[英]How to split one text area into two textareas?
我已將兩個text-area值串聯到一個text-area值中。 現在,當我單擊“還原”按鈕時,我想將文本區域拆分為舊的兩個文本區域。 html查看圖像和下面給出的代碼:
HTML:
<div class="container">
<h3 class="text-center text-primary">TextArea Concatenate and Revert</h3>
<div class="row">
<div class="col-md-5">
<div class="row">
<div class="col-md-12">
<textarea rows="4" cols="50" id="text_area_1"></textarea>
</div>
</div>
<div class="row">
<div class="col-md-12">
<textarea rows="4" cols="50" id="text_area_2"></textarea>
</div>
</div>
<button type="button" class="btn btn-success" onclick="concatenate()">Concatenate</button>
</div>
<div class="col-md-5">
<textarea rows="8" cols="100" id="text_area_3"></textarea>
<input type="submit" class="btn btn-warning" value="Revert">
</div>
</div>
</div>
Javascript:
<script>
function concatenate(){
document.getElementById("text_area_3").value =
document.getElementById("text_area_1").value + " " +
document.getElementById("text_area_2").value;
}
</script>
您可能應該使用分隔符,以便可以將值分割回文本區域。
<script>
var one = document.getElementById("text_area_1");
var two = document.getElementById("text_area_2");
var three = document.getElementById("text_area_3");
function concatenate(){
three.value = one.value + ":" + two.value;
one.value = "";
two.value = "";
}
function revert(){
var val = three.value.split(":");
one.value = val[0];
two.value = val[1];
three.value = "";
}
</script>
請參閱我創建的示例: https : //jsfiddle.net/ft05wyxt/
使用長度,您可以執行以下操作
var textbox1="testt ttets tetstend__";
var textbox2="my second textbox2";
//added a space between;
var mergedTextbox=textbox1+' '+textbox2;
console.log(textbox1.length,textbox2.length,mergedTextbox.length);
var splited1=mergedTextbox.substr(0,textbox1.length);
var splited2=mergedTextbox.substr((textbox1.length+1),textbox2.length);
console.log(splited1,splited2)
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