[英]How can I clear a text box of enter or newline (html / javascript)?
[英]Enter NewLine with JS in HTML
我有3個輸入:
<input type="text" id="id-1">
<input type="text" id="id-2">
<input type="text" id="id-3">
我有一個調用函數的按鈕:
<button onclick="myfunction()">click me</button>
這是被調用的JS函數,它獲取所有輸入的值並在文本區域中顯示整個值:
function myfunction() { var x = "MyText1: " + document.getElementById("id-1").value + "MyText2: " + document.getElementById("id-2").value + "MyText3: " + document.getElementById("id-1").value; document.getElementById("mytext").innerHTML = x; }
這是函數顯示輸入字段文本的區域:
<textarea id="mytext"></textarea>
到現在為止還挺好。 文本區域如下所示:
"MyText1: input of id-1" "MyText2: input of id-2" "MyText3: input of id-3"
我想要實現的是以下輸出:
"MyText1: input of id-1"
"MyText2: input of id-2"
"MyText3: input of id-3"
我的問題是,當我添加document.write("\\n");
到腳本,頁面崩潰並顯示以下控制台文本: Uncaught TypeError: Cannot read property 'value' of null
。
這里是一個沒有換行符的工作演示: https : //jsfiddle.net/6nw8jrk9/
像這樣構建字符串x
時,可以在每行末尾添加換行符( \\n
):
var x =
"MyText1: " + document.getElementById("id-1").value + '\n' +
"MyText2: " + document.getElementById("id-2").value + '\n' +
"MyText3: " + document.getElementById("id-1").value;
請參見下面的工作示例:
function myfunction() { var x = "MyText1: " + document.getElementById("id-1").value + '\\n' + "MyText2: " + document.getElementById("id-2").value + '\\n' + "MyText3: " + document.getElementById("id-1").value; document.getElementById("mytext").innerHTML = x; }
<input type="text" id="id-1"> <input type="text" id="id-2"> <input type="text" id="id-3"> <br /> <textarea id="mytext"></textarea> <button onclick="myfunction()">click me</button>
另外,您可以使用ES6的模板文字 :
function myfunction() { var x = `MyText1: ${ document.getElementById("id-1").value} MyText2: ${document.getElementById("id-2").value} MyText3: ${document.getElementById("id-1").value}`; document.getElementById("mytext").innerHTML = x; }
<input type="text" id="id-1"> <input type="text" id="id-2"> <input type="text" id="id-3"> <br /> <textarea id="mytext"></textarea> <button onclick="myfunction()">click me</button>
您應該在每個輸入值后附加\\n
。
<script>
function myfunction() {
var x =
"MyText1: " + document.getElementById("id-1").value + '\n' +
"MyText2: " + document.getElementById("id-2").value + '\n' +
"MyText3: " + document.getElementById("id-1").value;
document.getElementById("mytext").innerHTML = x;
}
</script>
您可以在var x
添加換行符
var x =
"MyText1: " + document.getElementById("id-1").value + '\n' +
"MyText2: " + document.getElementById("id-2").value + '\n' +
"MyText3: " + document.getElementById("id-1").value;
您可以使用\\n
或HTML實體
將行分成文本區域
var x = "MyText1: " + "valueInput" + "\\n" + "MyText2: " + "valueInput" + " " + "MyText3: " + "valueInput"; document.getElementById("mytext").innerHTML = x;
<textarea id="mytext"></textarea>
使用document.getElementById("mytext").value = x;
例如:
<input type="text" id="id-1" value="aa" /> <input type="text" id="id-2" value="bb" /> <input type="text" id="id-3" value="cc" /> <textarea id="mytext"></textarea> <button onclick="myfunction()">click me</button> <script> function myfunction() { var x = "MyText1: " + document.getElementById("id-1").value + "\\nMyText2: " + document.getElementById("id-2").value + "\\nMyText3: " + document.getElementById("id-3").value; document.getElementById("mytext").value = x; } </script>
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