Tech Tip: Loading JQuery in a Web Area
PRODUCT: 4D | VERSION: 17 | PLATFORM: Mac & Win
Published On: January 10, 2019
To execute JavaScript expressions in a Web Area, the commands like WA Evaluate JavaScript and WA EXECUTE JAVASCRIPT FUNCTION are very handy in working with loaded web pages in the Web Area. To take it a step futher with calling more JavaScript with these 4D commands, the following method can load JQuery in the Web Area:
| // ---------------------------------------------------------------------- // Name: LOAD_JQUERY_IN_WEBAREA // Description: Method will load JQuery library in a given Web Area // // Parameters: // $1 (TEXT) - JQuery version in text (e.g. 2.2.1) // $2 (POINTER) - Web Area form object pointer // Output: // $0 (LONGINT) - Status of loading in the Web Area // 0 - Success // 1 - JQuery version was not found // 2 - Web Area was not loaded with a URL // 3 - JQuery does not match library specified // 4 - No JQuery loaded // ---------------------------------------------------------------------- C_TEXT($1;$jQVersion;$jQversionR;$jQText;$url) C_POINTER($2;$webArea) C_LONGINT($0;$status;$response) If (Count parameters=2) $jQVersion:=$1 $webArea:=$2 $content:=WA Get page content($webArea->) If ($content="") $status:=2 // Web Area URL was not loaded Else $url:="https://code.jquery.com/jquery-"+$jQVersion+".min.js" $response:=HTTP Get($url;$jQText) If ($response=200) WA Evaluate JavaScript($webArea->;$jQText) $jQversionR:=WA Evaluate JavaScript($webArea->;"jQuery().jquery") If ($jQversion=$jQversionR) $status:=0 // Success Else If ($jQversionR="") $status:=4 // No JQuery Loaded Else $status:=3 // Not the correct Jquery version End if End if Else $status:=1 // JQuery was not extracted End if End if $0:=$status End if |
Here is an example of loading JQuery 3.3.1 into the Web Area:
| C_LONGINT($status) $status:=LOAD_JQUERY_IN_WEBAREA ("3.3.1";->WebArea) |
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