我使用下面的javascript代码中查找的字符串中出现的所有的UIWebView:如何在UIWebView中突出显示第一次出现的字符串?
UIWebViewSearch.js:
var uiWebview_SearchResultCount = 0;
/*!
@method uiWebview_HighlightAllOccurencesOfStringForElement
@abstract // helper function, recursively searches in elements and their child nodes
@discussion // helper function, recursively searches in elements and their child nodes
element - HTML elements
keyword - string to search
*/
function uiWebview_HighlightAllOccurencesOfStringForElement(element,keyword) {
if (element) {
if (element.nodeType == 3) { // Text node
var count = 0;
var elementTmp = element;
while (true) {
var value = elementTmp.nodeValue; // Search for keyword in text node
var idx = value.toLowerCase().indexOf(keyword);
if (idx < 0) break;
count++;
elementTmp = document.createTextNode(value.substr(idx+keyword.length));
}
uiWebview_SearchResultCount += count;
var index = uiWebview_SearchResultCount;
while (true) {
var value = element.nodeValue; // Search for keyword in text node
var idx = value.toLowerCase().indexOf(keyword);
if (idx < 0) break; // not found, abort
//we create a SPAN element for every parts of matched keywords
var span = document.createElement("span");
var text = document.createTextNode(value.substr(idx,keyword.length));
span.appendChild(text);
span.setAttribute("class","uiWebviewHighlight");
span.style.backgroundColor="yellow";
span.style.color="black";
index--;
span.setAttribute("id", "SEARCH WORD"+(index));
//span.setAttribute("id", "SEARCH WORD"+uiWebview_SearchResultCount);
//element.parentNode.setAttribute("id", "SEARCH WORD"+uiWebview_SearchResultCount);
//uiWebview_SearchResultCount++; // update the counter
text = document.createTextNode(value.substr(idx+keyword.length));
element.deleteData(idx, value.length - idx);
var next = element.nextSibling;
//alert(element.parentNode);
element.parentNode.insertBefore(span, next);
element.parentNode.insertBefore(text, next);
element = text;
}
} else if (element.nodeType == 1) { // Element node
if (element.style.display != "none" && element.nodeName.toLowerCase() != 'select') {
for (var i=element.childNodes.length-1; i>=0; i--) {
uiWebview_HighlightAllOccurencesOfStringForElement(element.childNodes[i],keyword);
}
}
}
}
}
// the main entry point to start the search
function uiWebview_HighlightAllOccurencesOfString(keyword) {
uiWebview_RemoveAllHighlights();
uiWebview_HighlightAllOccurencesOfStringForElement(document.body, keyword.toLowerCase());
}
// helper function, recursively removes the highlights in elements and their childs
function uiWebview_RemoveAllHighlightsForElement(element) {
if (element) {
if (element.nodeType == 1) {
if (element.getAttribute("class") == "uiWebviewHighlight") {
var text = element.removeChild(element.firstChild);
element.parentNode.insertBefore(text,element);
element.parentNode.removeChild(element);
return true;
} else {
var normalize = false;
for (var i=element.childNodes.length-1; i>=0; i--) {
if (uiWebview_RemoveAllHighlightsForElement(element.childNodes[i])) {
normalize = true;
}
}
if (normalize) {
element.normalize();
}
}
}
}
return false;
}
// the main entry point to remove the highlights
function uiWebview_RemoveAllHighlights() {
uiWebview_SearchResultCount = 0;
uiWebview_RemoveAllHighlightsForElement(document.body);
}
function uiWebview_ScrollTo(idx) {
var scrollTo = document.getElementById("SEARCH WORD" + idx);
if (scrollTo) scrollTo.scrollIntoView();
}
而且在我ViewController.swift文件,我加载javascript文件并执行搜索像这样:
func highlightAllOccurencesOfString(str:String) -> Int {
let path = Bundle.main.path(forResource: "UIWebViewSearch", ofType: "js")
var jsCode = ""
do{
jsCode = try String(contentsOfFile: path!)
myWebView.stringByEvaluatingJavaScript(from: jsCode)
let startSearch = "uiWebview_HighlightAllOccurencesOfString('\(str)')"
myWebView.stringByEvaluatingJavaScript(from: startSearch)
let result = myWebView.stringByEvaluatingJavaScript(from: "uiWebview_SearchResultCount")!
}catch
{
// do something
}
return Int(result)!
}
这发现并突出显示在web视图中的字符串的所有事件,但我只想要第一个突出显示。 例如,使用此代码时,我打电话:
highlightAllOccurencesOfString(str:"Hello")
的“你好”,在网页视图被突出显示所有实例:
Hello
弗兰克,Hello
诺亚
但我想这个结果:
Hello
Frank,Hello Noah
如何修改jav ascript代码只突出搜索字符串的第一个出现?
更新:我试过JonLuca的答案,但没有突出显示。
任何帮助,将不胜感激
谢谢,但不幸的是,你的代码没有工作。没有被突出显示:(你现在可以测试它吗? – Gyankus
@JonLuca,我也在寻找一个解决方案。我试过你的代码,但它没有工作。你能建议任何其他解决方案吗? –