使用javascript在textarea中選擇之前和之后插入文本

Question

如何使用javascript在textarea中選擇之前和之后插入文本？ 選擇發生在HTML表單的textarea字段中

Answer 1

適用於IE，MFF和GC的簡單腳本，其中myField是對象引用。 由通過網絡找到的幾個腳本組裝而成。

function insertAtCursor(myField, myValueBefore, myValueAfter) {

    if (document.selection) {

        myField.focus();
        document.selection.createRange().text = myValueBefore + document.selection.createRange().text + myValueAfter;


    } else if (myField.selectionStart || myField.selectionStart == '0') {

        var startPos = myField.selectionStart;
        var endPos = myField.selectionEnd;
        myField.value = myField.value.substring(0, startPos)+ myValueBefore+ myField.value.substring(startPos, endPos)+ myValueAfter+ myField.value.substring(endPos, myField.value.length);

    } 
}

Answer 2

請嘗試以下操作：

var selectionText = yourTextarea.value.substr(yourTextarea.selectionStart, yourTextarea.selectionEnd);
yourTextarea.value = "Text before" + selectionText + "Text after";

如果要搜索+替換，則以下代碼可以解決問題（在非IE瀏覽器中）

var textBeforeSelection = yourTextarea.value.substr(0, yourTextarea.selectionStart);
var textAfterSelection = yourTextarea.value.substr(yourTextarea.selectionEnd, yourTextarea.value.length);
yourTextarea.value = textBeforeSelection + " new selection text " + textAfterSelection;