153 lines
4.2 KiB
JavaScript
153 lines
4.2 KiB
JavaScript
/**
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* Text selection related functions.
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*/
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/**
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* selection prototype
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*
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* Object that capsulates the selection in a textarea. Returned by DWgetSelection.
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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function selection_class(){
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this.start = 0;
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this.end = 0;
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this.obj = null;
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this.scroll = 0;
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this.fix = 0;
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this.getLength = function(){
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return this.end - this.start;
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};
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this.getText = function(){
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return (!this.obj) ? '' : this.obj.value.substring(this.start,this.end);
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};
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}
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/**
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* Get current selection/cursor position in a given textArea
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*
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* @link http://groups.drupal.org/node/1210
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* @author Andreas Gohr <andi@splitbrain.org>
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* @link http://linebyline.blogspot.com/2006/11/textarea-cursor-position-in-internet.html
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* @returns object - a selection object
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*/
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function DWgetSelection(textArea) {
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var sel = new selection_class();
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textArea.focus();
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sel.obj = textArea;
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sel.start = textArea.selectionStart;
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sel.end = textArea.selectionEnd;
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sel.scroll = textArea.scrollTop;
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return sel;
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}
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/**
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* Set the selection
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*
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* You need to get a selection object via DWgetSelection() first, then modify the
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* start and end properties and pass it back to this function.
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*
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* @link http://groups.drupal.org/node/1210
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* @author Andreas Gohr <andi@splitbrain.org>
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* @param {selection_class} selection a selection object as returned by DWgetSelection()
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*/
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function DWsetSelection(selection){
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selection.obj.setSelectionRange(selection.start, selection.end);
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if(selection.scroll) selection.obj.scrollTop = selection.scroll;
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}
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/**
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* Inserts the given text at the current cursor position or replaces the current
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* selection
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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* @param {string} text the new text to be pasted
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* @param {selection_class} selection selection object returned by DWgetSelection
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* @param {int} opts.startofs number of charcters at the start to skip from new selection
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* @param {int} opts.endofs number of characters at the end to skip from new selection
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* @param {boolean} opts.nosel set true if new text should not be selected
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*/
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function pasteText(selection,text,opts){
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if(!opts) opts = {};
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// replace the content
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selection.obj.value =
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selection.obj.value.substring(0, selection.start) + text +
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selection.obj.value.substring(selection.end, selection.obj.value.length);
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// set new selection
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if (is_opera) {
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// Opera replaces \n by \r\n when inserting text.
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selection.end = selection.start + text.replace(/\r?\n/g, '\r\n').length;
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} else {
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selection.end = selection.start + text.length;
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}
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// modify the new selection if wanted
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if(opts.startofs) selection.start += opts.startofs;
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if(opts.endofs) selection.end -= opts.endofs;
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// no selection wanted? set cursor to end position
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if(opts.nosel) selection.start = selection.end;
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DWsetSelection(selection);
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}
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/**
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* Format selection
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*
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* Apply tagOpen/tagClose to selection in textarea, use sampleText instead
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* of selection if there is none.
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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function insertTags(textAreaID, tagOpen, tagClose, sampleText){
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var txtarea = jQuery('#' + textAreaID)[0];
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var selection = DWgetSelection(txtarea);
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var text = selection.getText();
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var opts;
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// don't include trailing space in selection
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if(text.charAt(text.length - 1) == ' '){
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selection.end--;
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text = selection.getText();
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}
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if(!text){
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// nothing selected, use the sample text and select it
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text = sampleText;
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opts = {
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startofs: tagOpen.length,
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endofs: tagClose.length
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};
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}else{
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// place cursor at the end
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opts = {
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nosel: true
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};
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}
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// surround with tags
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text = tagOpen + text + tagClose;
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// do it
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pasteText(selection,text,opts);
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}
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/**
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* Wraps around pasteText() for backward compatibility
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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function insertAtCarret(textAreaID, text){
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var txtarea = jQuery('#' + textAreaID)[0];
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var selection = DWgetSelection(txtarea);
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pasteText(selection,text,{nosel: true});
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}
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