =parseInt(x) -1;
var pictures=[ "apple.png", "orange.png", "pineapple.png", "banana.png", "Watermelon.png"];
var x = document.getElementById("myFruitSelect").value;
document.getElementById('outputImage').src = pictures[n-1];
}
</script>
</body>
</html>
任何幫助或正確方向的點是值得贊賞的
我正在嘗試創建一個用戶從下拉列表中選擇一個選項的頁面,然后根據用戶的選擇顯示一個數組值。 我無法弄清楚如何根據用戶選擇訪問數組值。 我只能使用HTML和腳本,所以沒有jQuery的答案。
這行似乎有問題( var n =parseInt(x) -1;
),因為在定義它之前使用x
。 您可以將該聲明移到var x
聲明下面,或者完全刪除它:
<!DOCTYPE html> <html> <body bgcolor="#999966"> <select id="myFruitSelect"> <option value="0"> Please Choose a Fruit </option> <option value="1"> Apple</option> <option value="2">Orange</option> <option value="3">Pineapple</option> <option value="4">Banana</option> <option value="5"> Watermelon </option> </select> </form> <br> <button onclick="myFunction()"> Select Your Fruit</button> <img id="outputImage" src=""/> <script> function myFunction() { var pictures= [ "apple.png", "orange.png", "pineapple.png", "banana.png", "Watermelon.png"]; var x = document.getElementById("myFruitSelect").value; document.getElementById('outputImage').src = pictures[parseInt(x, 10)-1]; } </script> </body> </html>
這很少見,顯然你的代碼還可以,但是你給你的圖像元素的id和你document.getElementById
的id有區別.getElementById對我來說似乎都是一樣的但是當我從圖像中復制並粘貼id時document.getElementById()
它完美無缺。
<!DOCTYPE html>
<html>
<body bgcolor="#999966">
<form>
<select id="myFruitSelect">
<option value="0"> Please Choose a Fruit </option>
<option value="1"> Apple</option>
<option value="2">Orange</option>
<option value="3">Pineapple</option>
<option value="4">Banana</option>
<option value="5"> Watermelon </option>
</select>
</form>
<br>
<button onclick="myFunction()"> Select Your Fruit</button>
<img id="outputImage" src=""/>
<script>
function myFunction() {
var pictures=[ "apple.png", "orange.png", "pineapple.png", "banana.png", "Watermelon.png"];
x = document.getElementById("myFruitSelect").value;
//This will give you index of the selected option.
//As the array starts from 0 , we need to subtract 1 to access the particular picture
y = parseInt(x);
m = y-1;
console.log(pictures[m]);
document.getElementById('outputImage').setAttribute("src", pictures[m]);
}
</script>
</body>
</html>
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